Materials Characterization最新文献_第9页

A high-performance MIM TA15 alloy scheme: breaking through the trade-off dilemma between fine grain and residual pore in pressureless sintering 一种高性能MIM TA15合金方案：突破无压烧结中细晶粒与残余孔隙之间的权衡困境

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-03-08 DOI: 10.1016/j.matchar.2026.116231

Ranpeng Lu , Yu Pan , Yanjun Liu , Jiayu Li , Xinjing Wang , Peng Yu , Xin Lu

{"title":"A high-performance MIM TA15 alloy scheme: breaking through the trade-off dilemma between fine grain and residual pore in pressureless sintering","authors":"Ranpeng Lu , Yu Pan , Yanjun Liu , Jiayu Li , Xinjing Wang , Peng Yu , Xin Lu","doi":"10.1016/j.matchar.2026.116231","DOIUrl":"10.1016/j.matchar.2026.116231","url":null,"abstract":"<div><div>The trade-off dilemma between fine grain and residual pore has been a challenge in powder metallurgy (PM) titanium (Ti) alloys via pressureless sintering, since the grain growth and densification are both thermally activated. The fabrication of the fine equiaxed-grained Ti-6.5Al-2Zr-1Mo-1V (TA15) alloy with high density is hereby addressed by regulating the grain growth behavior. Results show that an obvious transition in grain boundary migration occurs with the decrease of sintering temperature from 1200 °C to 1050 °C, leading to a nearly three-fold rise in grain boundary migration activation enthalpy <em>E</em><sub><em>a</em></sub> and an almost 10<sup>3</sup>-fold suppression in grain boundary mobility <em>M</em><sub><em>b</em></sub>. The underlying balance in the trade-off dilemma is uncovered in the optimized refined equiaxed-grain and its advantageous densification by grain boundary diffusion, which produces an average grain size of 16.4 ± 0.5 μm and a relative density of 99.1 ± 0.3%. During plastic deformation, the refined equiaxed-grain provides high level of stress to activate the <strong><em><c</em></strong> <strong><em>+</em></strong> <strong><em>a></em></strong> dislocations, disperses the local stress and suppresses the crack propagation, avoiding the premature failure. Accordingly, the fabricated TA15–1050 sample with fine equiaxed-grain and high density exhibits unprecedented room-temperature tensile properties, with the ultimate tensile strength (UTS) of 1053 MPa and elongation (EL) of 17.5%. These values significantly exceed the ASTM B381 for Ti-6Al-4V (TC4) alloy, the GB/T 2965–2023 for TA15 alloy and other pressureless sintered PM Ti alloys reported thus far. This work proposes a cost-effective strategy to fabricate the favorable microstructure with excellent mechanical properties via pressureless sintering.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116231"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386688","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

Evolution of NbN and Z-phase transformation during thermo-mechanical process of Nb-containing AISI 301LN stainless steel 含nb AISI 301LN不锈钢热机械过程中NbN的演化与z相转变

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-03-06 DOI: 10.1016/j.matchar.2026.116229

Yeonggeun Cho , Hyung-Jun Cho , Han-Seop Noh , Sung-Joon Kim

{"title":"Evolution of NbN and Z-phase transformation during thermo-mechanical process of Nb-containing AISI 301LN stainless steel","authors":"Yeonggeun Cho , Hyung-Jun Cho , Han-Seop Noh , Sung-Joon Kim","doi":"10.1016/j.matchar.2026.116229","DOIUrl":"10.1016/j.matchar.2026.116229","url":null,"abstract":"<div><div>The precipitation behavior of Nb-containing precipitates was systematically investigated in Nb-added AISI 301LN stainless steel during hot rolling, intermediate annealing, cold rolling, and final annealing treatment. During hot rolling, <em>Z</em>-phase (NbCrN) and NbN precipitates were preferentially formed along the rolling direction. The formation of these precipitates was promoted by increasing Nb content, while they largely remained undissolved during intermediate annealing treatment owing to their high thermal stability. Cold rolling fragmented coarse precipitates and introduced a high density of defects, thereby increasing the number of favorable nucleation sites for subsequent precipitation. After final annealing treatment, numerous nanoscale precipitates were observed, identified as <em>Z</em>-phase and NbN by chemical and crystallographic indexing. These precipitates exhibited various morphologies including rectangular and spherical shapes, influenced by previous thermo-mechanical process. Quantitative analysis revealed a modest change in the weight fraction of Nb-containing precipitates between hot rolling and cold rolling, followed by a substantial increase after final annealing. <em>Z</em>-phase was consistently identified as the dominant precipitate throughout all processing steps, and its formation appeared to proceed via transformation from pre-existing NbN.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116229"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386748","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

