| TC4-DT钛合金SH-CCT曲线的测定 |
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| 引用本文： | 赵栋,董文超,焦清洋,权纯逸,陆善平.TC4-DT钛合金SH-CCT曲线的测定[J].金属热处理,2020,45(5):157-160. |
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| 作者姓名： | 赵栋 董文超 焦清洋 权纯逸 陆善平 |
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| 作者单位： | 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 |
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| 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 ℃。
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| 关 键 词： | TC4-DT钛合金 热膨胀法 SH-CCT曲线 显微组织 相变 |
| 收稿时间： | 2019-10-27 |
Measurement of SH-CCT curves of TC4-DT titanium alloy |
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| Zhao Dong,Dong Wenchao,Jiao Qingyang,Quan Chunyi,Lu Shanping.Measurement of SH-CCT curves of TC4-DT titanium alloy[J].Heat Treatment of Metals,2020,45(5):157-160. |
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| Authors: | Zhao Dong Dong Wenchao Jiao Qingyang Quan Chunyi Lu Shanping |
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| Affiliation: | 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 |
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| 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. |
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| Keywords: | TC4-DT titanium alloy thermal expansion method SH-CCT curves microstructure phase transformation |
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