Journal of Materials Processing Technology最新文献

{"title":"Tailoring the microstructure and mechanical properties of laser metal deposited Hastelloy X superalloy via heat treatment and subsequent hot plastic deformation","authors":"Zhubin He ,&nbsp;Jiangkai Liang ,&nbsp;Xianggang Ruan ,&nbsp;Xuezhi Wang ,&nbsp;Jian Ning ,&nbsp;Quan Gao ,&nbsp;Enyu Guo ,&nbsp;Wei Du","doi":"10.1016/j.jmatprotec.2024.118678","DOIUrl":"10.1016/j.jmatprotec.2024.118678","url":null,"abstract":"<div><div>The laser metal deposition technology, characterized by its inherent rapid cooling rate and high thermal gradient, poses significant challenges in fabricating large-scale, complex thin-walled Hastelloy X components that necessitate precise dimensional accuracy and structural integrity. To tackle this issue, a novel compound forming process is proposed, wherein a near-net-shaped preform is produced using laser metal deposition technology, followed by shape and properties regulation through the hot metal gas forming process. This investigation systematically explores the hot formability, pre-deformed microstructure and properties of Hastelloy X superalloy sheets fabricated through laser metal deposition, aiming to identify optimized process parameters and to validate the feasibility of this advanced forming process. Results indicate that: (1) The laser metal deposited Hastelloy X superalloy, subjected to solution and aging heat treatments, demonstrates remarkable microstructural integrity and exceptional hot formability, attributed to its pronounced overall crystalline texture and minimal dislocation density. (2) The optimal processing domain was established within a temperature range of 900 °C to 1000 °C and a strain rate of 0.001 s⁻¹, as derived from hot processing maps based on dynamic material model. (3) Pre-deformation at 950 °C facilitates uniform and stable precipitation of nanoscale M₂₃C₆ carbides and the formation of a high-density dislocation network, significantly enhancing strength. Overall, through appropriate heat treatment and subsequent hot plastic deformation, the microstructure of Hastelloy X superalloy was optimized, yielding exceptional mechanical properties at both room and elevated temperatures. The feasibility of forming laser metal deposited preforms using the hot metal gas forming process was confirmed, laying a foundation for the future application of this innovative process. The methodologies and insights derived from this research are particularly relevant to the fabrication of large-sized, complex thin-walled components, especially within demanding aerospace applications and next-generation transportation systems.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"336 ","pages":"Article 118678"},"PeriodicalIF":6.7,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tailored microstructure and enhanced high temperature behavior of TiC/Inconel 718 composites through dual-gradient printing strategy in direct energy deposition","authors":"Wenbo Liu ,&nbsp;Bin Zou ,&nbsp;Xinfeng Wang ,&nbsp;Shouling Ding ,&nbsp;Jikai Liu ,&nbsp;Lei Li ,&nbsp;Chuanzhen Huang ,&nbsp;Peng Yao","doi":"10.1016/j.jmatprotec.2024.118679","DOIUrl":"10.1016/j.jmatprotec.2024.118679","url":null,"abstract":"<div><div>The mismatch between the content of ceramics and laser power can lead to defects such as pores, microcracks, and grain coarsening, which resulted in the contradiction between tensile strength, ductility, and high-temperature behavior of TiC/superalloy composites. In this study, control methods for the microstructure evolution of TiC/Inconel 718 composites were investigated through dual-gradient printing strategy in direct energy deposition. Results indicated that this strategy, which involved a gradual increase in laser power and TiC addition amount in direct energy deposition processing, facilitated the transformation of Inconel 718–5 wt%TiC dual-gradient materials from columnar crystals to equiaxed crystals and the formation of carbides. This strategy effectively increased the number of heterogeneous nucleation points and solidification rate, while reducing temperature gradients, thereby forming a gradient-evolved microstructure. A significant amount of intragranular and intergranular carbides of the dual-gradient materials has enhanced stability of grains and grain boundaries at both room temperature and high temperature. Meanwhile, the internal fine equiaxed grains and carbides of Inconel 718–5 wt%TiC dual-gradient materials provided greater toughness. Inconel 718–5 wt%TiC dual-gradient materials exhibits a room temperature tensile strength of 859 MPa and an elongation of 18.2 %, along with a high temperature tensile strength of 746 MPa and a unit area oxidation weight gain of 0.5 mg/cm². The dual-gradient printing strategy has addressed the contradiction between high tensile strength, low ductility, and high-temperature performance of TiC/Inconel 718 composites.