Journal of Materials Research and Technology-Jmr&t最新文献_第6页

Exploring microstructural characteristics and tensile behaviour in 3D-Printed polyethylene terephthalate 探索3d打印聚对苯二甲酸乙二醇酯的微观结构特征和拉伸行为

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-09-17 DOI: 10.1016/j.jmrt.2025.09.136

Lotfi Hedjazi , Sofiane Belhabib , Sofiane Guessasma

{"title":"Exploring microstructural characteristics and tensile behaviour in 3D-Printed polyethylene terephthalate","authors":"Lotfi Hedjazi , Sofiane Belhabib , Sofiane Guessasma","doi":"10.1016/j.jmrt.2025.09.136","DOIUrl":"10.1016/j.jmrt.2025.09.136","url":null,"abstract":"<div><div>This study investigates the mechanical performance, microstructural characteristics, and optimisation strategies for 3D-printed PET, focusing on the effects of printing temperature and angle. Tensile behaviour analysis reveals that while temperature variations (200–230 °C) have a minor effect, the printing angle plays a pivotal role in determining mechanical properties. Lower angles (≤15°) enhance stiffness, tensile strength, and elongation at break by minimizing porosity and improving interfilament bonding. Conversely, higher angles (θ = 30°) result in increased porosity (up to 2.1 %), leading to reduced mechanical performance. Microstructural analysis highlights the influence of filament arrangement and cohesive layering on stress distribution and mechanical integrity. Finite element simulations predict stress heterogeneity and align qualitatively with experimental results, demonstrating the significant impact of porosity and filament orientation on mechanical properties. To validate practical applicability, a bike bottle holder was successfully 3D-printed using PET. The design, occupying only 4.52 % of the design domain volume, achieved a balance between material efficiency, mechanical performance, and energy consumption, with optimal settings of a 0° printing angle and an intermediate temperature of 210 °C. These findings underscore the importance of optimizing printing parameters to enhance the structural performance and energy efficiency of 3D-printed PET components, providing valuable insights for future applications in additive manufacturing.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 1168-1184"},"PeriodicalIF":6.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120961","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}

引用次数: 0

Numerical and experimental study on the energy absorption characteristics of thin-walled auxetic cylindrical tubes with varying porosity 变孔隙率薄壁消声圆柱管吸能特性的数值与实验研究

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-09-17 DOI: 10.1016/j.jmrt.2025.09.135

Ehsan Hosseinpour , Ali Moazemi Goudarzi , Fattaneh Morshedsolouk , Hussain Gharehbaghi

{"title":"Numerical and experimental study on the energy absorption characteristics of thin-walled auxetic cylindrical tubes with varying porosity","authors":"Ehsan Hosseinpour , Ali Moazemi Goudarzi , Fattaneh Morshedsolouk , Hussain Gharehbaghi","doi":"10.1016/j.jmrt.2025.09.135","DOIUrl":"10.1016/j.jmrt.2025.09.135","url":null,"abstract":"<div><div>A numerical and experimental combined study was carried out to examine the crushing behavior and energy absorption of steel auxetic thin-walled cylindrical tubes under quasi-static axial compression. Fifteen new auxetic designs with Cylindrical Lozenge Grid (CLG), Cylindrical Square Grid (CSG), and Cylindrical Peanut Grid (CPG) patterns were created, five of which were fabricated for experiments. Validated finite element simulations examined the effect of pattern type and porosity (through cell rib thickness) on Specific Energy Absorption (SEA), Peak Crushing Force (PCF), Mean Crushing Force (MCF), and Crush Load Efficiency (CLE). The \"auxetic effective crushing length\" was defined to measure the optimal deformation before cylindrical buckling. In this stage, CLE was 80–100 % while SEA was low (0.5–1.5 J/g). Complete crushing up to 60 mm displacement raised SEA to approximately 6 J/g but reduced CLE to 20–60 %. Reduced porosity increased SEA, PCF, and MCF but reduced the auxetic effective crushing length from approximately 33 mm (CLG-1.5) to 8 mm (CLG-3.5). Increased porosity encouraged more progressive, stable energy absorption. Pattern type and rib thickness were identified to significantly influence auxetic deformation, failure mode, and energy dissipation. These quantitative findings give insights for the design of lightweight energy-absorbing structures, prioritizing controlled and predictable deformation over absolute energy absorption, for crashworthiness and impact mitigation applications.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 400-417"},"PeriodicalIF":6.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145109085","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}

