Materials Characterization最新文献_第6页

Emergence of hierarchical textural pattern in a Fe-rich FeMnNiCr high-entropy alloy: Identification of Goss texture 富铁FeMnNiCr高熵合金中分层织构模式的出现：高斯织构的识别

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-22 DOI: 10.1016/j.matchar.2026.116189

Vahid Yousefi Mehr , Mohammad Reza Toroghinejad , Yabo Fu , Mahshid Kharaziha , Raouf Rahimzadeh

{"title":"Emergence of hierarchical textural pattern in a Fe-rich FeMnNiCr high-entropy alloy: Identification of Goss texture","authors":"Vahid Yousefi Mehr , Mohammad Reza Toroghinejad , Yabo Fu , Mahshid Kharaziha , Raouf Rahimzadeh","doi":"10.1016/j.matchar.2026.116189","DOIUrl":"10.1016/j.matchar.2026.116189","url":null,"abstract":"<div><div>The evolution of texture has recently attracted interest because of its capacity to affect the metallurgical aspects of high-entropy alloys. Among different components, Goss texture is notable for its uniqueness but remains poorly understood. This study examines Goss development in a multicomponent Fe-rich FeMnNiCr alloy, focusing on the microstructure and texture relationship. After manufacturing via vacuum induction remelting, the alloy undergoes primary rolling and heat treatment at 1000 °C for 1 h, followed by thickness reductions from 12.5% to 50% to encourage texture formation. Notably, after a 50% reduction in thickness, the primary recrystallization texture transformed into a noticeable Goss texture. The observed texture fibers in the rolled samples reflect complex deformation mechanisms, including intermediate textures. Microstructural features such as dislocations, shear bands, and twins highlight the complexity of texture. Also, a dislocation-assisted twin coupling and stress analysis mechanism explains Goss texture formation. In conclusion, the Fe-rich high entropy alloy with developing Goss texture could be promising for structural applications, especially where anisotropic properties are a concern.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116189"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386699","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 post-weld heat treatment on microstructure and mechanical properties of dissimilar TRIP- and slip-assisted high-entropy alloy welds 焊后热处理对不同TRIP和滑移辅助高熵合金焊缝组织和力学性能的影响

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-03-05 DOI: 10.1016/j.matchar.2026.116209

Heechan Jung , Chahee Jung , Sangwon Lee , Gunjick Lee , Hadiseh Esmaeilpoor , Jeoung Han Kim , Seok Su Sohn

{"title":"Effect of post-weld heat treatment on microstructure and mechanical properties of dissimilar TRIP- and slip-assisted high-entropy alloy welds","authors":"Heechan Jung , Chahee Jung , Sangwon Lee , Gunjick Lee , Hadiseh Esmaeilpoor , Jeoung Han Kim , Seok Su Sohn","doi":"10.1016/j.matchar.2026.116209","DOIUrl":"10.1016/j.matchar.2026.116209","url":null,"abstract":"<div><div>Joining HEAs with fundamentally different deformation mechanisms enables the integration of complementary strain-hardening behaviors, while simultaneously introducing challenges related to mechanical mismatch across the weldment. Importantly, welding such dissimilar HEAs gives rise to inherent challenges arising from compositional and microstructural mismatches, for which laser beam welding (LBW), owing to its high precision and low heat input, is particularly suitable. This study investigates the microstructure and mechanical behavior of LBW joints between two precipitation-hardened high-entropy alloys (HEAs) exhibiting distinct deformation mechanisms of transformation-induced plasticity (TRIP) and dislocation slip. Since fusion welding introduces compositional heterogeneity and residual stresses that can deteriorate joint performance, post-weld heat treatment (PWHT) was applied to promote precipitation evolution and enhance mechanical compatibility across the weldment. Aging at 750 °C promotes the formation of transgranular L1<sub>2</sub> and intergranular B2 precipitates across both base metals and the weld zone, establishing a continuous gradient in precipitate density and composition. This microstructure reconciles hardness mismatch, increases the weld-zone strength, and enables sequential strain transfer from the TRIP base metal through the weld into the slip base metal. As a result, the PWHT joint achieves a yield strength of 781 MPa and elongation of 15.9%, corresponding to ∼50% higher yield strength and a threefold increase in ductility compared with the as-welded condition. These findings highlight the role of precipitation evolution in establishing mechanically gradient structures and demonstrate an effective strategy to reconcile strength and ductility in dissimilar HEA weldments.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116209"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386753","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 evolution and mechanical property improvement of Ti-542 alloy under cryorolling-based annealing designs Ti-542合金低温退火组织演变及力学性能改善