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"336 ","pages":"Article 118679"},"PeriodicalIF":6.7,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fabrication of micro holes with confined pitting corrosion by laser and electrochemical machining: Pitting corrosion formation mechanisms and protection method","authors":"Jian Yang ,&nbsp;Yufeng Wang ,&nbsp;Yong Yang ,&nbsp;Yunfeng Liu ,&nbsp;Wenwu Zhang","doi":"10.1016/j.jmatprotec.2024.118677","DOIUrl":"10.1016/j.jmatprotec.2024.118677","url":null,"abstract":"<div><div>Laser and electrochemical hybrid machining (LECM) combines the advantages of high efficiency of laser processing and high surface quality of electrochemical machining and has been employed to process deep micro holes with high surface quality, high precision, and efficiency. However, surface pitting corrosion occurs around the entrance of the micro holes drilled by LECM, which deteriorates their surface quality and mechanical properties. This study revealed the mechanism of surface pitting corrosion formation mechanisms during LECM by characterizing surface micromorphology, chemical composition, microstructures, and surface stress. The difference between surface pitting corrosion area during LECM and the stray current corrosion during electrochemical machining was studied. Micro solid metal particles and inner microcavities were observed in micro pits. The depth of the micro pits was greater than that obtained using electrochemical machining. It has been concluded that in LECM, the surface pitting corrosion occurred owing to the enhanced stray current corrosion and the accumulation of solidified melt particles and cavitation microbubbles in the micro pits. Coaxial gas-assisted LECM was also proposed to restrict the surface pitting corrosion area. Experiments and simulations were conducted to verify the feasibility of minimizing the corrosion area using coaxial gas. The surface pitting corrosion area has been decreased by 85.1 % at a coaxial gas pressure of 0.1 MPa compared with that without coaxial gas assistance. Finally, the radial cooling holes with a diameter of 1.2 mm and an aspect ratio of 125:1 in turbine blades with high surface quality were fabricated. This study provides a promising method to fabricate high-aspect-ratio micro-holes with high surface quality and high efficiency.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"335 ","pages":"Article 118677"},"PeriodicalIF":6.7,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Online pre-perception of forming state based on real-time measurement in spinning of thin-walled shell component","authors":"Xinggang Yan,&nbsp;Pengfei Gao,&nbsp;Mei Zhan,&nbsp;Xinshun Li,&nbsp;Han Zhang","doi":"10.1016/j.jmatprotec.2024.118676","DOIUrl":"10.1016/j.jmatprotec.2024.118676","url":null,"abstract":"<div><div>Die-less spinning is an advance incremental forming process widely used for the manufacturing of thin-walled shell components. During the spinning, workpiece shape and forming state both change continuously, and the influence of process parameters on the forming results is also time-varying, which make it difficult to control the forming quality. To this end, this work develops a real-time measurement system and an online pre-perception method to provide technical support for dynamic control of the spinning process. Specifically, the real-time measurement system is constructed firstly by placing two laser profilers bilaterally at two sides of the workpiece. Based on the measuring data of two laser profilers, the profile data of workpiece cross-section is obtained by coordinate transformation, data denoising and correcting the error caused by inclined workpiece surface. Then, an algorithm is proposed to identify the critical geometric parameters (flange width, roller action radius, wall thickness and flange fluctuation degree) of workpiece shape from the profile data. In contrast to the measurement results by a three-coordinate measuring machine, the developed system presents a real-time measurement error less than 4 %. Moreover, an online pre-perception method of wall thickness and wrinkling defect is developed based on the real-time measured workpiece shape parameters. The online pre-perception of wall thickness and wrinkling defect presents high accuracy with the relative error less than 2.1 %. The above results indicate both the workpiece dimensions and spinning state can be well real-time measured and online pre-perceived, which can provide important foundation for the study of time-varying influence and dynamic control of the spinning process.