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首页> 外文期刊>Journal of Manufacturing Processes >Effects of post-weld heat treatment on microstructures and properties of laser welded joints of new high-strength Ti-55531 alloy
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Effects of post-weld heat treatment on microstructures and properties of laser welded joints of new high-strength Ti-55531 alloy

机译：焊接后热处理对新型高强度Ti-55531合金激光焊接关节微观结构及性能的影响

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摘要

This study investigated the effects of post-weld heat treatment (PWHT) on microstructures and properties of a laser welded joint of high-strength and high-toughness titanium alloy, namely Ti-5Al-5V-5Mo-3Cr-1Zr (Ti-55531). The experimental results demonstrate that PWHT can improve the tensile strength of the joint by 47.8 %, which reaches 92.4 % of base metal (BM). Average microhardness of a weld metal (WM) of the joint increases from 309 HV in the as-welded state to 371 HV. The analysis shows that PWHT can significantly improve microstructures of the joint, which is an important reason for rising strength of the joint. The BM of the as-welded joint presents a typical duplex microstructure and 10 similar to 20 % of equiaxed alpha(p) phases are inserted into fine transformed beta microstructures. Equiaxed grains are retained in a heat affected zone (HAZ) and the WM is composed of coarse columnar grains. After PWHT, there is no obvious change in microstructures of the BM of the joint. While maintaining beta phases in BM, the edge of equiaxed a phases in the HAZ gradually dissolves and change to the WM microstructure. In the WM, microstructures change the most significantly and a lot of acicular alpha phases appear.
机译：本研究研究了焊接后热处理（PWHT）对高强度和高韧性钛合金激光焊接接头的微观结构和性能的影响，即Ti-5Al-5V-5MO-3CR-1ZR（TI-55531 ）。实验结果表明，PWHT可以通过47.8％提高关节的拉伸强度，达到92.4％的贱金属（BM）。接头的焊接金属（WM）的平均微硬度从焊接状态的309 HV增加到371HV。分析表明，PWHT可以显着改善关节的微观结构，这是关节强度上升的重要原因。作为焊接接头的BM呈现典型的双工微观结构，并且将20％的等式α（P）相的10个类似物插入细转化的β微观结构中。等轴晶粒保留在热影响区（HAZ），WM由粗柱状晶粒组成。在PWHT之后，关节的BM的微观结构没有明显的变化。在保持BM中的β相时，Surz中等轴的相位的边缘逐渐溶解并改变为WM微观结构。在WM中，微观结构最显着变化，并且出现了大量的针状α相位。

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  • 来源
    《Journal of Manufacturing Processes》 |2021年第4期|1329-1335|共7页
  • 作者

    Long Jian; Zhang Lin-Jie; Ning Jie; Zhang Liang-Liang; Wang Xiang; Li Sen; Na Suck-Joo;

  • 作者单位

    Xi An Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Peoples R China;

    Xi An Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Laser beam welding; Ti-5Al-5V-5Mo-3Cr-1Zr (Ti-55531); Post-weld heat treatment;

    机译：激光束焊接;TI-5AL-5V-5MO-3CR-1ZR（TI-55531）;后焊接热处理;

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