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.2026.116217

Jinguang Li , Shengqi Feng , Mi Zhou , Tianshui Zhou , Shidong Zhu , Hui Zhao , Lei Wang , Zhiqiang Zhang

{"title":"Microstructure evolution and mechanical property improvement of Ti-542 alloy under cryorolling-based annealing designs","authors":"Jinguang Li , Shengqi Feng , Mi Zhou , Tianshui Zhou , Shidong Zhu , Hui Zhao , Lei Wang , Zhiqiang Zhang","doi":"10.1016/j.matchar.2026.116217","DOIUrl":"10.1016/j.matchar.2026.116217","url":null,"abstract":"<div><div>The cryorolling at liquid nitrogen temperature and recrystallization annealing treatment (CRAT) has been applied on the Ti-542 metastable β titanium alloy, aiming to address the strength-plasticity inversion issue. The results show that CRAT can significantly modify the microstructure, not only by reducing the average grain size by nearly one order of magnitude, but also by creating a mixed-grain structure when annealing near the phase transformation temperature. The deformation mechanism during cryorolling is mainly governed by {332}〈113〉 twinning, and annealing at 770–780 °C can precisely balance the proportion between detwinning and grain refinement. The strength-plasticity matching of the alloy after CRAT has been remarkably enhanced, where the sample can exhibit a tensile strength of 1138.4 MPa (increased by 27% than the samples without CRAT) and a fracture elongation of 23.1%, overcoming the strength-plasticity trade-off limitation. The deformation behavior analysis by in situ High Energy X-Ray Diffraction (HEXRD) shows that the excellent performance of the alloy arises from the synergistic effects of the coarse-grain/fine-grain structure and advantage/random orientation distribution, which not only enhances the cooperative deformation characteristics but also improves the work hardening capacity. This research is expected to provide a theoretical basis and practical guidelines for the microstructure design and property control of new metastable β titanium alloys.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116217"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386755","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

Precipitation and recrystallization behavior of cold rolled CuTi alloy after aging in a wide range of temperature 冷轧CuTi合金在大范围温度时效后的析出和再结晶行为

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-10 DOI: 10.1016/j.matchar.2026.116150

Q.W. Li , M. Jia , W. Wang , Y.Z. Tian

{"title":"Precipitation and recrystallization behavior of cold rolled CuTi alloy after aging in a wide range of temperature","authors":"Q.W. Li , M. Jia , W. Wang , Y.Z. Tian","doi":"10.1016/j.matchar.2026.116150","DOIUrl":"10.1016/j.matchar.2026.116150","url":null,"abstract":"<div><div>The microstructural evolution and property changes of cold-rolled Cu-4 Ti alloy during aging treatments at temperatures ranging from 300 °C to 800 °C for 20 min were systematically investigated. At temperatures below 400 °C, spinodal decomposition dominated, forming coherent Ti-rich regions and resulting in a peak tensile strength of 1115 MPa. Aging at 500 °C led to peak electrical conductivity of 14.7% IACS and activated partial recrystallization, forming metastable <em>β'</em>-Cu₄Ti precipitates in deformed regions and equilibrium <em>β</em>-Cu₄Ti precipitates in recrystallized regions. Complete recrystallization occurred above 600 °C, improving ductility significantly and increasing the uniform elongation to 32% at 800 °C. The intense cold rolling enhanced discontinuous precipitation via strain energy provision and accelerated the mass transport. The variation of mechanical and electrical properties with aging temperature was discussed, and mechanisms for the precipitation and recrystallization were revealed. This work elucidates the interplay between precipitation, recrystallization, and properties, enabling microstructure and property optimization in Cu<img>Ti alloys.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116150"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386460","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 transition and solution strengthening mechanisms in SiCf/SiC composites joints brazed with medium-entropy alloy filler 中熵合金钎料钎焊SiCf/SiC复合材料接头的梯度转变和固溶强化机制

