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Accelerated formation of M2C carbides by proton irradiation inhibits molten salt corrosion in Ni-based alloy 质子辐照加速形成的 M2C 碳化物可抑制镍基合金的熔盐腐蚀
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-17 DOI: 10.1016/j.jmrt.2024.09.142
Weichi Ji , Zhenbo Zhu , Hefei Huang , Cheng Li , Guanhong Lei , Yan Li

The effect of displacement damage on the corrosion behavior in a molten FLiBe salt environment was investigated. The element distribution and microstructure around the grain boundaries (GBs) after corrosion were characterized. The results show a decrease in corrosion thickness with increasing irradiation dose and the presence of intergranular corrosion. Nanoscales M2C carbides were observed to be distributed, with a denser and thicker distribution in samples with higher irradiation doses. Their distribution depth is related to the Cr depletion region, inhibiting Cr diffusion toward the GBs and surface. Furthermore, the nucleation mechanism of M2C carbides along the GBs and in irradiated regions was revealed, attributed to the combined effects of thermal influences, element preferential dissolution due to corrosion, and irradiation-induced segregation.

研究了位移损伤对熔融 FLiBe 盐环境中腐蚀行为的影响。对腐蚀后晶界(GBs)周围的元素分布和微观结构进行了表征。结果表明,随着辐照剂量的增加,腐蚀厚度减小,并且存在晶间腐蚀。在辐照剂量较高的样品中,观察到纳米级 M2C 碳化物的分布,且分布更密集、更厚。它们的分布深度与铬耗尽区有关,抑制了铬向 GB 和表面的扩散。此外,还揭示了沿 GB 和辐照区域 M2C 碳化物的成核机制,这归因于热影响、腐蚀导致的元素优先溶解和辐照诱导偏析的综合效应。
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引用次数: 0
The design and fabrication of thermoplastic microfluidic chips with integrated micropillars for particle separation 设计和制造用于颗粒分离的集成微柱的热塑性微流体芯片
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-17 DOI: 10.1016/j.jmrt.2024.09.135
Mingyong Zhou , Shunquan Jiang , Xueheng Yang , Qiang Li , Bingyan Jiang , Li Zhou , Lu Zhang

Microfluidic technology utilizing the deterministic lateral displacement (DLD) method holds significant promise for efficiently separating micro-particles and biological cells. Despite the notable high throughput advantages associated with DLD chips, their widespread application is impeded by the substantial manufacturing costs of tens of thousands of micropillars. This study aims to explore the feasibility of employing the injection molding method for the mass production of DLD microfluidic chips. A multistage DLD chip with varied critical diameters was designed to isolate white blood cells from the human whole blood. The separation effectiveness was verified with the polydimethylsiloxane chip fabricated by standard soft lithography. Subsequently, nickel mold inserts were electroformed to fabricate thermoplastic DLD chips via the injection molding. The replication quality of micropillars under different molding parameters was studied. The capability of injection-molded chips to effectively achieve particle separation was validated. Results showed that thermoplastic chips with good replication quality were obtained, providing a scale-up production strategy for fabricating polymer-based microfluidic chips for disposable separation applications.

利用确定性横向位移(DLD)方法的微流体技术在高效分离微颗粒和生物细胞方面前景广阔。尽管 DLD 芯片具有显著的高通量优势,但数以万计微柱的高昂制造成本阻碍了其广泛应用。本研究旨在探索采用注射成型法批量生产 DLD 微流体芯片的可行性。研究人员设计了临界直径不同的多级 DLD 芯片,用于从人体全血中分离白细胞。通过标准软光刻法制造的聚二甲基硅氧烷芯片验证了分离效果。随后,镍模具镶件被电铸,通过注塑成型制造出热塑性 DLD 芯片。研究了不同成型参数下微柱的复制质量。验证了注射成型芯片有效实现颗粒分离的能力。结果表明,热塑性芯片具有良好的复制质量,为制造一次性分离应用的聚合物基微流体芯片提供了规模化生产策略。
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引用次数: 0
Effects of post-heat treatments on the microstructure and mechanical properties of Ti–6Al–4V alloy fabricated by selective laser melting 后热处理对通过选择性激光熔化制造的 Ti-6Al-4V 合金的微观结构和机械性能的影响
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-17 DOI: 10.1016/j.jmrt.2024.09.141
Yuantao Zhao , Yongkang Yue , Wenlong Deng , Jiansheng Li , Ming Chen , Shenqiang Liu , Wenge Li , Yanbo Liu , Vincent Ji

