Journal of Materials Processing Technology最新文献_第5页

Guidance for authors on contributions the JMPT considers out of scope 对JMPT认为超出范围的贡献的作者的指导

IF 7.5 2区材料科学 Q1 ENGINEERING, INDUSTRIAL

Journal of Materials Processing Technology

Pub Date : 2025-11-23 DOI: 10.1016/j.jmatprotec.2025.119161

Dragos Axinte

引用次数: 0

Exploring the origin of Mo alloy incompatibility with additive manufacturing for room-temperature strength-ductility synergy 探讨Mo合金与增材制造室温强度-塑性协同不相容的原因

IF 7.5 2区材料科学 Q1 ENGINEERING, INDUSTRIAL

Journal of Materials Processing Technology

Pub Date : 2025-11-22 DOI: 10.1016/j.jmatprotec.2025.119158

Shiqi Ma , Nian Yin , Bo Zhao , Shiru He , Zhinan Zhang , Quanquan Han , Min Zhu , Nan Xu , Hailong Dai , Xiaolei Guo , Xuehui Shen , Shilong Liu , Zhihui Xiong , Shuaihang Pan

Molybdenum (Mo) alloys are long-desired in aerospace, electronics, and biodevice fields. However, their compatibility with additive manufacturing (AM) is challenging to achieve for room-temperature strength-ductility synergy, hindering post-processing and applications. Sadly, different yet inconsistent reasons like oxygen (O) control are believed responsible for Mo alloys’ notorious AM incompatibility. In this study, we have presented a lean Mo-Titanium (Ti) alloy design to elucidate the origin of Mo alloys’ AM incompatibility. Using laser powder bed fusion (LPBF) with different O control and representative solid-solution Mo-Ti (Ti=0.8 wt%) alloys, it is found that the commercial O level LPBF (3000 ppm, i.e., Mo-0.8Ti-0.3 O) enables easier crack-free printing, higher densification, and reduced overall mechanical anisotropy. With this, our investigation, supported by simulations of O and Ti behavior, has validated the interactions of Ti- and O-induced clusters, deformation-induced body-center cubic (BCC)→face-centered cubic (FCC) phase change, and delamination initiation. More specifically, Ti can facilitate BCC→FCC phase change and form Ti-O clusters with a different Orowan strengthening capacity to impede dislocations. Therefore, cracks are likely to form, and gradual delamination occurs when the BCC and FCC phase boundary encounters accumulated dislocations and larger-sized Ti-O and Ti-dilute O-O clusters. With advanced characterization and quantitative strengthening analysis, our approach can be readily adopted to understand the Mo alloy incompatibility with AM, as well as the mechanical outcomes. With this, we highlight and summarize a generic direction of improving Mo alloy strength-ductility synergy at room temperature by AM.

钼（Mo）合金在航空航天、电子和生物器件领域一直是人们所渴望的。然而，它们与增材制造（AM）的兼容性很难实现室温强度-延性协同，阻碍了后处理和应用。可悲的是，不同但不一致的原因，如氧(O)控制被认为是Mo合金臭名昭著的AM不相容的原因。在这项研究中，我们提出了一个精益的Mo- titanium (Ti) alloy设计来阐明Mo合金AM不相容的起源。采用不同O控制和代表性固溶体Mo-Ti （Ti=0.8 wt%）合金的激光粉末床熔炼（LPBF），发现商业O水平的LPBF（3000 ppm，即Mo-0.8Ti-0.3 O）可以实现更容易的无裂纹打印，更高的致密性，并且降低了整体力学各向异性。因此，我们的研究在模拟O和Ti行为的支持下，验证了Ti和O诱导簇的相互作用，变形诱导的体心立方（BCC）→面心立方（FCC）相变和分层起始。更具体地说，Ti可以促进BCC→FCC相变，形成具有不同Orowan增强能力的Ti- o簇，以阻止位错。因此，当BCC和FCC相边界遇到累积的位错和较大尺寸的Ti-O和ti -稀O-O团簇时，容易形成裂纹，并逐渐发生分层。通过先进的表征和定量强化分析，我们的方法可以很容易地用于了解Mo合金与AM的不相容性，以及力学结果。在此基础上，重点总结了利用增材制造技术提高Mo合金室温强度-塑性协同效应的一般方向。