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"336 ","pages":"Article 118676"},"PeriodicalIF":6.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An efficient high-quality cutting method for thick SiCf/SiC ceramic matrix composites using UV laser multiline layered scanning with focus increment optimization","authors":"Zhiwei Xu ,&nbsp;Yuanyuan Jiang ,&nbsp;Jinxuan Bai ,&nbsp;Linmao Qian","doi":"10.1016/j.jmatprotec.2024.118674","DOIUrl":"10.1016/j.jmatprotec.2024.118674","url":null,"abstract":"<div><div>Laser-layered scanning techniques have achieved considerable success in cutting and drilling applications. However, their effectiveness in processing SiC_f/SiC ceramic matrix composites—critical materials for next-generation aerospace thermal components—remains less than optimal. This study addresses the challenge of enhancing the quality and efficiency of cutting thick samples by being the first to highlight the crucial influence of focus increment adjustments in the laser-layered scanning process. Specifically, it examines the relationship between the predetermined laser focus drop per layer and the actual ablation depth achieved. Systematic analysis explores the impact of focus increment adjustments on both the macroscopic structural alterations during cutting and the microstructural characteristics of the cut surfaces. The findings demonstrate that the UV nanosecond laser multi-line layered scanning technique is particularly effective for processing thick SiC_f/SiC samples, achieving a surface area of 5 × 5 mm² (Sa 366.92 nm) in just 117.58 s. By optimising the focus increment, a high and stable material removal rate is maintained throughout the process, reducing surface oxidation, minimising the formation of a recast layer, and reducing fibre interface debonding. Additionally, the study reveals the mechanism behind the formation of surface taper and presents a method to achieve a taper-free surface by adjusting the laser incidence angle. These findings provide valuable insights for the rapid and high-quality machining of matrix composites, offering significant improvements over existing methods.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"335 ","pages":"Article 118674"},"PeriodicalIF":6.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142722602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Cu/Ni coating on microstructure and mechanical properties in steel/aluminum single-sided resistance spot welding joint","authors":"Gang Wang,&nbsp;Kang Zhou,&nbsp;Baokai Ren,&nbsp;Wenxiao Yu","doi":"10.1016/j.jmatprotec.2024.118675","DOIUrl":"10.1016/j.jmatprotec.2024.118675","url":null,"abstract":"<div><div>Due to significant differences in physical and chemical properties between aluminum and steel, directly joining them using traditional resistance spot welding (RSW) process often cannot achieve satisfactory high-quality joints. In this work, some key factors influencing the quality of steel/aluminum welded joints were analyzed and a method based on fracture mechanism analysis was proposed aiming to improve the strength of steel/aluminum joints. The proposed method utilized a copper/nickel bimetallic coating on the steel surfaces, which was joined with aluminum alloy through single-sided RSW. This approach effectively addressed severe deformation of aluminum alloy and reduced stress cracks caused by residual stress in joints. Furthermore, the influence of coating on the microstructure and mechanical properties of steel/aluminum interface was further investigated. Experimental results showed the coating participated in interfacial metallurgical reactions, mainly forming intermetallic compounds (IMCs) such as Ni‍‍-Al, Fe-Cu, Cu-Al, and Fe-Ni, which mixed with Fe-Al compounds. Additionally, the coating refined the IMC grain size, resulting in smaller grains compared to Fe₂Al₅, the primary IMC in uncoated joints. Moreover, the coating reduced IMC layer thickness to within 2.0‍ μm at the weld center, and increased thinner IMC layer thickness by 0.4 μm at the weld periphery. This implied that the coating inhibited the mutual diffusion of Fe and Al atoms, preventing the formation of Fe-Al compounds and promoting a more uniform IMC layer thickness. Microhardness and tensile tests indicated that the coating reduced the hardness gradient of steel/aluminum interface, and increased IMC layer toughness and strength, improving the overall mechanical properties of the joints. The coated steel/aluminum joints with button fracture achieved a peak load of 6.7 kN and an average tensile-shear strength of 127.5 MPa, representing a 49.3 % increase in strength compared to uncoated steel/aluminum joints. This work will provide theoretical insights for steel/aluminum RSW and promote academic and practical engineering applications.