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首页> 外文期刊>Materials Science and Engineering >Revealing tensile behaviors and fracture mechanism of Ti-6Al-4V titanium alloy electron-beam-welded joints using microstructure evolution and in situ tension observation
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Revealing tensile behaviors and fracture mechanism of Ti-6Al-4V titanium alloy electron-beam-welded joints using microstructure evolution and in situ tension observation

机译：使用微观结构演化和原位张力观察，揭示Ti-6Al-4V钛合金电子束焊接接头的拉伸行为和断裂机理

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摘要

This study aimed to systematically investigate the microstructure evolution of the nail-shaped weld on electron beam welded joint of Ti-6Al-4V alloy. The microstructure evolution demonstrated that the needle martensitic α' phases constituted the microstructure in the fusion zone, in which the grain size decreased in the depth direction, and the Widmannstaetten structure lamellar α phases covered the base metal. The fusion zone got the strongest tensile strength that reached 980 MPa due to the smallest grain size and the largest number of low angle grain boundary, whereas the tensile strength of the base metal was the lowest in the whole butt joint. The best plastic deformation capacity in the base metal in which the strain approached 13 % was attributed to the largest number of high angle grain boundary in the Widmannstaetten structure. Moreover, there were many deformation twins and faults in fusion zone to enhance the resistance to deformation. The tip of the nail-shaped weld was the brittlest location in the entire joint. The experiment also explored the fracture mechanism by in situ observation of tension and fractography, which involved the following three processes: the nucleation and growth of microvoids, the formation of microcracks produced by microvoids, and the occurrence of fracture caused by the growth and propagation of microcracks.
机译：本研究旨在系统地研究了Ti-6AL-4V合金电子束焊接接头上的钉形焊缝的微观结构演变。微观结构演变证明，针马氏体α'阶段构成了融合区中的微观结构，其中晶粒尺寸在深度方向上降低，并且覆盖覆盖覆盖基础金属的覆盖物结构层α相。由于最小的粒度和最大数量的低角度晶界，融合区具有最强的拉伸强度，达到980MPa，而基础金属的拉伸强度是整个对接接头中最低的。在其突出的基础金属中的最佳塑性变形容量归因于Widmanntaetten结构中最大数量的高角度晶界。此外，融合区中存在许多变形双胞胎和故障，以增强变形的抵抗力。钉形焊缝的尖端是整个接头中的最大位置。该实验还通过原位观察张力和断裂探讨了裂缝机制，涉及以下三种方法：微毒性的成核和生长，细胞产生的微裂纹以及由生长和繁殖引起的骨折发生微裂纹。

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  • 来源
    《Materials Science and Engineering》 |2021年第8期|141811.1-141811.13|共13页
  • 作者

    Wenjun Sun; Shanlin Wang; Ming Wu; Min Hong; Yuhua Chen; Jijun Xin; Peng Zhang; Yuanbin Qin; Naiwen Fang;

  • 作者单位

    Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Components Nanchang Hongkong University Nanchang 330036 China State Key Laboratory for Mechanical Behavior of Materials Xian Jiaotong University Xian 710049 China;

    Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Components Nanchang Hongkong University Nanchang 330036 China;

    Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Components Nanchang Hongkong University Nanchang 330036 China;

    Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Components Nanchang Hongkong University Nanchang 330036 China;

    Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Components Nanchang Hongkong University Nanchang 330036 China;

    Songshan Lake Materials Laboratory Dongguan 523808 China;

    State Key Laboratory for Mechanical Behavior of Materials Xian Jiaotong University Xian 710049 China;

    State Key Laboratory for Mechanical Behavior of Materials Xian Jiaotong University Xian 710049 China;

    Harbin Welding Institute Limited Company Harbin 150028 China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Ti-6Al-4V titanium alloy; Microstructure; In situ tension observation; Digital image correlation measure; Fracture mechanism;

    机译：Ti-6Al-4V钛合金;微观结构;原位张力观察;数字图像相关测量;骨折机制;

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