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引用次数: 0

Laser ablation and surface modification-assisted polishing of polycrystalline diamond: From mechanisms of ablation and phase transition to high-efficiency processing 多晶金刚石的激光烧蚀和表面修饰辅助抛光：从烧蚀和相变机理到高效加工

IF 7.5 2区材料科学 Q1 ENGINEERING, INDUSTRIAL

Journal of Materials Processing Technology

Pub Date : 2025-11-21 DOI: 10.1016/j.jmatprotec.2025.119159

Qixian Zhang , Rui Gao , Changning Bai , Kangsen Li , Rui Chen , Yan Bao , Song Yuan , Chi Fai Cheung , Zhigang Dong , Chunjin Wang

Polycrystalline diamond (PCD) exhibits exceptional thermal and electronic properties, making it a critical material for high-power and high-performance electronic devices. However, its extreme hardness, chemical inertness, and variable grain orientation pose significant challenges to efficient polishing. To address this issue, this study proposes a laser ablation and surface modification-assisted polishing method, based on a combined high-fluence and low-fluence laser scanning strategy. The influence of laser parameters on surface morphology and phase composition is systematically investigated, and the effectiveness of the hybrid process is comprehensively validated. The results demonstrate that high-fluence vertical-incidence laser ablation significantly reduces surface roughness through a self-planarization mechanism, arising from the laser energy modulation by surface topography and the material’s intrinsic brittleness. The subsequent low-fluence laser scanning induces substantial phase transitions under combined thermal and stress effects, resulting in a modified layer with reduced hardness and enhanced plastic deformation capacity. In the final mechanical polishing stage, the surface with the combined laser scanning strategy achieves a roughness of 0.33 μm after 60 min of polishing. The maximum material removal rate reaches 24.7 μm/h, which is 2.1 times that of the pristine sample. This is attributed to the synergistic effect of laser-induced planarization and surface modification in enhancing polishing performance. These findings offer valuable insights into the interaction between laser radiation and diamond materials, and present a promising hybrid strategy for high-efficiency PCD processing.

聚晶金刚石（PCD）具有优异的热学和电子学性能，是高功率和高性能电子器件的关键材料。然而，其极高的硬度、化学惰性和可变的晶粒取向对高效抛光提出了重大挑战。为了解决这一问题，本研究提出了一种基于高通量和低通量激光扫描策略的激光烧蚀和表面修饰辅助抛光方法。系统研究了激光参数对表面形貌和相组成的影响，全面验证了混合工艺的有效性。结果表明，高通量垂直入射激光烧蚀通过激光能量受表面形貌调制和材料固有脆性的自平面化机制显著降低了表面粗糙度。随后的低通量激光扫描在热和应力联合作用下诱发了大量相变，导致改性层硬度降低，塑性变形能力增强。在最后的机械抛光阶段，经过60 min的抛光后，采用激光联合扫描策略的表面粗糙度达到0.33 μm。材料去除率最高可达24.7 μm/h，是原始样品的2.1倍。这是由于激光诱导的平面化和表面改性在提高抛光性能方面的协同作用。这些发现为激光辐射与金刚石材料之间的相互作用提供了有价值的见解，并为高效的PCD加工提供了有前途的混合策略。

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引用次数: 0

Analysis and experiment on deep drawing of aluminum thin-walled shells with local reverse bulging 铝薄壁壳局部反胀形拉深分析与试验

