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24卷    第8期    总第185期    2014年8月

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文章编号:1004-0609(2014)08-1998-05
热变形参数对Ti2AlNb基合金片层组织演变的影响
李君珺,曾卫东,薛 晨

(西北工业大学 凝固技术国家重点实验室,西安 710072)

摘 要: 采用定量分析方法研究高温变形参数如变形温度、应变速率和变形程度对Ti2AlNb基合金在O+B2两相区片层组织球化行为的影响。结果表明:变形温度影响Ti2AlNb基合金的相组成和尺寸,随温度升高,两相区中O相逐渐转变为基体B2相,并变短、变粗。应变速率的减小可以促进合金元素的扩散,有利于片层组织的球化。变形量对合金片层组织的球化促进作用最大,片层组织球化的临界变形量在0.3~0.5之间,变形量为0.7时合金片层组织几乎完全球化。

 

关键字: Ti2AlNb基合金;变形参数;片层组织;球化行为

Effects of hot deformation parameters on lamellar microstructure evolution of Ti2AlNb based alloy
LI Jun-jun, ZENG Wei-dong, XUE Chen

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China

Abstract:The effects of deformation parameters, including deformation temperature, strain rate, and deformation degree, on the globularization behavior of lamellar structures of Ti2AlNb based alloys with initial lamellar O were studied by isothermal compression in O+B2 filed through quantitative metallography. The results show that the phase composition and size are affected by the deformation temperature. In two-phase filed, the initial lamellar O transforms to B2 phase, and lamellar O becomes shorter and thicker with increasing the deformation temperature. The decrease of the strain rate is propitious to the diffusion of the microstructural composition, which improves the globularization of the initial lamellar O. Deformation degree exerts the greatest impact on the globularization of the lamellar O. The critical deformation degree is 0.3-0.5 and nearly all the lamellae are globularized when the deformation degree is 0.7.

 

Key words: Ti2AlNb based alloy; deformation parameter; lamellar structure; globularization behavior

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

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

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