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.2026.116161

Yu Zhang , Wei Guo , Jiapeng Dong , Han Mei , Tianwei Shao , Datao Xu , Ying Zhu , Hongqiang Zhang

{"title":"Gradient transition and solution strengthening mechanisms in SiCf/SiC composites joints brazed with medium-entropy alloy filler","authors":"Yu Zhang , Wei Guo , Jiapeng Dong , Han Mei , Tianwei Shao , Datao Xu , Ying Zhu , Hongqiang Zhang","doi":"10.1016/j.matchar.2026.116161","DOIUrl":"10.1016/j.matchar.2026.116161","url":null,"abstract":"<div><div>A Ti-Ni-Nb-Zr medium-entropy alloy filler was developed to achieve a uniform microstructure and effective stress transition in the SiC<sub>f</sub>/SiC composites brazed joints. Composition gradients of Ti, Nb, and Ni across the asymmetric interface promoted the formation of a thermal-expansion transition structure, while the solid-solution strengthening contribution of Zr was clarified. A multiscale architecture integrating solution strengthening and stress transition was constructed, enabling synergistic enhancement through thermal-expansion mismatch mitigation and grain-scale stress accommodation. The gradient transition mechanism at the SiC<sub>f</sub>/SiC composites asymmetric interface was elucidated by correlating NbC nucleation-growth-induced stress concentration, high-entropy solid solution effect in Ti-Ni-Nb-Zr, and the crystallographic matching between TiSi₂ and γ-(Ni, Cr, Fe) phases. Benefiting from the coupled strengthening mechanisms, the joint strength increased by nearly 300%, with fracture initiating in the interfacial reaction zone and exhibiting a cross-regional mixed mode. This work provides new mechanistic insight into interfacial design for carbon-based ceramic composites and establishes a scientific basis for the high-temperature brazing of advanced ceramic-metal systems.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116161"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386462","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

Accurate segmentation of high-density dislocations in micrographs with DeepCrack model 基于DeepCrack模型的高密度位错显微图像精确分割

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-27 DOI: 10.1016/j.matchar.2026.116206

Ruohan Shen , Yujia Zhai , Hongda Chen , QinQin Shao , Jia Liu

{"title":"Accurate segmentation of high-density dislocations in micrographs with DeepCrack model","authors":"Ruohan Shen , Yujia Zhai , Hongda Chen , QinQin Shao , Jia Liu","doi":"10.1016/j.matchar.2026.116206","DOIUrl":"10.1016/j.matchar.2026.116206","url":null,"abstract":"<div><div>Dislocations are fundamental defects in crystalline materials that critically influence mechanical properties and deformation mechanisms. Accurate segmentation of dislocation lines in micrographs is essential for quantitative microstructure analysis, yet it remains challenging due to complex contrast variations, high density, and morphological complexity. In this work, we adapt and retrain the DeepCrack model, a deep learning architecture originally designed for crack detection, to segment dislocations in experimental micrographs. Using a carefully annotated dataset of only 124 images acquired via scanning transmission electron microscopy and X-ray topography, which exhibit diverse dislocation morphologies and densities, the retrained model demonstrates strong generalization capability and accurate segmentation performance. It performs robustly even on highly challenging cases with extremely dense dislocation networks and significant image noise, albeit with a trade-off in output quality to avoid overfitting by shortening model training epochs. To overcome this limitation, a model recursion strategy was explored, which demonstrates potential for achieving top-tier recognition accuracy and high-quality binarized segmentation.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116206"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386498","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

Reinforcement of boron carbide (B4C) ceramics with boron nitride nanotubes (BNNTs) 氮化硼纳米管增强碳化硼（B4C）陶瓷

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.2026.116195

Heng Wang , Yi Zeng , Tianbin Zhu , Yibiao Xu , Lixia Fan , Yawei Li , Yajie Dai , Fan Zhang