Unveiling microstructure characteristics and cryogenic mechanical properties of friction stir additive manufactured CoCrFeNiMn high-entropy alloy 揭示了搅拌摩擦添加剂制备CoCrFeNiMn高熵合金的显微组织特征和低温力学性能

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-03-06 DOI: 10.1016/j.matchar.2026.116208

J.P. Hu, G.Q. Huang, T. Sun, J. Xu, Z.H. Wang, X.M. Feng, Y.F. Shen

{"title":"Unveiling microstructure characteristics and cryogenic mechanical properties of friction stir additive manufactured CoCrFeNiMn high-entropy alloy","authors":"J.P. Hu, G.Q. Huang, T. Sun, J. Xu, Z.H. Wang, X.M. Feng, Y.F. Shen","doi":"10.1016/j.matchar.2026.116208","DOIUrl":"10.1016/j.matchar.2026.116208","url":null,"abstract":"<div><div>Additive manufacturing of fully-dense, fine-grained equiatomic CoCrFeNiMn high-entropy alloy (HEA) with exceptional cryogenic mechanical properties is of great scientific and industrial interest, yet remains highly challenging. Herein, we successfully fabricated large-scale, three-dimensional, fine-grained CoCrFeNiMn HEA component using friction stir additive manufacturing (FSAM), achieving significantly enhanced mechanical performance. The microstructure, mechanical behavior from room temperature to cryogenic conditions, and fracture characteristics of the FSAM component were systematically examined. The results reveal that FSAM-induced severe thermoplastic deformation markedly refines the grains, achieving an average grain size much smaller than that of the base material (BM). Moreover, the repeated thermal cycling along the build direction induces a gradient microstructure, characterized by increased grain size and decreased dislocation density from the top to the bottom regions. Fracture analyses reveal that dislocation–twin interactions govern the dominant failure mechanisms at both 298 K and 77 K, contributing to the superior strength of the FSAM component compared with the BM. Specifically, the yield strength (YS) increases by 42% to 470 MPa at 298 K and by 27% to 752 MPa at 77 K, while the ultimate tensile strength (UTS) rises by 17% to 617 MPa and by 8.5% to 1092 MPa, respectively. Although ductility is somewhat reduced, an excellent strength–ductility balance is maintained. These results establish FSAM as a viable pathway for producing bulk CoCrFeNiMn HEA component and potentially extendable to other FCC-based medium- and high-entropy alloy systems for demanding cryogenic applications.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116208"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386750","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

Mechanisms of σ phase precipitation and dissolution behavior in a Cr-rich Ni-based superalloy during long-term aging 富cr镍基高温合金长期时效过程中σ相析出与溶解行为机理

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-18 DOI: 10.1016/j.matchar.2026.116169

Yuanpeng Yang , Chang Liu , Jiasheng Dong , Langhong Lou

{"title":"Mechanisms of σ phase precipitation and dissolution behavior in a Cr-rich Ni-based superalloy during long-term aging","authors":"Yuanpeng Yang , Chang Liu , Jiasheng Dong , Langhong Lou","doi":"10.1016/j.matchar.2026.116169","DOIUrl":"10.1016/j.matchar.2026.116169","url":null,"abstract":"<div><div>In this study, σ phase precipitation and dissolution behavior during long-term aging at 900 °C were systematically investigated in a Cr-rich polycrystalline Ni-based superalloy. Multiscale characterization reveals that Cr and W segregation drives the preferential precipitation of lath-like σ phase in the γ matrix. With prolonged aging, σ phase increasingly nucleates at M<sub>23</sub>C<sub>6</sub> carbide interface and grows into the γ matrix. Atomic-scale analysis demonstrates a highly coherent M<sub>23</sub>C<sub>6</sub><strong>/</strong>σ nucleation interface established through long-range atomic matching. While the σ/γ growth interface adopts a stepped configuration to minimize lattice strain, further facilitated by internal planar defects. During later-stage aging, σ phase dissolution is dominated by competitive consumption of Cr due to substantial M<sub>23</sub>C<sub>6</sub> precipitation. Furthermore, mechanical tests indicates that the limited fraction of σ phase leads to a negligible effect on stress-rupture life at 900 °C/200 MPa. This work provides insights into the interfacial mechanisms of σ phase precipitation and the competitive kinetics governing its dissolution, thereby enhancing the understanding of microstructural stability in such alloys.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116169"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386465","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