IF 7.5 2区材料科学 Q1 ENGINEERING, INDUSTRIAL

Journal of Materials Processing Technology

Pub Date : 2025-11-19 DOI: 10.1016/j.jmatprotec.2025.119150

Wen Sun , Wei Liu , Shijian Yuan

Wrinkling is a major challenge in the deep drawing of ellipsoidal thin-walled aluminum alloy shells, limiting the application of such parts in lightweight structural components. In this study, a modified deep drawing process with actively controlled local reverse bulging was proposed to suppress wrinkling by regulating the stress state via local reverse bulging deformation. To investigate the deformation mechanism and defect control of this process, a geometric model was established to reveal the geometric constraints in the reverse bulging area. A theoretical model based on the energy method was developed to determine the critical wrinkling stress. Defect under different process parameters was predicted using a combined-criteria approach incorporating geometric constraints, wrinkling criteria, and instability criteria. A deep drawing device equipped with a servo-controlled local rigid tool was designed and used to conduct experiments. Moreover, critical wrinkling stress and stress distribution were analyzed for different process parameters. The results show that the proposed process can effectively suppress wrinkling by regulating the stress distribution. The combined-criteria approach agrees well with the experimental results and provides valuable guidance for optimizing process parameters in such ellipsoidal thin-walled shells. This study provides theoretical and experimental guidance for defect control in deep drawing with actively controlled local reverse bulging, and offers a novel method for thin-walled shell forming.

起皱是椭圆型薄壁铝合金壳体拉深成形的主要难题，限制了此类零件在轻量化结构部件中的应用。本文提出了一种主动控制局部反胀形的改进拉深工艺，通过局部反胀形变形调节应力状态来抑制起皱。为了研究这一过程的变形机理和缺陷控制，建立了几何模型，揭示了反胀形区域的几何约束。建立了基于能量法的临界起皱应力理论模型。采用结合几何约束、起皱准则和不稳定性准则的组合准则方法对不同工艺参数下的缺陷进行了预测。设计了一种配有伺服控制局部刚性刀具的拉深装置，并进行了实验。分析了不同工艺参数下的临界起皱应力和应力分布。结果表明，该工艺可以通过调节应力分布有效地抑制起皱。该方法与试验结果吻合较好，为优化此类椭球薄壁壳的工艺参数提供了有价值的指导。该研究为主动控制局部反胀形深拉深缺陷控制提供了理论和实验指导，为薄壁壳体成形提供了一种新的方法。

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引用次数: 0

Crater-free through-silicon vias formation by hybrid multi-step femtosecond laser drilling: Surface morphology control and residual stress reduction 混合多步飞秒激光钻孔形成无坑硅通孔：表面形貌控制和残余应力降低

IF 7.5 2区材料科学 Q1 ENGINEERING, INDUSTRIAL

Journal of Materials Processing Technology

Pub Date : 2025-11-19 DOI: 10.1016/j.jmatprotec.2025.119157

Taesik Kim , Jaebeom Lee , Seon-Jin Choi , Jiyong Park

Through-silicon vias are a key technology in advanced semiconductor packaging to enable high-performance computing applications. Femtosecond laser drilling provides faster processing speed and selective modification compared to conventional dry etching. However, the high pulse energy of the single mode generates rapid plasma expansion, resulting in high residual stress, rough cross-sections, and a low aspect ratio. In contrast, the burst mode, which irradiates low-energy sub-pulses at narrow intervals, produces large surface craters and a wide heat-affected zone owing to the heat accumulation effect. These defects generated by conventional femtosecond laser drilling degrade the overall performance of through-silicon vias. To overcome these limitations, this study proposes a novel hybrid multi-step femtosecond laser drilling process. The proposed process consists of three steps: Step 1 involves guide hole formation using single mode, which provides a plasma expansion path to suppress residual stress generation. Step 2 conducts via hole drilling using burst mode. The guide hole in Step 1 mitigates heat accumulation during this step, which results in a reduction of the heat-affected zone and surface craters. Step 3 focuses on crater trimming using single mode. By designing the ablation diameter according to the laser fluence, the residual craters are effectively removed. This process demonstrates that crater trimming can be achieved solely through laser processing. Experimental results show that the proposed process increased the aspect ratio by approximately 1.7 times, achieved a taper angle of 0.25° at a depth of 100 µm, and produced crater-free via holes. In addition, it improved sidewall roughness (R_q) by approximately 59.3 %, reduced the residual stress by approximately 34.2 %. The proposed process improved via hole quality using solely laser processing technology and validated its applicability for high-density semiconductor packaging.