{"title":"Reinforcement of boron carbide (B4C) ceramics with boron nitride nanotubes (BNNTs)","authors":"Heng Wang , Yi Zeng , Tianbin Zhu , Yibiao Xu , Lixia Fan , Yawei Li , Yajie Dai , Fan Zhang","doi":"10.1016/j.matchar.2026.116195","DOIUrl":"10.1016/j.matchar.2026.116195","url":null,"abstract":"<div><div>Boron nitride nanotubes (BNNTs) were incorporated as a reinforcing additive into boron carbide (B<sub>4</sub>C) ceramic matrices and consolidated <em>via</em> spark plasma sintering (SPS) at 1650–1800 °C. The resulting B<sub>4</sub>C-BNNTs ceramic composites achieved a high relative density of 99.71 ± 0.12%, along with an optimal flexural strength of 702 ± 16 MPa, fracture toughness of 4.98 ± 0.13 MPa·m<sup>1/2</sup>, and Vickers hardness of 35.3 ± 0.13 GPa—representing improvements of 226 MPa (47.47%), 1.21 MPa·m<sup>1/2</sup> (32.10%), and 2.0 GPa (6.01%) over monolithic B<sub>4</sub>C, respectively. The enhanced mechanical performance is attributed to a combination of reinforcement mechanisms: (i) BNNTs-induced promotion of B<sub>4</sub>C grain rearrangement, facilitated by the reduced densification temperature; (ii) <em>in-situ</em> formation of ZrB<sub>2</sub> and semi-coherent ZrB<sub>2</sub>/B<sub>4</sub>C interfaces; and (iii) crack bridging, deflection, and propagation resistance provided by BN and ZrB<sub>2</sub>. This study elucidates the underlying reinforcement mechanisms in BNNTs-reinforced B<sub>4</sub>C composites and provides a theoretical foundation for utilizing BN-based nanostructures to enhance the mechanical properties of B<sub>4</sub>C ceramics.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116195"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386576","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 evolution and precipitate phase growth mechanism of hypereutectoid Al-37Fe-2Er alloy 过共析Al-37Fe-2Er合金组织演变及析出相生长机制

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-16 DOI: 10.1016/j.matchar.2026.116159

Yifan Zhang , Haiyang Hu , Zhongliang Song , Shan Zhang , Wenhui Wu , Wenhui Zhang , Jinshuai Zhang

{"title":"Microstructure evolution and precipitate phase growth mechanism of hypereutectoid Al-37Fe-2Er alloy","authors":"Yifan Zhang , Haiyang Hu , Zhongliang Song , Shan Zhang , Wenhui Wu , Wenhui Zhang , Jinshuai Zhang","doi":"10.1016/j.matchar.2026.116159","DOIUrl":"10.1016/j.matchar.2026.116159","url":null,"abstract":"<div><div>Rare earth elements are widely used in Al alloy materials due to their ability to optimize the microstructure. The microstructure evolution of the Al-37Fe-2Er alloy and the growth mechanism of the Al<sub>8</sub>Fe<sub>4</sub>Er precipitate phase were studied via synchrotron X-ray microtomography, confocal laser scanning microscopy and density functional theory calculation. The results show that the microstructure of the Al-37Fe-Er alloy consists of the Al<sub>8</sub>Fe<sub>4</sub>Er phase, proeutectoid FeAl<sub>2</sub> phase, and the eutectoid structure of FeAl+FeAl<sub>2</sub>. The Al<sub>8</sub>Fe<sub>4</sub>Er phase is formed through three pathways: direct precipitation from the liquid phase, formation from the Fe<sub>5</sub>Al<sub>8</sub> phase via massive transformation, and solid-state phase transformation at the front of the eutectoid structure. The Al<sub>8</sub>Fe<sub>4</sub>Er phase grows along the 〈101〉 direction and the coupling of lattice distortion and elastic strain energy significantly reduce the phase transition potential barrier. The Al<sub>8</sub>Fe<sub>4</sub>Er phase mainly undergoes massive transformation dominated by short-range diffusion and lattice shear, and has no orientation relationship with the parent phase Fe<sub>5</sub>Al<sub>8</sub>.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116159"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386464","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

Mesoscale quantification of Mg2Si precipitation heterogeneity in Al6061 using low-interaction-volume atomic-ratio EDS mapping 利用低相互作用体积原子比能谱图量化Al6061中Mg2Si析出非均匀性的中尺度研究

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.2026.116162

Hyeunseok Cheun, Young Choi, Seungkyu Moon, Choul Kim, Jaesung Hwang, Young Hwan Min, Hui-Youn Shin

