金属热处理 ›› 2020, Vol. 45 ›› Issue (5): 157-160.DOI: 10.13251/j.issn.0254-6051.2020.05.030

• 工艺研究 • 上一篇    下一篇

TC4-DT钛合金SH-CCT曲线的测定

赵栋1, 董文超2, 焦清洋1, 权纯逸1, 陆善平2   

  1. 1. 沈阳飞机工业集团有限公司, 辽宁 沈阳 110000;
    2. 中国科学院金属研究所 沈阳材料科学国家研究中心, 辽宁 沈阳 110016
  • 收稿日期:2019-10-27 出版日期:2020-05-25 发布日期:2020-09-02
  • 通讯作者: 董文超,副研究员,博士,E-mail: wcdong@imr.ac.cn
  • 作者简介:赵 栋(1988—),男,工程师,主要研究方向为航空零件热处理及模拟仿真,E-mail: zd1988_24@126.com。

Measurement of SH-CCT curves of TC4-DT titanium alloy

Zhao Dong1, Dong Wenchao2, Jiao Qingyang1, Quan Chunyi1, Lu Shanping2   

  1. 1. Shenyang Aircraft Industry Group Co., Ltd., Shenyang Liaoning 110000, China;
    2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang Liaoning 110016, China
  • Received:2019-10-27 Online:2020-05-25 Published:2020-09-02

摘要: 通过金相法进行了TC4-DT钛合金相变点温度Tβ测定,并利用热膨胀法进行了验证。对不同冷却速度下TC4-DT钛合金的热膨胀量曲线进行测绘,结合显微组织分析和硬度测试,绘制了TC4-DT钛合金的SH-CCT曲线。结果表明,TC4-DT钛合金的相变温度为(945±5) ℃。当冷速小于10 ℃/s时,由β相转变的α相呈不同取向的集束状,同时,晶内出现网篮状α相;当冷速大于10 ℃/s后,组织为马氏体α′相+块状αm相;当冷速超过100 ℃/s后,组织为马氏体α′相。TC4-DT钛合金发生马氏体转变的开始温度为836 ℃,终了温度为760 ℃。

关键词: TC4-DT钛合金, 热膨胀法, SH-CCT曲线, 显微组织, 相变

Abstract: The transformation temperature Tβ of TC4-DT titanium alloy was measured by metallographic method, and verified by thermal expansion method. According to the expansion curves at different cooling rates, the SH-CCT curves of the TC4-DT titanium alloy were plotted by means of metallographic analysis and hardness test. The results show that the transformation temperature of the TC4-DT titanium alloy is (945±5) ℃. When the cooling rate is less than 10 ℃/s, the α phase transformed from β phase is clustered with different orientations, and the net basket-like α phase appears. The microstructure is composed of martensite α phase and massive αm phase when the cooling rate is greater than 10 ℃/s. As the cooling rate exceeds 100 ℃/s, the martensite α′ phase is formed. The start temperature and the finish temperature of martensite transformation in the TC4-DT titanium alloy are 836 ℃ and 760 ℃, respectively.

Key words: TC4-DT titanium alloy, thermal expansion method, SH-CCT curves, microstructure, phase transformation

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