Research Progress in Cooling Phase Transformation of TiAl Alloy and Control of Fine-grained Microstructure

Yang Jieren; Zhang Xiaogan; Cao Bei; Gao Zitong; Hu Rui; Chen Ruirun

doi:10.15980/j.tzzz.2021.02.003

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Research Progress in Cooling Phase Transformation of TiAl Alloy and Control of Fine-grained Microstructure
Vol. 41, Issue 2, Pages: 142-147(2021)
Published： 2021 ，
DOI： 10.15980/j.tzzz.2021.02.003

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[1]杨劼人,张小干,曹蓓,高子彤,胡锐,陈瑞润.TiAl合金冷却相变研究进展及细晶组织调控[J].特种铸造及有色合金,2021,41(02):142-147.

Yang Jieren, Zhang Xiaogan, Cao Bei, et al. Research Progress in Cooling Phase Transformation of TiAl Alloy and Control of Fine-grained Microstructure. [J]. Special Casting & Nonferrous Alloys 41(2):142-147(2021)
[1]杨劼人,张小干,曹蓓,高子彤,胡锐,陈瑞润.TiAl合金冷却相变研究进展及细晶组织调控[J].特种铸造及有色合金,2021,41(02):142-147. DOI： 10.15980/j.tzzz.2021.02.003.

Yang Jieren, Zhang Xiaogan, Cao Bei, et al. Research Progress in Cooling Phase Transformation of TiAl Alloy and Control of Fine-grained Microstructure. [J]. Special Casting & Nonferrous Alloys 41(2):142-147(2021) DOI： 10.15980/j.tzzz.2021.02.003.

摘要

TiAl合金是目前航空航天轻质高温结构的热点材料

其最终显微组织很大程度上决定于其冷却过程。由于TiAl合金相图和相变的复杂性

通过冷却过程控制

获得细晶组织结构成为关注的重要问题。综述了TiAl合金冷却相变的研究成果

并给出了关于Ti-48Al-4Nb-2Cr合金相关的进展:首先介绍了TiAl合金的凝固路径与相变行为

然后分别分析了连续冷却转变（CCT）和等温冷却转变（TTT）行为。进一步建立了Ti-48Al-4Nb-2Cr合金CCT图

并指导获得了一种细晶近片层组织。

Abstract

TiAl alloy is the current hot-spot material of lightweight high-temperature structure in aerospace engineering

of which the final microstructure is largely determined by its cooling process.Due to the complexity of the phase diagram and phase transition of TiAl alloys

it has become an important issue to obtain a fine-grained structure by controlling the cooling process for engineering research.The results of cooling transformation of TiAl alloy were reviewed

and the progress in Ti-48Al-4 Nb-2Cr alloy was presented including expounding the solidification path and phase transformation behavior of TiAl alloy firstly

then the continuous cooling transformation（CCT）and isothermal cooling transformation（TTT）behaviors.Furthermore

a CCT diagram of Ti-48Al-4Nb-2Cr alloy was established and a fine-grained NL（FGNL）microstructure was obtained.