Influence of deformation mechanisms in coarse and fine grains on the work hardening and fracture behavior of a bimodal-structured Mg-Gd-Y-Zn-Zr alloy 粗晶和细晶变形机制对双峰组织Mg-Gd-Y-Zn-Zr合金加工硬化和断裂行为的影响

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-23 DOI: 10.1016/j.matchar.2026.116193

Ming Li , Xiaojie Zhou , Xu Wang , Shengxiong Tang , Yuanchun Huang , Yongcheng Lin , Jiang Zhang , Xianzheng Lu , Xiaomin Chen

{"title":"Influence of deformation mechanisms in coarse and fine grains on the work hardening and fracture behavior of a bimodal-structured Mg-Gd-Y-Zn-Zr alloy","authors":"Ming Li , Xiaojie Zhou , Xu Wang , Shengxiong Tang , Yuanchun Huang , Yongcheng Lin , Jiang Zhang , Xianzheng Lu , Xiaomin Chen","doi":"10.1016/j.matchar.2026.116193","DOIUrl":"10.1016/j.matchar.2026.116193","url":null,"abstract":"<div><div>The deformation mechanisms of coarse and fine grains in a bimodal-structured Mg-Gd-Y-Zn-Zr alloy and its influence on work hardening and fracture behavior were systematically investigated through in-situ EBSD tensile test at room temperature. Quantitative analysis of slip traces revealed that fine grains with random orientations accommodated plastic strain through basal <a > dislocation slip and grain rotation in deformation stage I (0%–4%). In subsequent deformation stage II (4%–10%), coarse grains with basal orientation accommodated plastic strain through prismatic <a > dislocation slip. In the later stage of plastic deformation, the heterogeneous deformation-induced (HDI) stress at the coarse/fine grain interface promoted the activation of additional non-basal dislocation slip. The improved Hall-Petch relationship, combined with Schmid factor analysis, demonstrated that coarse grains can improve the yield strength of bimodal-structured alloy due to the synergistic contributions of strong basal texture and intragranular lamellar LPSO phases. The heterogeneous deformation between coarse and fine grains induces significant back stress and activates multiple dislocation slip modes, which together enhance work hardening capacity and suppress strain localization. The coarse grains also exhibit crack blunting and deflection effects that effectively impede crack propagation, increase energy absorption during fracture, and delay final failure. These findings provide valuable insights for the microstructural design of bimodal-structured magnesium alloys.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116193"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386575","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

Analysis of the load distribution in a Fe-rich aluminum alloy during tensile deformation using synchrotron X-ray diffraction 用同步x射线衍射分析富铁铝合金拉伸变形过程中的载荷分布

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-09 DOI: 10.1016/j.matchar.2026.116147

Yuliang Zhao , Weixiang He , G. González-Doncel , R. Fernández

{"title":"Analysis of the load distribution in a Fe-rich aluminum alloy during tensile deformation using synchrotron X-ray diffraction","authors":"Yuliang Zhao , Weixiang He , G. González-Doncel , R. Fernández","doi":"10.1016/j.matchar.2026.116147","DOIUrl":"10.1016/j.matchar.2026.116147","url":null,"abstract":"<div><div>The load transfer mechanism during tensile deformation of an Al-Cu-Fe alloy is analysed on the basis of <em>in-situ</em> synchrotron radiation X-ray diffraction data. The alloy was specifically fabricated with a high Fe content to simulate recycled Al alloy. The final aim of the study is to explore the potential of using recycled alloys for structural application. As is well known, recycled Al alloys are characterized by a high amount of Fe content, which is usually detrimental to their mechanical properties. However, microstructural modification through friction stir processing (FSP) has emerged as a promising approach to address this issue. The relevance of the load transfer mechanism after FSP is shown to be outstandingly manifested during the onset of plastic deformation. It is proposed that this mechanism accounts for a well adhered interface between the Al matrix and the Cu- and Fe-rich particles. For comparative purposes the <em>in-situ</em> synchrotron X-ray diffraction measurements were conducted on, both, the as-processed alloy (initial) microstructure as well as FSPed microstructure. As anticipated, relevant findings regarding the load transfer mechanisms are derived from the study in both conditions.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116147"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146196840","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