引用次数: 0

Modification of selective laser melting-forming nickel–iron–molybdenum permalloy by trace copper achieves excellent soft magnetic properties 用微量铜对选择性激光熔融成形镍铁钼坡莫合金进行改性，获得了优异的软磁性能

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-09-17 DOI: 10.1016/j.jmrt.2025.09.141

Wenjie Luo, Mingwei Wei, Shaohe Zheng, Guanpeng Liu, Mingfang Xu, Yuhua Chen, Timing Zhang, Shanlin Wang, Jilin Xie

{"title":"Modification of selective laser melting-forming nickel–iron–molybdenum permalloy by trace copper achieves excellent soft magnetic properties","authors":"Wenjie Luo, Mingwei Wei, Shaohe Zheng, Guanpeng Liu, Mingfang Xu, Yuhua Chen, Timing Zhang, Shanlin Wang, Jilin Xie","doi":"10.1016/j.jmrt.2025.09.141","DOIUrl":"10.1016/j.jmrt.2025.09.141","url":null,"abstract":"<div><div>In this study, a nickel–iron–molybdenum (NiFeMo) alloy with 1 wt% copper (Cu) addition, which is referred to as (NiFeMo) <sub>99</sub>Cu<sub>1</sub>, was prepared by selective laser melting. The effects of the process parameters and trace Cu on the microstructure and magnetic properties of the permalloy were systematically studied. The results revealed that the alloy was primarily composed of a γ-(Ni, Fe) solid solution, and the microstructure consisted primarily of columnar crystals epitaxially grown along the temperature gradient. Under the optimal process parameters, the alloy has the highest saturation magnetic induction intensity (82.3 emu/g) and the lowest coercivity (1.26 Oe), which is primarily attributed to the reduction of metallurgical defects, the decrease of internal stress, the increase of high-angle grain boundaries, and the enhancement of oriented grains. This study confirms that the introduction of trace Cu by adding Ni-coated Cu powder can effectively improve the soft magnetic properties of selective laser melting-formed NiFeMo alloy, which provides a novel and valuable idea for developing high-performance additive manufacturing soft magnetic materials.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 1343-1352"},"PeriodicalIF":6.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159783","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}

引用次数: 0

Effects of Cr replacing Fe on microstructure and properties of AlCoCrFeNi2.1 eutectic high entropy alloy Cr取代Fe对AlCoCrFeNi2.1共晶高熵合金组织和性能的影响

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-09-17 DOI: 10.1016/j.jmrt.2025.09.153

Jingmin Duan, Saiyang Luo, Chenglin Hou, Yong Dong, Lingbo Mao

{"title":"Effects of Cr replacing Fe on microstructure and properties of AlCoCrFeNi2.1 eutectic high entropy alloy","authors":"Jingmin Duan, Saiyang Luo, Chenglin Hou, Yong Dong, Lingbo Mao","doi":"10.1016/j.jmrt.2025.09.153","DOIUrl":"10.1016/j.jmrt.2025.09.153","url":null,"abstract":"<div><div>The AlCoCr<sub>x</sub>Fe<sub>2-x</sub>Ni<sub>2.1</sub> (x = 1.1, 1.2, 1.3, 1.4 and 1.5) eutectic high-entropy alloys (EHEAs) were designed and its microstructure, mechanical and corrosion properties were studied. The alloys exhibited uniform face-centered cube (FCC)/ordered body-centered cube (B2) dual-phases eutectic structure. The volume percentage of B2 phases increased from 44 % to 50 % with the increase of Cr contents. A large number of Cr-enriched bcc-structured nanoparticles formed in B2 phases. In addition, the compressive yield strength increases linearly from 672 MPa to 810 MPa while the fracture strength increases from 2385 MPa to 2667 MPa. The electrochemical experiment results showed that the corrosion resistance of the AlCoCr<sub>x</sub>Fe<sub>2-x</sub>Ni<sub>2.1</sub> alloys increased first and then decreased when the values of x increased from 1.1 to 1.5. Among the alloys, the AlCoCr<sub>1</sub><sub>·</sub><sub>2</sub>Fe<sub>0</sub><sub>·</sub><sub>8</sub>Ni<sub>2.1</sub> alloy had the most outstanding corrosion resistance performance with the values of corrosion current density (I<sub>corr</sub>) 1.06 μA/cm<sup>2</sup>, passivation current density (I<sub>pass</sub>) 3.70 μA/cm<sup>2</sup>, pitting potential (E<sub>pit</sub>) 457 mV<sub>SCE</sub>, corrosion potential (E<sub>corr</sub>) −365 mV<sub>SCE</sub>, and polarization resistance (<em>R</em><sub>p</sub>) 410.10 kΩ cm<sup>2</sup>, respectively.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 392-399"},"PeriodicalIF":6.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108913","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}