{"title":"Mesoscale quantification of Mg2Si precipitation heterogeneity in Al6061 using low-interaction-volume atomic-ratio EDS mapping","authors":"Hyeunseok Cheun, Young Choi, Seungkyu Moon, Choul Kim, Jaesung Hwang, Young Hwan Min, Hui-Youn Shin","doi":"10.1016/j.matchar.2026.116162","DOIUrl":"10.1016/j.matchar.2026.116162","url":null,"abstract":"<div><div>Quantifying the spatial heterogeneity of Mg<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>Si precipitates in Al6061 alloys is critical for optimizing mechanical reliability but remains challenging due to the scale gap between XRD and TEM. This study presents a quantitative SEM-EDS mapping protocol optimized for mesoscale characterization. By employing a low accelerating voltage (10 kV) to restrict electron interaction volume and applying pixel-wise atomic ratio analysis (<span><math><mrow><msub><mrow><mi>C</mi></mrow><mrow><mi>Mg</mi></mrow></msub><mo>/</mo><msub><mrow><mi>C</mi></mrow><mrow><mi>Si</mi></mrow></msub></mrow></math></span>), we effectively segmented precipitate-enriched regions. Despite matrix absorption effects, a strict stoichiometric threshold (<span><math><mrow><mn>2</mn><mo>.</mo><mn>00</mn><mo>±</mo><mn>0</mn><mo>.</mo><mn>05</mn></mrow></math></span>) allowed for the isolation of high-confidence precipitate cores. The method revealed a <span><math><mo>∼</mo></math></span>13.5-fold increase in precipitate cluster area after T6 aging, capturing spatial densification more sensitively than the 2.7-fold volume increase measured by bulk XRD. Furthermore, integrating these maps with EBSD strain analysis demonstrated that these clusters form a network architecture spatially correlated with high-strain grain boundaries. This methodology offers a rapid and statistically representative analysis for monitoring precipitation inhomogeneity, effectively filling the analytical gap between bulk diffraction and nanoscale imaging.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116162"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386501","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

Laser powder bed fusion of SAF 3207 hyper duplex stainless steel featuring columnar-to-equiaxed transition SAF 3207超双相不锈钢的激光粉末床熔合，具有柱状到等轴转变

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.2026.116190

Jalal Kangazian , Soung Yeoul Ahn , Bon Woo Koo , Jae Heung Lee , Shi Woo Lee , Muhammad Raihan Hashmi , Hyoung Seop Kim

{"title":"Laser powder bed fusion of SAF 3207 hyper duplex stainless steel featuring columnar-to-equiaxed transition","authors":"Jalal Kangazian , Soung Yeoul Ahn , Bon Woo Koo , Jae Heung Lee , Shi Woo Lee , Muhammad Raihan Hashmi , Hyoung Seop Kim","doi":"10.1016/j.matchar.2026.116190","DOIUrl":"10.1016/j.matchar.2026.116190","url":null,"abstract":"<div><div>This study reports the successful fabrication of SAF 3207 hyper duplex stainless steel (HDSS) via laser powder bed fusion (LPBF), a high-performance alloy with an exceptional pitting resistance equivalent number (PREN = 51.5). By optimizing process parameters at layer thicknesses of 30 μm and 50 μm, a processing window and near-full densification (≥99.9%) were achieved, accompanied by a dual-phase microstructure containing 8–20% austenite phase. The solidification path of SAF 3207 is governed by its high growth restriction factor and pronounced constitutional undercooling, which promote the columnar-to-equiaxed (CET) transition and enhance austenite stability. Compared to conventional DSS (duplex stainless steel) grades such as SAF 2205 and SAF 2507, Thermo-Calc simulations support a more pronounced ferritic–austenitic solidification tendency for SAF 3207 under the same assumptions. The resulting microstructure exhibits a yield strength exceeding 1280 MPa and uniform elongation up to 7%. Notably, even under high-productivity LPBF conditions with layer thicknesses up to 50 μm, mechanical performance remains robust despite minor porosity. Overall, this work presents SAF 3207 HDSS as a promising option for additive manufacturing of structural components, owing to its distinctive CET transition microstructure, which is clearly distinguishable from those typically reported for LPBF-fabricated DSS grades. Notably, few studies have systematically examined how layer thickness influences productivity, microstructural characteristics, and tensile properties in LPBF-produced DSSs.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116190"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386537","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