In this study, post-heat treatments were applied to Ti–6Al–4V (TC4) alloy fabricated by selective laser melting (SLM) to investigate the effects of annealing temperature (750–950 °C in 50 °C intervals) on the alloy's microstructure, residual stress and mechanical properties. The initial microstructure of as-SLMed TC4 alloy was dominated by needle-like α′ martensite with a high density of dislocations and minor β phase, resulting in high strength (1190 MPa) but limited ductility (2.2% elongation). Annealing led to the transformation of α′ martensite into α phase, with the β phase content remaining relatively stable. Increasing the annealing temperature caused the acicular martensite to evolve into bundles of coarse α laths, forming a basket-weave microstructure. Annealing at 750 °C for 2 h reduced the yield strength to 1040 MPa and improved elongation to 8.3%. Interestingly, both the strength and ductility decreased with further increases in annealing temperature. This unusual phenomenon was rarely mentioned in current literature and was considered to be associated with the abnormal variations in the Schmid factor of (0001) [11-20] slip system and the reduction of mobile dislocations within the coarsened α martensite. Additionally, annealing combined with air cooling effectively alleviated residual tensile stresses in the SLM-formed TC4 alloy.

本研究对选择性激光熔炼 (SLM) 制造的 Ti-6Al-4V (TC4) 合金进行了后热处理,以研究退火温度(750-950 °C,间隔 50 °C)对合金显微组织、残余应力和机械性能的影响。As-SLMed TC4 合金的初始微观结构以针状α′马氏体为主,具有高密度位错和少量β相,因此强度高(1190 兆帕),但延展性有限(伸长率为 2.2%)。退火导致 α′ 马氏体转变为 α 相,而 β 相含量保持相对稳定。提高退火温度会使针状马氏体演变成成束的α粗板条,形成篮织微观结构。750 °C 退火 2 小时可将屈服强度降至 1040 兆帕,并将伸长率提高至 8.3%。有趣的是,随着退火温度的进一步升高,强度和延展性都有所下降。这种不寻常的现象在现有文献中很少提及,被认为与 (0001) [11-20] 滑移系统中 Schmid 因子的异常变化以及粗化 α 马氏体中移动位错的减少有关。此外,退火结合空气冷却可有效缓解 SLM 成型 TC4 合金中的残余拉伸应力。
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引用次数: 0
Mechanistic role of vanadium microalloying in improving corrosion resistance of low carbon bainitic steel 钒微合金化在提高低碳贝氏体钢耐腐蚀性方面的机理作用
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-17 DOI: 10.1016/j.jmrt.2024.09.149
Chun Feng , Lijuan Zhu , Xuan Cheng , Zhi Li , Xiaolu Gui , Guhui Gao

We here investigated the effect of vanadium microalloying on the microstructure, mechanical properties, especially corrosion performances of low carbon bainitic steels. The corrosion behaviors of the steels with different vanadium contents in 3.5 wt% NaCl solution were evaluated by electrochemical tests (including polarization curves and electrochemical impedance spectroscopic measurements) and alternating immersion test (including weight loss and rust layer observation). Results show that the mechanical properties and corrosion resistance of low carbon bainitic steels can be synergistically improved with vanadium microalloying. With help of the electron backscatter diffraction characterization and scanning Kelvin probe force microscopy, we first discovered that although the number of micro-galvanic couples increases because of grain refinement, the Volta potential gradient between the matrix and grain boundaries are decreased with vanadium microalloying, which can promote the formation of compact protective rust layers and improve the corrosion resistance of vanadium micro-alloyed low carbon bainitic steels.