引用次数: 0

Predicting the service condition of K492M superalloy by high-throughput stress rupture tests and artificial neural network machine learning 采用高通量应力断裂试验和人工神经网络机器学习预测K492M高温合金的使用状况

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-09-17 DOI: 10.1016/j.jmrt.2025.09.148

Chaoqian Song , Yidong Wu , Junhao Zhang , Yixuan Mao , Jingyi Zhou , Lihui Zhang , Jiemin Gao , Xuli Liu , Changkui Liu , Xidong Hui

{"title":"Predicting the service condition of K492M superalloy by high-throughput stress rupture tests and artificial neural network machine learning","authors":"Chaoqian Song , Yidong Wu , Junhao Zhang , Yixuan Mao , Jingyi Zhou , Lihui Zhang , Jiemin Gao , Xuli Liu , Changkui Liu , Xidong Hui","doi":"10.1016/j.jmrt.2025.09.148","DOIUrl":"10.1016/j.jmrt.2025.09.148","url":null,"abstract":"<div><div>Predicting the service condition of cast superalloys for industrial gas turbines and aero-engines is the principal problem to be solved. However, it has long been a formidable issue due to the lack of extensive datasets and a valid model for machine learning (ML). In this work, high-throughput stress rupture tests were conducted for K492M superalloy at temperatures ranging from 650 to 800 °C under stress levels between 130 and 950 MPa over durations from 50 to 130 h. A quantitative database was constructed via the quantitative characterization of microstructural descriptors including the volume fraction and size of γ′ phase, as well as the elemental segregation coefficient. A dual-output full connected neural network (FCNN) model, which consists of four hidden layers with neuron configurations of a 2-1-3-3 set, was formulated to predict the service temperature and stress. The relationship among temperature, stress, service duration and microstructure of K492M superalloy was established by ML. As a result, we successfully predicted the service temperatures and stresses with the average absolute error of 10 °C and 15 MPa, respectively, deviating from the practical values. This work provides a robust framework for predicting the equivalent service conditions and has practical implications for evaluating the service life of cast equiaxed superalloys.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108900","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}

引用次数: 0

A review of microstructure evolution and performance improvements in emerging sintering processes under controlled energy input 在可控能量输入下新兴烧结工艺的微观结构演变和性能改进综述

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-09-16 DOI: 10.1016/j.jmrt.2025.09.129

Runjian Jiang, Elisa Torresani, Eugene A. Olevsky

引用次数: 0

Effects of ligament length and normal stress on the U-shaped pattern of acoustic emission energy in quasi-brittle material shear cracking 韧带长度和正应力对准脆性材料剪切开裂声发射能量u型分布的影响

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-09-16 DOI: 10.1016/j.jmrt.2025.09.101