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"335 ","pages":"Article 118675"},"PeriodicalIF":6.7,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142722601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multimodal experimental and numerical evaluation of Residual Stress in AA6082-T6 Friction Stir Welding pipe girths","authors":"Alessandro Tognan ,&nbsp;Noel Sheshi ,&nbsp;Emanuele Vaglio ,&nbsp;Vladimir Luzin ,&nbsp;Daniel Hattingh ,&nbsp;Enrico Salvati","doi":"10.1016/j.jmatprotec.2024.118665","DOIUrl":"10.1016/j.jmatprotec.2024.118665","url":null,"abstract":"<div><div>Although Residual Stress (RS) induced by Friction Stir Welding (FSW) has been widely investigated for planar weldments, the same attention has not been paid as far as the curved variant is concerned. To comprehensively address this gap, the present paper studies the RS in three AA6082-T6 FSW pipes (37.5 mm outer diameter <span><math><mo>×</mo></math></span> 3 mm thickness) manufactured with varying feed speeds, i.e. 50, 75, 100<!--> <!-->mm/min. RS evaluations were cross-validated by two independent experimental methods, i.e. Neutron Diffraction and Contour Method. A novel multi-physics Finite Element (FE) model was implemented and calibrated using the previously obtained experimental outcomes to shed light on the key physical mechanism responsible for the arising of RS. The analysis unveiled M-like hoop RS patterns akin to flat FSW butt-welds but having lower magnitudes ranging from −20 MPa to 65 MPa, most likely due to the different thermal histories. The axial RS oscillates between -20 MPa and 20 MPa, whereas the radial component turned out to negligible. The FE model also demonstrated how feed speed, plunge force, and external clamping conditions alter RS magnitude while identifying 75<!--> <!-->mm/min as the optimal speed that minimises the peak hoop RS to 40<!--> <!-->MPa.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"335 ","pages":"Article 118665"},"PeriodicalIF":6.7,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Single-crystal structure formation in laser directed energy deposited Inconel 718 through process parameter optimization and substrate orientation tuning","authors":"Zuo Li ,&nbsp;Xin Lin ,&nbsp;Shang Sui ,&nbsp;Xuan Zhao ,&nbsp;Bo Yao ,&nbsp;Chongliang Zhong ,&nbsp;Andres Gasser ,&nbsp;Hua Tan","doi":"10.1016/j.jmatprotec.2024.118673","DOIUrl":"10.1016/j.jmatprotec.2024.118673","url":null,"abstract":"<div><div>A transverse grain boundary perpendicular to the applied loading direction is normally considered a main reason for the deterioration of the mechanical properties of nickel-based superalloys at high temperatures. Therefore, reducing or even eliminating these types of grain boundaries can effectively delay failure and improve high-temperature mechanical properties. In this study, the feasibility of process parameter optimization and substrate rotation was explored for fabricating single-crystal Inconel 718 specimens during laser directed energy deposition (LDED). The study determined that optimizing the process parameters was dependent on the ability to enlarge the [001] region at the bottom of the melt pool as much as possible. Simultaneously, ensuring that the remelting depth exceeded the stray grain region height at the top of the melt pool was necessary. Therefore, that the stray grains can be fully erased during the subsequent deposition process. Accordingly, an Inconel 718 single-walled specimen (height: 20 mm) with a full single-crystal structure was successfully fabricated using LDED for the first time. However, this approach remains insufficient for fabricating a block with a single-crystal structure, as SGs appear readily in the overlapping regions. Substrate rotation was further considered, where ensuring that one side of the melt pool was in the [001]-grain region was critical. Although the other side of the melt pool featured SGs, they were eliminated through the following overlapping process, as the SG region in the current melt pool corresponded to the [001]-grain region in the next melt pool. Through these two approaches, a small-format single-crystal block with dimensions of 27 × 8.3 × 1.3 mm (length × width × height) was successfully fabricated. Because the Inconel 718 superalloy is not specifically designed for single-crystal structure generation, a large-format block with a single-crystal structure still cannot be fabricated using these approaches. Nevertheless, the findings remain insightful because they demonstrate a wider range of variable microstructures achievable with additive manufacturing processes than with traditional forming processes such as casting or forging and may provide more opportunities for improving the mechanical properties. In addition, the preparation of a small-format single-crystal structure has significant applications in repairing damaged components such as aeroengine blades.