硅通孔是实现高性能计算应用的先进半导体封装的关键技术。飞秒激光钻孔提供了更快的加工速度和选择性修改相比，传统的干蚀刻。然而，单模的高脉冲能量导致等离子体快速膨胀，导致残余应力高，截面粗糙，宽高比低。相比之下，脉冲模式以较窄的间隔照射低能次脉冲，由于热积累效应，产生较大的表面陨石坑和较宽的热影响区。传统飞秒激光钻孔产生的这些缺陷降低了硅通孔的整体性能。为了克服这些限制，本研究提出了一种新的混合多步飞秒激光钻孔工艺。该工艺包括三个步骤：第一步使用单模导孔形成，提供等离子体膨胀路径以抑制残余应力的产生；步骤2采用爆破方式进行通孔钻孔。步骤1中的导向孔减轻了该步骤中的热量积累，从而减少了热影响区和表面陨石坑。第3步侧重于火山口修剪使用单一模式。根据激光辐照度设计烧蚀直径，有效地去除了残余的凹坑。这一过程表明，火山口修剪可以实现仅通过激光加工。实验结果表明，该工艺将纵横比提高了约1.7倍，在100 µm深度处实现了0.25°的锥度角，并产生了无坑洞的通孔。此外，它提高了侧壁粗糙度（Rq）约59.3% %，降低了残余应力约34.2% %。该工艺仅采用激光加工技术，通过改善孔质量，验证了其在高密度半导体封装中的适用性。

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引用次数: 0

Regulating microstructure and strength-ductility synergy of laser-arc hybrid additive manufactured Al-Zn-Mg-Cu alloy 激光-电弧复合添加剂制备Al-Zn-Mg-Cu合金的组织与强塑性协同调节

IF 7.5 2区材料科学 Q1 ENGINEERING, INDUSTRIAL

Journal of Materials Processing Technology

Pub Date : 2025-11-18 DOI: 10.1016/j.jmatprotec.2025.119156

Dehua Liu , Haoyang Wang , Jiang Bi , Zhuoyun Yang , Guojiang Dong , Fangyong Niu , Guangyi Ma , Bo Cheng , Dongjiang Wu

High-strength Al alloy fabricated by laser powder bed fusion or wire and arc additive manufacturing usually exhibits excessive defects, inherent columnar grain structure and poor performance. To address these problems, we proposed a feasible approach of combination for laser-arc hybrid process and subsequent heat treatment to manufacture the Al-Zn-Mg-Cu alloy with superior mechanical properties. The influences of laser power on defects, microstructure, and corresponding mechanical behavior were systematacially evaluated. The results showed that the laser power could effectively change melting mode and solidification conditions in the molten pool. The porosity in the as-built specimen exhibited a tendency of initial decreased followed by increasing as the laser power ranged from 0 W to 240 W. Compared with laser power of 0 W, the grain size was decreased by 57 % with laser power of 180 W. A number of η precipitates distributed at grain boundary, causing element segregation. Meanwhile, rising the laser power leaded to the reduction of element segregation as well as the content of coarse eutectics. Following the heat treatment, high-density η′ precipitates were uniformly dispersed, generating the precipitation strengthening effect. Hence, an optimized strength-ductility balance with ultimate tensile strength of 602 MPa and elongation of 8.9 % was achieved. This research can provide valuable insights for customizing the high-strength Al alloy component with low porosity and desired microstructure.

采用激光粉末床熔合或线弧增材制造制备的高强度铝合金通常缺陷过多，固有柱状晶粒结构，性能差。针对这些问题，提出了采用激光电弧复合工艺和后续热处理相结合的方法制备具有优良力学性能的Al-Zn-Mg-Cu合金。系统地评价了激光功率对缺陷、显微组织和相应力学行为的影响。结果表明，激光功率可以有效地改变熔池中的熔化方式和凝固条件。在激光功率为0 W ~ 240 W范围内，试样孔隙率呈现先减小后增大的趋势。当激光功率为180 W时，与0 W相比，晶粒尺寸减小了57 %。晶界处分布着大量η相，导致元素偏析。同时，激光功率的提高导致元素偏析的减少和粗共晶含量的降低。热处理后，高密度η′析出相均匀分散，产生析出强化效果。结果表明，该材料的抗拉强度为602 MPa，延伸率为8.9 %。该研究为定制具有低孔隙率和理想组织的高强度铝合金部件提供了有价值的见解。

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引用次数: 0

Metallurgical origin of dual-cracking mechanism in resistance spot welds of dissimilar aluminum alloys 异种铝合金电阻点焊双裂纹机制的冶金成因