Hongran Chen , Yuan Cui , Chao Xu , Lei Xue , Siqing Qin

{"title":"Effects of ligament length and normal stress on the U-shaped pattern of acoustic emission energy in quasi-brittle material shear cracking","authors":"Hongran Chen , Yuan Cui , Chao Xu , Lei Xue , Siqing Qin","doi":"10.1016/j.jmrt.2025.09.101","DOIUrl":"10.1016/j.jmrt.2025.09.101","url":null,"abstract":"<div><div>Shear cracking in quasi-brittle materials is a fundamental issue in engineering applications, with acoustic emission (AE) patterns during their cracking process offering potential fracture precursors. These patterns are influenced by geometry and environmental conditions of structures. As in-situ structures exceed specimen dimensions and endure normal stress, assessing their influence on AE patterns is essential for bridging lab-field gaps and for identifying AE precursor patterns with real predictive capability. However, yet characteristic AE patterns under realistic in-situ dimensions and stresses remains elusive. Direct shear experiments on jointed mortar specimens with varying ligament lengths and normal stresses revealed two AE energy distribution patterns: a single-burst pattern featuring one major fracture-related energy burst, and a U-shaped patterns characterized by two energy bursts separated by quiet periods. The former burst of U-shaped pattern arises from localized shear cracking at the ligament's accelerated cracking onset. Ligament length dominates the AE pattern: longer ligaments enhance crack accommodation capacity, facilitating localized shear cracking at accelerated cracking onset, thus favoring distinct U-shaped patterns. Elevated normal stress promotes compression-induced shear cracking, transitioning single-burst to U-shaped patterns in short ligaments but reducing U-shaped identifiability in medium-length ligaments. A statistical damage mechanical model quantifies the AE energy relationship between the fracture point and accelerated cracking onset, showing a magnitude difference <em>ΔM</em> between these two points ≤0.6 for U-shaped patterns. These results indicate the U-shaped pattern probably emerges consistently in large-scale structures, with <em>ΔM</em> confined within a narrow range. This provides important physical foundations for reliable warning for quasi-brittle material fracture.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 801-817"},"PeriodicalIF":6.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120944","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}

引用次数: 0

The effects of nitrogen flow rate and shielding gas type on the microstructure and properties of laser welded high nitrogen austenitic stainless steel joint 氮气流量和保护气体类型对激光焊接高氮奥氏体不锈钢接头组织和性能的影响

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-09-16 DOI: 10.1016/j.jmrt.2025.09.115

Yaohui Shi , Zhangyu Zhu , Xiaoyi Yang , Zongtao Zhu , Xin Lu , Mengnie Victor Li

{"title":"The effects of nitrogen flow rate and shielding gas type on the microstructure and properties of laser welded high nitrogen austenitic stainless steel joint","authors":"Yaohui Shi , Zhangyu Zhu , Xiaoyi Yang , Zongtao Zhu , Xin Lu , Mengnie Victor Li","doi":"10.1016/j.jmrt.2025.09.115","DOIUrl":"10.1016/j.jmrt.2025.09.115","url":null,"abstract":"<div><div>High nitrogen austenitic stainless steel exhibits excellent mechanical properties and corrosion resistance. However, nitrogen loss during welding significantly impacts the performance of the welded joints. This study systematically investigates the effects of nitrogen flow rate and shielding gas type on the microstructure, mechanical properties, and corrosion resistance of laser welded high nitrogen austenitic stainless steel joint. The results indicate that, when nitrogen is used as the shielding gas, increasing the gas flow rate decreases the average ferrite phase content of weld metal (WM) from 2.0 % to 0.8 %, while the nitrogen content increases from 0.38 % to 0.45 %, the increase of nitrogen atmosphere concentration and partial pressure above the molten pool is the main reason for the increase of nitrogen content in the WM. But the tensile strength is not much different, both are about 1290 MPa and the fracture position is in the WM. When argon is used as the shielding gas, the ferrite content of the WM increases to 2.2 %, and the tensile strength of the joint decreases to 1135 MPa. When the nitrogen flow rate is 35L/min, the corrosion rate of the WM is 0.0925mm/a, while the corrosion rate is 0.1052mm/a under argon protection, which is 17.67 % higher than that of the base metal (BM). The reduction of the Cr-depleted zone and the corrosion inhibition of N element with increased nitrogen flow rate are the primary factor contributing to the improved corrosion resistance of the WM.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 430-447"},"PeriodicalIF":6.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108949","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}

引用次数: 0

Microstructure and mechanical properties of Ti–6Al–4V fabricated by electron beam powder bed fusion regulated via hot isostatic pressing 热等静压调节电子束粉末床熔合制备Ti-6Al-4V的组织和力学性能