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"335 ","pages":"Article 118673"},"PeriodicalIF":6.7,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Splashing effects and mechanism in water jet-guided laser processing of Cf/SiC composites","authors":"Binying Bao ,&nbsp;Guangyi Zhang ,&nbsp;Zhongan Chen ,&nbsp;Yang Chao ,&nbsp;Wenwu Zhang","doi":"10.1016/j.jmatprotec.2024.118671","DOIUrl":"10.1016/j.jmatprotec.2024.118671","url":null,"abstract":"<div><div>Water jet-guided laser (WJGL) processing of ceramic matrix composites offers smooth cutting surfaces and minimizes defects such as delamination, burrs, and recast layers. However, the processing ability of WJGL is limited by the stability of the water jet. Splashing is a critical factor that affects water jet stability. This study investigates the splashing morphology and its impact mechanism during WJGL processing of continuous carbon fiber reinforced silicon carbide (C_f/SiC) composites. High-speed cameras were used to capture splashing morphologies and laser transmission states during drilling and grooving. The results indicate that the splashing morphology was significantly affected by the water jet speed and the micro-hole/groove depth, resulting in behaviors such as water accumulation, droplets falling, rebound droplets, splash impact, water film, and mist, which distorted or even broke the water jet. The laser escaped in the distorted water jet, leading to a reduction in material removal rate. The splashing at the water jet speed of 160 m/s resulted in a 61.1 % reduction in material removal rate during drilling compared to 40 m/s. In addition, a method of placing a porous water-absorbing material on the workpiece surface was proposed, which effectively improved the material removal rate. This paper presents a theoretical basis for comprehending and addressing splashing in WJGL processing.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"335 ","pages":"Article 118671"},"PeriodicalIF":6.7,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142703775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Achieving enhanced high-temperature strength in Ti-48Al-1Fe alloy sheets by direct hot pack-rolling of powder-sintered billets without cogging","authors":"Hanlin Wang ,&nbsp;Ce Zhang ,&nbsp;Xiangyang Liu ,&nbsp;Hao Yu ,&nbsp;Rui Liu ,&nbsp;Jiazhen Zhang ,&nbsp;Xin Lu","doi":"10.1016/j.jmatprotec.2024.118669","DOIUrl":"10.1016/j.jmatprotec.2024.118669","url":null,"abstract":"<div><div>The TiAl alloy is a novel lightweight high-temperature structural material that exhibits exceptional performance. The brittleness and mechanical properties of the material can be enhanced by improving the microstructure via rolling. The Ti-48Al-1Fe alloy with high density was produced using powder compaction and pressure-less sintering. Subsequently, the TiAl alloy sheet was formed via hot pack rolling. This study examined the sheet formability of PM Ti-48Al-1Fe alloy sheets at various temperatures, as well as the microstructure and mechanical properties at varied levels of rolling deformations. The microstructure of the powder metallurgy (PM) TiAl alloy sheet has a unique duplex structure, consisting of α₂/γ lamellar colonies and a composite structure. The rolling deformation process generates spherical recrystallized grains, which effectively reduce stress concentration. The enhanced composite structure is mostly localized at the interfaces between grains, creating a robust obstacle for the movement of dislocations at high temperatures. This results in the desired outcome of reinforcing the mechanical properties of the material at high temperatures through grain boundary strengthening. This study demonstrates that the ultimate tensile strength (UTS) of PM TiAl sheet tensile specimens in the rolling direction at room temperature is 443 MPa with 1 % elongation, whereas at 800 °C, the UTS rises to 548 MPa with 2.5 % elongation. This study proposes a novel process for the efficient production of Ti48Al1Fe sheets with good high-temperature mechanical properties. This technique entails the hot rolling of high-density sintered powder metallurgy billets, offering an innovative approach for the economical and swift production of TiAl alloy sheets during practical manufacturing process.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"335 ","pages":"Article 118669"},"PeriodicalIF":6.7,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142703457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}