IF 7.5 2区材料科学 Q1 ENGINEERING, INDUSTRIAL

Journal of Materials Processing Technology

Pub Date : 2025-11-17 DOI: 10.1016/j.jmatprotec.2025.119154

Yu-Xue Zhang , Hai-Long Jia , De-Ping Jiang , Yi-Hang Yang , Wei Liu , Xiao-Li Zhou , Min Zha , Wei He , Pin-Kui Ma

This study investigates the fundamental mechanisms of solidification cracking in resistance spot welding (RSW) of dissimilar Al–Si/AA5182 alloys with unequal thicknesses. Two distinct cracking behaviors were identified. Unlike previous reports in which cracks predominantly occurred in the partially melted zone, this work reveals that Type I cracks form at the interface between the columnar grain zone (CGZ) and the equiaxed grain zone (EGZ). The asynchronous solidification of these two zones produces a solid-fraction disparity, concentrating thermal shrinkage stress. Simultaneously, the segregation of β-Al₃(Fe,Mn)Si₂ and Mg₂Si particles and the presence of low-melting eutectic films hinder liquid feeding, promoting intergranular cracking. By contrast, Type II cracks develop in the EGZ center under excessive heat input due to severe volumetric shrinkage and the blockage of interdendritic feeding channels, which rupture the remaining eutectic liquid films and generate internal hot cracks. Based on these findings, a dual-cracking mechanism is proposed to describe how thermal–metallurgical nonuniformity and feeding constraints govern crack initiation and propagation. This mechanistic framework provides a broader understanding of solidification cracking under asymmetric solidification conditions, extending beyond the specific Al–Si/Al–Mg system. The insights establish a scientific basis for defect suppression and process optimization in resistance spot welding and other rapid-solidification processes of lightweight alloys.

研究了不同厚度Al-Si /AA5182合金电阻点焊中凝固开裂的基本机理。确定了两种不同的开裂行为。与以往的报告中裂纹主要发生在部分熔化区不同，这项工作揭示了I型裂纹形成于柱状晶区（CGZ）和等轴晶区（EGZ）之间的界面。这两个区域的非同步凝固产生了固相分数差异，集中了热收缩应力。同时，β-Al₃（Fe,Mn）Si₂和Mg₂Si颗粒的偏析以及低熔共晶膜的存在阻碍了液体的进料，促进了晶间开裂。相比之下，在过多的热输入下，由于严重的体积收缩和枝晶间进料通道的堵塞，在EGZ中心形成II型裂纹，使剩余的共晶液膜破裂，产生内部热裂纹。基于这些发现，提出了双裂纹机制来描述热-金相不均匀性和进料约束如何影响裂纹的萌生和扩展。这一机制框架为不对称凝固条件下的凝固开裂提供了更广泛的理解，超出了特定的Al-Si / Al-Mg体系。这为电阻点焊等轻量化合金快速凝固工艺的缺陷抑制和工艺优化提供了科学依据。

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引用次数: 0

A novel pathway to realize the columnar-to-equiaxed transition and mechanical anisotropy suppression in SEBM of 316L 在316L的SEBM中实现柱向等轴转变和力学各向异性抑制的新途径

IF 7.5 2区材料科学 Q1 ENGINEERING, INDUSTRIAL

Journal of Materials Processing Technology

Pub Date : 2025-11-17 DOI: 10.1016/j.jmatprotec.2025.119155

Hongjun Qi , Zhifu Huang , Ziyi Yang , Jiaqi Deng , Zihan Chen , Jian Wang , Yongxin Jian

To address the critical challenge of anisotropy in metal additive manufacturing (AM), a novel strategy has been proposed in this work using SEBM-fabricated 316L stainless steel to achieve the columnar-to-equiaxed transition (CET) and suppress mechanical anisotropy. By simultaneously reducing the power and speed, the thermal gradient (G) and solidification rate (R) were tuned under the constant Volumetric Energy Density (VED). Associating with in-situ recrystallization activated by the sustained thermal dwell at ∼800 °C, CET can be achieved in SEBM 316L. This yields a microstructure with a pronounced increase in equiaxed fraction (13.9 % → 81.9 %) and strong texture weakening (Multiple of Uniform Distribution, MUD 23.75 → 3.01). Consequently, the strength–ductility synergy (Ultimate Tensile Strength, UTS ≈ 603 MPa; Elongation, EL ≈ 71 %) can be realized as well as the near-isotropic mechanical behavior (Index of Plane Anisotropy, IPA ≈ 1.75 %–1.79 %). This study demonstrates that CET can be realized through the combined effect of solidification control and in-situ recrystallization in SEBM, thereby suppressing anisotropy in both microstructure and mechanical performance. The findings can offer transferable guidance for microstructural design and process–structure–property optimization in other alloys AM systems, including nickel-based and other alloys.