Effect of deep cryogenic treatment on crack initiation and propagation behavior in M2 high-speed steel 深冷处理对M2高速钢裂纹萌生和扩展行为的影响

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-24 DOI: 10.1016/j.matchar.2026.116197

Guili Xu , Zhiqiang Wu , Peng Huang , Jun Hu , Yihan Zhou , Guoyin Zu

{"title":"Effect of deep cryogenic treatment on crack initiation and propagation behavior in M2 high-speed steel","authors":"Guili Xu , Zhiqiang Wu , Peng Huang , Jun Hu , Yihan Zhou , Guoyin Zu","doi":"10.1016/j.matchar.2026.116197","DOIUrl":"10.1016/j.matchar.2026.116197","url":null,"abstract":"<div><div>This study systematically investigated the effect of deep cryogenic treatment (DCT) on the microstructural evolution and fracture toughness of M2 high-speed steel (HSS), with particular emphasis on the critical role of microstructural variations in crack initiation and propagation behavior. The results revealed that DCT promoted the transformation of unstable retained austenite, significantly increased the density of martensitic boundaries through substructure refinement, and promoted the uniform dispersion of carbides, thereby improving the fracture toughness by 33.8%. Although DCT did not alter the crack initiation sites, it had a pronounced influence on crack propagation behavior. In the conventionally treated specimen, cracks propagated smoothly along prior austenite boundaries or directly through primary carbides. The DCT specimen exhibited frequent crack deflection, blunting, and branching, owing to the refinement of martensitic variant units, the increased density of martensitic block boundaries, and the uniform dispersion of fine carbides. Furthermore, the refinement of martensite decreased the Schmid factor and enhanced its spatial heterogeneity near the crack path, thereby suppressing the activation of favorable slip systems and promoting heterogeneous strain partitioning. Consequently, the formation of dislocation shielding zones ahead of the crack tip effectively reduced the local stress intensity factor and enhanced crack resistance. This study clarifies the mechanism of DCT-induced toughness enhancement in HSS and provides useful guidance for microstructural design and process optimization.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116197"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386694","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

Recrystallization behavior of additively manufactured CrNiCo and GRX810 alloys 增材制造CrNiCo和GRX810合金的再结晶行为

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-03-02 DOI: 10.1016/j.matchar.2026.116211

Reza Roumina , Trevor Balduck , Andreas Bezold , Michael J. Mills , Smith Timothy , Emmanuelle A. Marquis

{"title":"Recrystallization behavior of additively manufactured CrNiCo and GRX810 alloys","authors":"Reza Roumina , Trevor Balduck , Andreas Bezold , Michael J. Mills , Smith Timothy , Emmanuelle A. Marquis","doi":"10.1016/j.matchar.2026.116211","DOIUrl":"10.1016/j.matchar.2026.116211","url":null,"abstract":"<div><div>This study investigated recrystallization behavior and grain growth of additively manufactured oxide dispersion strengthened (ODS) and non-ODS CrNiCo and GRX810 alloys during isothermal annealing at 1100 °C. Microstructural evolution was characterized using EBSD measurements. The presence of Y<sub>2</sub>O<sub>3</sub> nano-particles in the ODS alloys effectively suppressed recrystallization and contributed to maintaining a stable microstructure even after 400 h of annealing, as confirmed by TEM observations. In contrast, non-ODS alloys exhibited recrystallization, where the CrNiCo demonstrated faster recrystallization kinetics than GRX810. The slower recrystallization in the GRX810 alloy was attributed to the pinning effect of MC carbides on some grain boundaries. Misorientation analysis revealed a transformation from low-angle to high-angle grain boundaries during the annealing of non-ODS alloys, indicating the formation of new recrystallized grains and twin boundaries. Grain orientation spread (GOS) maps quantified the recrystallized fraction, confirming the inhibition of recrystallization in ODS alloys and the accelerated recrystallization in the non-ODS CrNiCo alloy. The grain growth was limited after prolonged annealing, correlated with the pinning and solute drag effects.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116211"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386756","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