我们在此研究了钒微合金化对低碳贝氏体钢的微观结构、机械性能,尤其是腐蚀性能的影响。通过电化学试验(包括极化曲线和电化学阻抗谱测量)和交替浸泡试验(包括重量损失和锈层观察),评估了不同钒含量的钢在 3.5 wt% 的 NaCl 溶液中的腐蚀行为。结果表明,钒微合金化可以协同改善低碳贝氏体钢的机械性能和耐腐蚀性。借助电子反向散射衍射表征和扫描开尔文探针力显微镜,我们首次发现虽然微电镀偶的数量因晶粒细化而增加,但基体和晶界之间的伏特电位梯度随着钒微合金化的进行而减小,从而促进了致密保护锈层的形成,提高了钒微合金化低碳贝氏体钢的耐腐蚀性能。
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引用次数: 0
Microstructure characterization and properties of CuFeCo heterostructure alloys 铜铁钴异质结构合金的显微结构表征和性能
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-16 DOI: 10.1016/j.jmrt.2024.09.123
Li Zhang, Jinyi Liu, Lizhen Zhan, Jie Pan, Zixie Wang, Jun Li, Xueshan Xiao

The microstructure and properties of Cu66.6(FeCo)33.4 and Cu60(FeCo)40 alloys were investigated. Microstructural observations show that CuFeCo alloys have formed dual-phase heterostructures comprising face-centered cubic (FCC) and body-centered cubic (BCC) phases. The average grain size of the CuFeCo alloys after cold rolling and aging is less than 10 μm. Cu66.6(FeCo)33.4 has better elongation and electrical conductivity, while Cu60(FeCo)40 has better tensile strength, hardness, saturation magnetization, and electromagnetic interference shielding effectiveness. An increased FeCo content in a finer second phase with a larger volume fraction, leading to more phase boundaries. This enhances the strength of the CuFeCo alloys while simultaneously reducing their elongation. The obtained results can be used for further development of alloys with FCC/BCC dual-phase heterostructures.

研究了 Cu66.6(FeCo)33.4 和 Cu60(FeCo)40 合金的微观结构和性能。显微结构观察表明,CuFeCo 合金形成了由面心立方(FCC)相和体心立方(BCC)相组成的双相异质结构。经过冷轧和时效处理后,CuFeCo 合金的平均晶粒尺寸小于 10 μm。Cu66.6(FeCo)33.4 具有更好的伸长率和导电性,而 Cu60(FeCo)40 则具有更好的抗拉强度、硬度、饱和磁化率和电磁干扰屏蔽效果。铁钴含量的增加使第二相更细,体积分数更大,从而产生更多的相界。这增强了铜铁钴合金的强度,同时降低了其伸长率。所得结果可用于进一步开发具有 FCC/BCC 双相异质结构的合金。
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引用次数: 0
A review on recent progress of refractory high entropy alloys: From fundamental research to engineering applications 难熔高熵合金最新进展综述:从基础研究到工程应用
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-16 DOI: 10.1016/j.jmrt.2024.09.131
Longchao Zhuo , Yixing Xie , Bingqing Chen

Refractory high-entropy alloys (RHEAs) have emerged as frontier materials for high-temperature structural applications due to their exceptional mechanical properties and thermal stability. This review aims to provide a comprehensive and in-depth summary of the latest research progress in the field of RHEAs. By systematically analyzing 253 publications since 2022, this review presents a panoramic overview of the current research status in the field of RHEAs, covering aspects from alloy design, microstructure, processing techniques, mechanical behavior, to physicochemical properties. Key strengthening and toughening mechanisms, such as solid solution strengthening, precipitation strengthening, and grain boundary strengthening, are extensively analyzed. The high-temperature mechanical performance, oxidation resistance, and adaptability of RHEAs in extreme environments including corrosion and irradiation, are critically reviewed, and the potential application value of these research findings in aerospace, nuclear energy, biomedical, and other fields is discussed. Simultaneously, the multidisciplinary characteristics of RHEAs research has revealed the trend of the field evolving from fundamental research to practical applications. Furthermore, with the aid of advanced characterization techniques and computational methods, the review elucidates the controlling effects of chemical short-range order, defect structures, and other factors on the performance evolution of RHEAs, highlighting the importance of multi-principal element synergistic effects. Based on summarizing the key scientific issues and technological bottlenecks faced by RHEAs, the article provides a forward-looking perspective on future research directions, emphasizing development strategies that integrate computation and experiments, and accelerate the transformation of fundamental research into engineering applications, thus providing insights and guidance for developing a new generation of high-performance RHEAs.