为了解决金属增材制造（AM）中各向异性的关键挑战，本研究提出了一种利用sebm制造的316L不锈钢实现柱向等轴转变（CET）并抑制力学各向异性的新策略。在体积能量密度（VED）不变的情况下，通过同时降低功率和速度，调节热梯度(G)和凝固速率(R)。通过在~ 800°C的持续热驻留激活原位再结晶，可以在SEBM 316L中实现CET。结果表明，等轴分数显著增加（13.9 %→81.9 %），织构弱化明显（均匀分布倍数，MUD为23.75→3.01）。因此，可以实现强度-延性协同（极限抗拉强度，UTS≈603 MPa；伸长率，EL≈71 %）和近各向同性力学行为（平面各向异性指数，IPA≈1.75 % -1.79 %）。本研究表明，在SEBM中，通过凝固控制和原位再结晶的联合作用，可以实现CET，从而抑制组织和力学性能的各向异性。研究结果可为其他合金增材制造系统（包括镍基合金和其他合金）的显微组织设计和工艺结构性能优化提供可转移的指导。

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引用次数: 0

Adjustable ring mode laser lap welding of low-carbon steels to pure copper in various forms: Sheets, foil stacks, and gapped foil stacks 可调环模激光搭接低碳钢到各种形式的纯铜：薄板、箔堆、间隙箔堆

IF 7.5 2区材料科学 Q1 ENGINEERING, INDUSTRIAL

Journal of Materials Processing Technology

Pub Date : 2025-11-15 DOI: 10.1016/j.jmatprotec.2025.119152

Qun Ma , Zhekai Huang , Li Cui , Shuhan Yang , Zhaotong Li , Xiang Li , Dingyong He , Shenglong Chen , Xiaolong Duan

Steel/copper dissimilar metal lap joints are key structural components for achieving efficient joining in applications such as new energy vehicles (NEVs). However, their welded joints exhibit extremely high hot crack susceptibility. In this study, adjustable ring mode (ARM) laser welding was employed to systematically investigate the joining of low-carbon steels (LCS) with three forms of copper base metal (BM): copper sheets (CS), copper foil stacks (CFS), and gapped copper foil stacks (G-CFS). The results reveal that the thermal conductivity of the base metal (BM) influences molten pool flow and consequently affects hot crack susceptibility. In particular, the low-carbon steels (LCS)/ gapped copper foil stacks (G-CFS) joint, owing to its unique local thermal resistance, optimizes the thermal behavior of the molten pool, thereby achieving completely crack-free welding. Tensile fracture behavior shows that the low-carbon steels (LCS)/ gapped copper foil stacks (G-CFS) joint, exhibiting no crack initiation, achieved the highest tensile strength of 371 MPa. The low-carbon steels (LCS)/copper foil stacks (CFS) joint exhibiting liquid phase separation demonstrated a tensile strength of 249 MPa, approximately 30.8 % lower than that of the low-carbon steels (LCS)/copper sheets (CS) joint containing hot cracks (360 MPa). This study clarifies the physical mechanism by which the thermophysical properties of the base metal (BM) regulate hot crack initiation in steel/copper lap joints, providing an important theoretical foundation for achieving reliable connections in new energy vehicles (NEVs) systems.