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-09-16 DOI: 10.1016/j.jmrt.2025.09.075

Kai Sheng , Wenhao Liu , Ningrui Wang , Boliang Li , Longqing Chen , Bo Liu , Ding Ren , Jun Zhu , Ming Yin

{"title":"Microstructure and mechanical properties of Ti–6Al–4V fabricated by electron beam powder bed fusion regulated via hot isostatic pressing","authors":"Kai Sheng , Wenhao Liu , Ningrui Wang , Boliang Li , Longqing Chen , Bo Liu , Ding Ren , Jun Zhu , Ming Yin","doi":"10.1016/j.jmrt.2025.09.075","DOIUrl":"10.1016/j.jmrt.2025.09.075","url":null,"abstract":"<div><div>Electron Beam Powder Bed Fusion Additive Manufacturing (EB-PBF AM) has gained significant industrial recognition due to its advantages in geometric design flexibility, functional integration, and integrated forming. However, EB-PBF fabricated parts are subject to internal gas pores and lack-of-fusion defects accompanied by the formation of metastable α′ martensite in microstructure. To address these challenges, this study employs hot isostatic pressing (HIP) post-processing for microstructure modification and defect elimination, systematically investigating the influence of HIP temperature (880 °C, 920 °C, 960 °C) on microstructure evolution and tensile properties of Ti–6Al–4V alloy. Experimental results demonstrate that the α phase undergoes significant coarsening with increasing HIP temperature, accompanied by the formation of spheroidized α phase particles. Variant selection analysis reveals a monotonic decrease in variant selection intensity with ascending HIP temperatures. After HIP treatment at 920 °C, the samples achieve optimal strength-ductility balance (ultimate tensile strength: 852 MPa, elongation: 18.2 %), primarily attributed to their moderate α phase dimensions and β phase content. Interestingly, despite α phase coarsening after 960 °C HIP compared to 920 °C HIP, the strength exhibits a paradoxical increase, which is attributed to a higher proportion of hard oriented α and the coarsening interface phase for the strengthening of interfacial barriers.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 782-791"},"PeriodicalIF":6.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120958","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}

引用次数: 0

Fusion defects-induced enhancement of fatigue life at elevated temperature of CoCrFeNiMo0.5 alloy produced by laser-powder bed fusion 激光粉末床熔合CoCrFeNiMo0.5合金的高温疲劳寿命

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-09-16 DOI: 10.1016/j.jmrt.2025.09.134

Shuai Tong , Junming Xiong , Zhichao Ma , Chaofan Li , Jiakai Li , Hongwei Zhao , Luquan Ren , Chuliang Yan

{"title":"Fusion defects-induced enhancement of fatigue life at elevated temperature of CoCrFeNiMo0.5 alloy produced by laser-powder bed fusion","authors":"Shuai Tong , Junming Xiong , Zhichao Ma , Chaofan Li , Jiakai Li , Hongwei Zhao , Luquan Ren , Chuliang Yan","doi":"10.1016/j.jmrt.2025.09.134","DOIUrl":"10.1016/j.jmrt.2025.09.134","url":null,"abstract":"<div><div>The inherent porosity in additive manufacturing is typically classified as fusion-related defects, and the low cycle fatigue (LCF) life of most metallic materials diminishes with increasing temperature. Notably, the CoCrFeNiMo<sub>0.5</sub> alloy containing fusion defects exhibited an anomalously enhanced LCF life at elevated temperatures compared to ambient conditions. Utilizing a custom-designed mechanical-thermal coupling fatigue testing apparatus, we conducted LCF assessments of the CoCrFeNiMo<sub>0.5</sub> alloy across a temperature spectrum from 20 °C to 600 °C. Specimens fabricated with three different laser power settings demonstrated increased fatigue life at 200 °C, with the specimen processed at 165 W laser power showing a 65.6 % improvement in LCF life at 200 °C relative to room temperature. Microstructural analysis across multiple scales revealed that porosity acts as a stress dissipation mechanism, mitigating localized stress concentrations, thereby retarding crack initiation and propagation, and ultimately extending fatigue life.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 1159-1167"},"PeriodicalIF":6.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120959","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}

引用次数: 0