Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第z1期    总第1期    2013年12月

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文章编号:1004-0609(2013)S1-0667-06
不同初始组织TiAl合金轧制板材的组织演化
王 震,刘仁慈,刘 冬,崔玉友,杨 锐

(中国科学院 金属研究所,沈阳 110016)

摘 要: 研究锻态组织及其后续热处理得到的近γ等轴组织和全片层组织的TiAl合金板坯在1 280 ℃多道次轧制过程中的组织演化。结果表明:不均匀锻态组织经过6道次轧制变形后组织仍不均匀,而经过热处理的板坯通过6道次轧制,轧态组织较为均匀,其中全片层组织的板坯在整系列轧制道次中,轧态组织最均匀。采用EBSD方法分析TiAl合金中γ相与α2相在轧制过程中的取向差分布,全片层组织板坯在轧制变形中,γ相与α2相的有效应变均高于近γ等轴组织的板坯;在道次变形量为10%~15%条件下,γ相主要发生了动态再结晶,而α2相仍在位错密度累积过程中。

 

关键字: TiAl合金;轧态组织;组织演化

Microstructure evolution of TiAl alloy sheet with different original microstructures
WANG Zhen, LIU Ren-ci, LIU Dong, CUI Yu-you, YANG Rui

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Abstract:The TiAl alloy blank with as-forged microstructure and post heat treatment microstructures, including near γ and fully lamellar microstructure, was rolled at 1 280 ℃ by multi-pass rolling schedule. The effects of different original microstructures on their microstructure evolution in the multi-pass rolling processes were investigated. The results show that the microstructure of the sheet is nonhomogeneous when the plate slab with forged microstructure was rolled with 6 passes. However, it is homogeneous when the slabs with heat treatment microstructure were deformed under the same conditions. The deformation of the slab with fully lamellar microstructure is more uniform in the whole rolling passes than that of the one with near γ microstructure. The misorientation angle distributions of α2 and γ phase were analyzed. The dynamic recrystallization of γ phase happens and the dislocation density of α2 phase is increasing in the condition that the rolling reduction is 10%-15% per pass.

 

Key words: TiAl alloy; rolling microstructure; microstructure evolution

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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