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首页> 外文期刊>Materials Science and Engineering >Influence of aging heat treatment on microstructure and tensile properties of laser oscillating welded TB8 titanium alloy joints
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Influence of aging heat treatment on microstructure and tensile properties of laser oscillating welded TB8 titanium alloy joints

机译：老化热处理对激光振荡焊接TB8钛合金接头微观结构和拉伸性能的影响

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摘要

Investigations were conducted on TB8 titanium alloy to assess the influence of aging heat treatment on micro-structure and phase transformations induced by laser oscillating welding, and establish a correlation between tensile properties and microstructure. Low-temperature aging joint consists of ω phase and p phase, while high-temperature aging joint is comprised of a phase and p phase. The formation of poor and rich precipitation zone in weld area was due to segregation of major alloying elements like Al, Mo and Nb. Low-temperature aging deteriorates plasticity of joints, but high-temperature aging improved ambient-/elevated-temperature tensile properties. The effect of aging temperature and aging time were discussed in depth. After aging treatment at 450° Celsius for 1 h, intermediate ω phase in gathering place transformed to a phase, but dispersed to phase still retained. With the increase of aging temperature and aging time, size of a precipitate increased. Note that there is a significant increase (85%) in tensile strength after high-temperature aging treatment and Portevin-Le Chatelier (PLC) effect can be avoided under thermo-mechanical loading conditions. It was found that after 1 h of aging treatment at 550° Celsius followed by air cooling, the welded joints owned the best tensile properties at both ambient and elevated temperature.
机译：对TB8钛合金进行研究，以评估老化热处理对激光振荡焊接诱导的微结构和相变的影响，并建立拉伸性能与微观结构之间的相关性。低温老化关节由ω相和P相组成，而高温老化接头由相和P相组成。焊接区域的贫差和富沉淀区的形成是由于Al，Mo和Nb等主要合金元素的偏析。低温老化劣化关节的可塑性，但高温老化改善了环境/升高的抗拉性性能。深度讨论了衰老温度和老化时间的效果。在450°Celsius的老化处理1小时后，在收集地点的中间ω相变为阶段，但分散到阶段仍然保持。随着衰老温度和老化时间的增加，沉淀物的尺寸增加。注意，在高温老化处理和Portevin-Le Chatelier（PLC）效应下，在热机械负载条件下可以避免，抗拉强度显着增加（85％）。发现在550°Celsius的老化处理后1小时后，通过空气冷却，焊接接头在环境温度和升高的温度下拥有最佳拉伸性能。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|140083.1-140083.10|共10页
  • 作者

    Zhenglong Lei; Yuan Chen; Shengchong Ma; Heng Zhou; Jingtao Liu; Xuefeng Wang;

  • 作者单位

    State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology No. 92 West-Da-Zhi Street Harbin 150001 Heilongjiang People's Republic of China;

    State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology No. 92 West-Da-Zhi Street Harbin 150001 Heilongjiang People's Republic of China;

    State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology No. 92 West-Da-Zhi Street Harbin 150001 Heilongjiang People's Republic of China;

    State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology No. 92 West-Da-Zhi Street Harbin 150001 Heilongjiang People's Republic of China;

    Shanghai Space Propulsion Technology Research Institute Shanghai Academy of Spaceflight Technology No.801 Wan-Fang Road Shanghai 201109 People's Republic of China;

    Shanghai Space Propulsion Technology Research Institute Shanghai Academy of Spaceflight Technology No.801 Wan-Fang Road Shanghai 201109 People's Republic of China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Heat treatment; TB8 titanium alloy; Laser oscillating welding; Microstructure; Tensile property;

    机译：热处理;TB8钛合金;激光振荡焊接;微观结构;拉伸性质;

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