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Investigation on high temperature short-term creep and stress relaxation of titanium alloy

机译：钛合金的高温短期蠕变和应力松弛研究

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摘要

In this paper, the short-term creep and stress relaxation tests were performed on Ti-6Al-4V alloy at temperatures of 650-800 ℃. Creep time of 60 min and stress relaxation time of 30 min were adopted, respectively. The obtained stress exponent of 1.62 from stress relaxation test falls within exponent range of 1.6-1.69 from creep tests at 700 ℃ while stress exponent of 1.82 obtained from stress relaxation is in the exponent range of 1.52-1.97 from creep tests at 750 ℃. The thermal activation energy of 238.13 kJ is obtained from creep tests under initial stress of 45 MPa. The microstructures of the tested specimens were investigated by transmission electron microscope and electron back-scattered diffraction to study and compare the mechanisms of creep and stress relaxation. Microstructure analysis shows that the creep and stress relaxation behaviors are both governed by vacancy diffusion at 650 ℃. Above 650 ℃, the two behaviors are mainly controlled by dislocation climb. Nevertheless, the dislocations are generated from different sources for creep and stress relaxation.
机译：本文在650-800℃的温度下对Ti-6Al-4V合金进行了短期蠕变和应力松弛测试。分别采用蠕变时间60分钟和应力松弛时间30分钟。应力松弛试验得到的应力指数为1.62，在700℃蠕变试验得到的应力指数在1.6-1.69的范围内，应力松弛试验得到的应力指数为1.82，在750℃下蠕变试验得到的应力指数为1.52-1.97的指数范围。通过在45 MPa的初始应力下的蠕变测试获得了238.13 kJ的热活化能。通过透射电子显微镜和电子背散射衍射研究了试样的微观结构，以研究和比较蠕变和应力松弛的机理。显微组织分析表明，蠕变和应力松弛行为均受650℃空位扩散的支配。在650℃以上，两种行为主要受位错爬升控制。然而，位错是从不同的来源产生的，以引起蠕变和应力松弛。

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  • 来源
    《Materials Science and Engineering》 |2015年第3期|172-180|共9页
  • 作者

    Yingying Zong; Po Liu; Bin Guo; Debin Shan;

  • 作者单位

    National Key Laboratory for Precision Hot Processing of Metals & School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;

    National Key Laboratory for Precision Hot Processing of Metals & School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;

    National Key Laboratory for Precision Hot Processing of Metals & School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;

    National Key Laboratory for Precision Hot Processing of Metals & School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Titanium alloy; Creep; Stress relaxation; Recovery; Diffusion;

    机译：钛合金蠕变;压力松弛;复苏;扩散;

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