Long-term creep mechanisms and microstructural stability of boron- and nitrogen-modified 9Cr-2 W ferritic/martensitic steels 硼和氮改性9cr - 2w铁素体/马氏体钢的长期蠕变机制和显微组织稳定性

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-15 DOI: 10.1016/j.matchar.2026.116160

Dong-Ha Kim , Hee Soo Yun , Jun-Hwan Kim , Sung-Ho Kim , Sunghwan Yeo , Jeong Mok Oh , Young-Kook Lee

{"title":"Long-term creep mechanisms and microstructural stability of boron- and nitrogen-modified 9Cr-2 W ferritic/martensitic steels","authors":"Dong-Ha Kim , Hee Soo Yun , Jun-Hwan Kim , Sung-Ho Kim , Sunghwan Yeo , Jeong Mok Oh , Young-Kook Lee","doi":"10.1016/j.matchar.2026.116160","DOIUrl":"10.1016/j.matchar.2026.116160","url":null,"abstract":"<div><div>The long-term creep behavior and microstructural stability of 9Cr–2 W ferritic/martensitic steels FC92B and FC92N, modified with boron and nitrogen, were systematically compared. Thermal creep tests for up to 20,000 h at 923 K and 32 MPa, along with electron back-scattered diffraction (EBSD) and transmission electron microscopy (TEM) analyses, revealed distinct evolution mechanisms in each alloy. FC92B demonstrated superior creep resistance due to the suppression of M<sub>23</sub>C<sub>6</sub> carbide coarsening and the stabilization of prior austenite grain boundaries by boron, retaining approximately 82% of its initial geometrically necessary dislocation (GND) density after 20,000 h. In contrast, FC92N retained only approximately 48% of its GND density because of the accelerated coarsening of M<sub>23</sub>C<sub>6</sub> carbides and the formation of the Laves phase, along with limited dislocation pinning by MX carbonitrides, which promoted rapid recovery and lath coarsening. These findings illustrate that the varying creep resistance of the two alloys originated from the different precipitate coarsening kinetics that influence dislocation mobility. The results highlight the crucial role of trace boron in enhancing the long-term creep stability, offering valuable insights for the alloy design of advanced ferritic/martensitic steels.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116160"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386459","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

Gradient nanostructured surface layer and wear resistance of 42CrMo during magnetic field assisted with ultrasonic surface rolling process 磁场辅助超声表面轧制42CrMo的梯度纳米结构表面层及耐磨性

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-19 DOI: 10.1016/j.matchar.2026.116163

Qingqing Wang, Yu Bi, Zhuofu Wang, Yang Xu, Xianhua Tian, Yanhai Cheng

{"title":"Gradient nanostructured surface layer and wear resistance of 42CrMo during magnetic field assisted with ultrasonic surface rolling process","authors":"Qingqing Wang, Yu Bi, Zhuofu Wang, Yang Xu, Xianhua Tian, Yanhai Cheng","doi":"10.1016/j.matchar.2026.116163","DOIUrl":"10.1016/j.matchar.2026.116163","url":null,"abstract":"<div><div>Using magneto-plasticity effect in ultrasonic surface rolling process (USPR) to improve material properties is an effective strengthening method. Gradient nanostructures and wear resistance of 42CrMo machined surface with magnetic field assisted USRP (MF-USRP) were investigated. The formations of gradient nanostructured surface layers under rolling parameters and MF intensities (maximum 0.12 T) were elucidated with finite element (FE) simulation and cellular automaton (CA) modeling, together with TEM analysis. The relationships between gradient nanostructured surface layers and wear resistance were also analyzed. FE simulation results show that strain rate is increased significantly during MF-USRP. Surface nanostructures is further refined (to about 50 nm) induced by the release of pinning effect under influence of MF, exhibiting a discontinuous dynamic recrystallization. Compared with single USRP, the friction coefficient and wear volume of machined surface with MF-USRP are reduced by 9.22% and 7.97%, respectively, which is mainly manifested as abrasive wear. The improvements in wear resistance are attributed to the increased degree of surface nanocrystallization, reduced surface roughness and surface defects. The study confirms that superposition of MF can enhance surface nanocrystallization of 42CrMo machined surface layer, which provides guidance for the development of MF-USRP technology.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116163"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386476","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