难熔高熵合金(RHEAs)因其优异的机械性能和热稳定性,已成为高温结构应用领域的前沿材料。本综述旨在全面深入地总结 RHEAs 领域的最新研究进展。通过系统分析自 2022 年以来发表的 253 篇论文,本综述对 RHEAs 领域的研究现状进行了全景式概述,涵盖了从合金设计、微观结构、加工技术、力学行为到物理化学性能等各个方面。文章广泛分析了固溶强化、沉淀强化和晶界强化等关键强化和增韧机制。对 RHEAs 的高温力学性能、抗氧化性以及在腐蚀和辐照等极端环境中的适应性进行了批判性评述,并讨论了这些研究成果在航空航天、核能、生物医学等领域的潜在应用价值。同时,RHEAs 研究的多学科特点也揭示了该领域从基础研究向实际应用发展的趋势。此外,借助先进的表征技术和计算方法,综述阐明了化学短程有序、缺陷结构和其他因素对 RHEAs 性能演化的控制作用,突出了多主元素协同效应的重要性。文章在总结 RHEAs 面临的关键科学问题和技术瓶颈的基础上,前瞻性地展望了未来的研究方向,强调了计算与实验相结合的发展战略,加速了基础研究向工程应用的转化,从而为开发新一代高性能 RHEAs 提供了启示和指导。
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引用次数: 0
Effect of Nb-doping and AC annealing on the microstructure, magnetism and magnetoimpedance of metallic fibers 掺铌和交流退火对金属纤维微观结构、磁性和磁阻的影响
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-16 DOI: 10.1016/j.jmrt.2024.09.129
Feng Wang , Meifang Huang , Jingshun Liu , Ze Li , Yun Zhang , Shuang Ma , Hongxian Shen , Manh-Huong Phan

This paper systematically studies the changes in the microstructure and magnetic properties of CoFeSiBNb series metallic fibers before and after AC annealing. The influence of current intensity on the magneto-impedance (MI) effect of the fibers is analyzed and the mechanism of current annealing to improve the MI characteristics is further revealed. The results show that the surface of the CoFeSiBNb metallic fibers before and after AC annealing is smooth and continuous, the tensile strength of CoFeSiBNb3 fiber is 5.15 GPa and it is the most stable and fracture-reliable. After AC annealing, metallic fibers' general magnetic properties and MI ratio increase at first with current intensity and then decrease at higher intensities. Specifically, the 140 mA AC annealed metallic fiber shows excellent magnetic properties with Ms, μm, Hc, and Mr values reaching 94.38 emu/g, 0.4326, 34.36 Oe, and 13.94 emu/g, respectively. With an excitation frequency of f = 1 MHz, the fiber's [ΔZ/Zmax]max, ξmax, Hk, and Hp reached 216.81%, 31.04 %/Oe, 1 Oe, and 2 Oe, respectively. During the current annealing process, Joule heat eliminates residual stresses in the fibers while forming atomically ordered micro-domains, which improves the degree of its organizational order. Meanwhile, a stable toroidal magnetic field is generated, which promotes the distribution of the magnetic domain structure of the fibers, thereby improving the MI effect.

本文系统研究了交流退火前后 CoFeSiBNb 系列金属纤维微观结构和磁性能的变化。分析了电流强度对纤维磁阻效应的影响,并进一步揭示了电流退火改善磁阻特性的机理。结果表明,交流退火前后的 CoFeSiBNb 金属纤维表面光滑且连续,CoFeSiBNb3 纤维的抗拉强度为 5.15 GPa,其稳定性和断裂可靠性最高。交流退火后,金属纤维的一般磁性能和 MI 比先随电流强度增加而增加,然后在较高强度下降低。具体来说,140 mA 交流退火后的金属纤维具有优异的磁性能,Ms、μm、Hc 和 Mr 值分别达到 94.38 emu/g、0.4326、34.36 Oe 和 13.94 emu/g。激励频率为 f = 1 MHz 时,光纤的 [ΔZ/Zmax]max、ξmax、Hk 和 Hp 分别达到 216.81%、31.04 %/Oe、1 Oe 和 2 Oe。在当前的退火过程中,焦耳热消除了纤维中的残余应力,同时形成了原子有序的微域,提高了纤维的组织有序度。同时,产生的稳定环形磁场促进了纤维磁畴结构的分布,从而改善了 MI 效果。
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引用次数: 0
Influence of deep-sea hydrostatic pressure on the tribocorrosion behavior and mechanism of La2O3–TiB2–Ni coating 深海静水压力对 La2O3-TiB2-Ni 涂层摩擦腐蚀行为和机理的影响
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-16 DOI: 10.1016/j.jmrt.2024.09.138
Zhengyi Li , botai Su , Pengwei Ren , Lei Wen , Dongbai Sun