钢/铜异种金属搭接接头是实现新能源汽车（nev）等应用中高效连接的关键结构部件。然而，它们的焊接接头表现出极高的热裂纹敏感性。本研究采用可调环模式（ARM）激光焊接技术，系统研究了低碳钢（LCS）与三种铜母材（BM）的连接：铜片（CS）、铜箔堆（CFS）和缺口铜箔堆（G-CFS）。结果表明，母材的热导率影响熔池流动，从而影响热裂纹敏感性。特别是低碳钢(LCS)/缺口铜箔堆（G-CFS）接头，由于其独特的局部热阻，优化了熔池的热行为，从而实现了完全无裂纹焊接。拉伸断裂行为表明，低碳钢(LCS)/间隙铜箔堆（G-CFS）接头抗拉强度最高，达到371 MPa，无裂纹萌生。存在液相分离的低碳钢(LCS)/铜箔堆（CFS）接头的抗拉强度为249 MPa，比含有热裂纹的低碳钢(LCS)/铜箔堆（CS）接头的抗拉强度（360 MPa）低约30.8 %。本研究阐明了母材（BM）热物理特性调控钢/铜搭接接头热裂纹起裂的物理机制，为实现新能源汽车系统的可靠连接提供了重要理论基础。

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引用次数: 0

Effect of local crystallographic texture on near-surface residual stress variation in machined titanium 局部晶体织构对加工钛近表面残余应力变化的影响

IF 7.5 2区材料科学 Q1 ENGINEERING, INDUSTRIAL

Journal of Materials Processing Technology

Pub Date : 2025-11-14 DOI: 10.1016/j.jmatprotec.2025.119153

Akshay Mundayadan Chandroth , Nikhil Prabhu , Martin Diehl , Marc Seefeldt , Joris Everaerts

Machining of metals causes near-surface plastic deformation, inducing residual stresses that can significantly impact a component's performance. Since most metals are polycrystals these stresses are multiscale in nature. Most studies on machining-induced residual stresses focus on the macroscale, even though microscale stresses, which are more challenging to measure, can deviate significantly from the macroscale average. In this study, microscale residual stresses in annealed Ti-6Al-4V subjected to abrasive wheel cutting are quantified experimentally for the first time. Titanium is of particular interest for this study due to its strong crystallographic anisotropy and the presence of clusters of grains with similar orientation known as microtextured regions (MTRs). Via Focused Ion Beam - Digital Image Correlation ring-core measurements, it is shown that microscale residual stresses are present in the range of ±200 MPa prior to cutting. After cutting, in-plane near-surface residual stresses are found to be more compressive to depths of approximately 20 μm. Cutting also induces out-of-plane near-surface residual stresses, with large dispersion in both tension and compression. The sign of out-of-plane residual stresses is found to correlate with the MTR’s average elastic modulus. Crystal plasticity simulations confirm that elastic anisotropy affects residual stress development due to elastic recovery. Furthermore, lower compressive stress levels during loading combined with a higher elastic recovery promotes the formation of detrimental tensile residual stress in grains, particularly in those oriented for easy basal slip. Overall, this study illustrates the importance of investigating microscale residual stress variation in polycrystalline metals after machining, particularly for highly anisotropic metals.

金属加工引起近表面塑性变形，产生残余应力，这可以显著影响部件的性能。由于大多数金属是多晶体，所以应力在本质上是多尺度的。大多数关于加工残余应力的研究都集中在宏观尺度上，尽管微观尺度的应力可能与宏观尺度的平均值有很大的偏离，而微观尺度的应力测量更具挑战性。本研究首次对Ti-6Al-4V退火后砂轮切削的微尺度残余应力进行了实验量化。由于钛具有很强的晶体各向异性，并且存在具有类似取向的晶粒簇，称为微织构区（MTRs），因此对这项研究特别感兴趣。通过聚焦离子束-数字图像相关环芯测量，表明切割前存在±200 MPa范围内的微尺度残余应力。切削后，在约20 μm深度处，面内近表面残余应力更具压缩性。切削也会引起面外近表面残余应力，在拉伸和压缩中都有很大的分散。发现面外残余应力的符号与MTR的平均弹性模量相关。晶体塑性模拟证实了弹性各向异性影响弹性恢复引起的残余应力发展。此外，加载过程中较低的压应力水平与较高的弹性恢复相结合，促进了颗粒中有害的拉伸残余应力的形成，特别是那些易于基底滑移的颗粒。总的来说，这项研究说明了研究多晶金属加工后微尺度残余应力变化的重要性，特别是对于高度各向异性的金属。

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