热处理对TiAl合金显微组织的影响

余稳; 周建新; 殷亚军; 涂志新; 冯新; 南海; 林均品; 丁贤飞

doi:10.1007/s12613-021-2252-z

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(6): 1225-1230

Wen Yu, Jianxin Zhou, Yajun Yin, Zhixin Tu, Xin Feng, Hai Nan, Junpin Lin, and Xianfei Ding, Effects of heat treatments on microstructures of TiAl alloys, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1225-1230. https://doi.org/10.1007/s12613-021-2252-z

Cite this article as:

Wen Yu, Jianxin Zhou, Yajun Yin, Zhixin Tu, Xin Feng, Hai Nan, Junpin Lin, and Xianfei Ding, Effects of heat treatments on microstructures of TiAl alloys, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1225-1230. https://doi.org/10.1007/s12613-021-2252-z

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研究论文

热处理对TiAl合金显微组织的影响

1)
华中科技大学材料成形与模具技术国家重点实验室，武汉 430074，中国
2)
中国航发北京航空材料研究院铸造钛合金技术中心，北京 100095，中国
3)
北京市先进钛合金精密成型工程技术研究中心，北京 100095，中国
4)
北京航空材料研究院股份有限公司，北京 100095，中国
5)
北京科技大学新金属材料国家重点实验室，北京 100083，中国

通讯作者:
周建新 E-mail: zhoujianxin@hust.edu.cn

丁贤飞 E-mail: xianfeimail@gmail.com

文章亮点

(1) 系统地研究了单步热处理和两步热处理对TiAl合金显微组织的影响。

(2) 揭示了Al含量的微量变化对TiAl合金热处理及显微组织类型的影响。

(3) 总结了铸造TiAl合金仅通过热处理获取双态组织的条件。

中文摘要

本研究的目的是探究热处理对γ-TiAl合金显微组织的影响。通过铸造方法制备了两根Ti–47Al–2Cr–2Nb（原子百分比）合金铸锭，并对它们进行了两种类型的热处理。通过光学显微镜和扫描电子显微镜对合金原始铸态以及热处理态的显微组织进行了详细表征，同时也对两根铸锭的化学成分进行了检测。研究结果表明，当在1270–1185°C温度范围内进行热处理时，具有46.36at%较低Al含量的铸锭只能获得片层组织，而具有47.01at%较高Al含量的铸锭既可获得近片层组织，也可获得双态组织。这表明，对Ti–47Al–2Cr–2Nb合金而言，Al含量的微量降低将对热处理后的显微组织类型产生影响。在铸态和热处理态的显微组织中均观察到少量的B2相。当在较高的温度进行热处理时（例如1260°C）， B2相主要分布在晶界上。然而，当在较低的温度进行热处理时（例如1185°C），B2相将同时在晶界和片层团内析出。另外，本文也就热处理对晶粒细化和其他显微组织参数的影响进行了分析讨论。

关键词:

Research Article

Effects of heat treatments on microstructures of TiAl alloys

+ Author Affiliations

1)
State Key Laboratory of Materials Processing and Die and Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China
2)
Cast Titanium Alloy R&D Center, Beijing Institute of Aeronautical Materials, Beijing 100095, China
3)
Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology, Beijing 100095, China
4)
Beijing Institute of Aeronautical Materials Co., Ltd., Beijing 100094, China
5)
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

Corresponding authors:
Jianxin Zhou E-mail: zhoujianxin@hust.edu.cn

Xianfei Ding E-mail: xianfeimail@gmail.com
Received: 24 November 2020; Revised: 6 January 2021; Accepted: 15 January 2021; Available online: 16 January 2021

Abstract

Abstract

This study aims to investigate the effects of heat treatments on the microstructure of γ-TiAl alloys. Two Ti–47Al–2Cr–2Nb alloy ingots were manufactured by casting method and then heat-treated in two types of heat treatments. Their microstructures were studied by both optical and scanning electron microscopies. The chemical compositions of two ingots were determined as well. The ingot with lower Al content only obtains lamellar structures while the one higher in Al content obtains nearly lamellar and duplex structures after heat treatment within 1270 to 1185°C. A small amount of B2 phase is found to be precipitated in both as-cast and heat-treated microstructures. They are distributed at grain boundaries when holding at a higher temperature, such as 1260°C. However, B2 phase is precipitated at grain boundaries and in colony interiors simultaneously after heat treatments happened at 1185°C. Furthermore, the effects of heat treatments on grain refinement and other microstructural parameters are discussed.
- TiAl alloys;
- microstructure;
- heat treatment;
- casting

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