To understand the tribocorrosion mechanism of TiB2–Ni coating doped with La2O3 in the deep ocean, the wear and corrosion test of La2O3–TiB2–Ni under various hydrostatic pressures was conducted and discussed in 3.5 wt % NaCl solution. The results indicate that the tribocorrosion mechanism of the La2O3–TiB2–Ni coating transitions from abrasive wear with corrosion under 0.1 MPa to abrasive wear with corrosion and adhesive wear under high hydrostatic pressure. The La2O3–TiB2–Ni coating shows significant enhancements in wear resistance and anti-friction properties compared to the TiB2–Ni coating. As the hydrostatic pressure increases from 0.1 MPa to 30 MPa, the self-corrosion current density experiences an approximate increase of 43.6 μA/cm2.

为了解掺杂 La2O3 的 TiB2-Ni 涂层在深海中的摩擦腐蚀机理,在 3.5 wt % NaCl 溶液中对 La2O3-TiB2-Ni 涂层在不同静水压力下的磨损和腐蚀试验进行了研究和讨论。结果表明,La2O3-TiB2-Ni 涂层的摩擦腐蚀机理从 0.1 MPa 下的磨料磨损和腐蚀过渡到高静水压下的磨料磨损和腐蚀以及粘着磨损。与 TiB2-Ni 涂层相比,La2O3-TiB2-Ni 涂层的耐磨性和抗摩擦性能显著增强。当静水压力从 0.1 兆帕增加到 30 兆帕时,自腐蚀电流密度大约增加了 43.6 μA/cm2。
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引用次数: 0
Unraveling the anisotropic corrosion behavior along the building direction in laser powder bed fusion processed Hastelloy X 揭示激光粉末床熔融加工哈氏合金 X 沿构建方向的各向异性腐蚀行为
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-16 DOI: 10.1016/j.jmrt.2024.09.115
Umer Masood Chaudry , Seung-Chang Han , Kaab bin Tayyab , Ameeq Farooq , Woo-Sung Kim , Tea-Sung Jun

In this study, cubic Hastelloy-X was manufactured by laser powder bed fusion process. A systematic investigation focused on the microstructure and anisotropic electrochemical corrosion behavior along the building direction was conducted. Distinctive columnar dendritic features across melt pool boundaries were consistently observed in the top (HX-T), middle (HX-M), and bottom (HX-B) regions along the building direction. A significant reduction in Mo content from the HX-T to the HX-B was observed, attributed to preferential segregation of Mo during the solidification process. Typical fish-scale molten pool was observed in the HX-B and HX-M, while HX-T consisted of strip molten pool in addition to fish scale molten pool. All samples showed the typical characteristics of Goss texture <110>//BD. HX-M sample showed the largest grain size, highest intensity ∼6.35 mrd and lowest kernel average misorientation value as compared to HX-T and HX-B associated with the remelting of the former solidified layer due to the newly deposited layer. Electrochemical analysis including electrochemical impedance spectroscopy and potentiodynamic polarization scans were conducted in 10 wt% NaCl electrolytes at constant temperature of 25 ± 1 °C. HX-T showed the lowest corrosion rate as compared to HX-M, HX-B (0.55, 23.16 and 16.01 mpy for HX-T, HX-M and HX-B, respectively). The surface morphology of corroded samples revealed that the formation of a compact passive film due to the presence of high atomic % of Mo in HX-T restricted the chloride ions from the electrolyte to penetrate and react with the metal samples subsequently enhancing the corrosion resistance.

本研究采用激光粉末床熔融工艺制造了立方体 Hastelloy-X。研究重点是微观结构和沿构建方向的各向异性电化学腐蚀行为。沿构建方向,在顶部(HX-T)、中部(HX-M)和底部(HX-B)区域持续观察到跨越熔池边界的独特柱状树枝状特征。从 HX-T 到 HX-B,钼含量明显降低,这归因于凝固过程中钼的优先偏析。在 HX-B 和 HX-M 中观察到典型的鱼鳞状熔池,而 HX-T 除了鱼鳞状熔池外,还包括条状熔池。所有样品都呈现出典型的高斯纹理 <110>//BD。与 HX-T 和 HX-B 样品相比,HX-M 样品的晶粒尺寸最大,强度最高 ∼6.35 mrd,晶核平均错位值最低,这与新沉积层导致前凝固层重熔有关。在 10 wt% 的 NaCl 电解质中,在 25 ± 1 °C 的恒温条件下进行了电化学分析,包括电化学阻抗光谱和电位极化扫描。与 HX-M、HX-B 相比,HX-T 的腐蚀速率最低(HX-T、HX-M 和 HX-B 分别为 0.55、23.16 和 16.01 mpy)。腐蚀样品的表面形态显示,由于 HX-T 中含有高原子%的钼,形成了一层紧密的被动膜,限制了电解液中氯离子的渗透并与金属样品发生反应,从而增强了耐腐蚀性。
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引用次数: 0
Unraveling the effects of strain‒induced precipitation on continuous cooling ferrite transformation in titanium‒molybdenum microalloyed steel 揭示应变诱导析出对钛钼微合金钢中持续冷却铁素体转变的影响
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-16 DOI: 10.1016/j.jmrt.2024.09.130
Qifan Zhang , Liejun Li , Jixiang Gao , Zhuoran Li , Songjun Chen , Zhengwu Peng , Xiangdong Huo

Strain‒induced precipitation is a characteristic physical‒metallurgical phenomenon during hot‒rolling in microalloyed steel production that strongly affects the overallthermomechanical control process. In this study, the strain‒induced precipitation behavior in titanium‒molybdenum microalloyed steel was comprehensively investigated, and its complex effects on the austenite/ferrite transformation during continuous cooling were analyzed for the first time, based on stress relaxation and multi‒aspect characterization methods. The stress relaxation results revealed that the fastest strain‒induced precipitation occurred at 900 °C. The precipitates were identified as FCC structured (Ti, Mo)C particles with a coherent or semi‒coherent cubic‒cubic orientation relationship to the austenite matrix. The strain‒induced precipitation proved to increase the ferrite transformation temperature and proportion, significantly refine and homogenize the transformed grains. The intermittent quenching at 0.5 C/s further revealed that the (Ti, Mo)C particles with cubic‒cubic orientation relationship to austenite matrix exerted a dual pinning effect: by pinning dislocations, these particles facilitated diffusion‒controlled ferrite nucleation and growth both at austenite grain boundaries and within grains; by pinning migrating phase interfaces, the particles inhibited the coarsening of ferrite grains. Coupled with compressive testing and strengthening contribution analysis, the strain‒induced precipitation was shown to weaken precipitation strengthening but enhance grain refinement strengthening, thereby providing a novel approach to achieving an optimal balance between microstructural homogeneity and mechanical properties.

应变诱导析出是微合金钢生产热轧过程中的一种特征性物理冶金现象,对整个热机械控制过程有很大影响。本研究基于应力松弛和多视角表征方法,全面研究了钛钼微合金钢中的应变诱导析出行为,首次分析了应变诱导析出对连续冷却过程中奥氏体/铁素体转变的复杂影响。应力松弛结果表明,应变诱导的最快析出发生在 900 ℃。析出物被鉴定为 FCC 结构的 (Ti、Mo)C 颗粒,与奥氏体基体具有一致或半一致的立方-立方取向关系。事实证明,应变诱导沉淀提高了铁素体的转变温度和比例,显著细化和均匀化了转变晶粒。0.5 C/s的间歇淬火进一步表明,与奥氏体基体具有立方立方取向关系的(Ti、Mo)C颗粒发挥了双重夹持效应:通过夹持位错,这些颗粒促进了扩散控制的铁素体在奥氏体晶界和晶粒内部的成核和生长;通过夹持迁移相界面,这些颗粒抑制了铁素体晶粒的粗化。结合抗压试验和强化贡献分析,应变诱导沉淀被证明会削弱沉淀强化,但会增强晶粒细化强化,从而为实现微观结构均匀性和机械性能之间的最佳平衡提供了一种新方法。
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Journal of Materials Research and Technology-Jmr&t
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