锻造TiAl在热处理时晶粒长大的动力学分析  

Kinetics of Grain Growth in Forged TiAl During Heat-Treatment

作　　者：唐建成[1] 黄伯云[1] 刘文胜[1] 贺跃辉[1] 王健农[1] 

机构地区：[1]中南工业大学,长沙410083

出　　处：《稀有金属材料与工程》2000年第3期164-167,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目!(5 9895 15 0 );国家"86. 3"高技术基金项目!(715 - 0 0 5 - 0 0 40 )

摘　　要：研究了锻造 Ti- 48Al- 2 Cr(at% )在 1180℃到 132 0℃热处理时的组织演变 ,分析了在不同温度等温热处理时晶粒长大的动力学。在 Ta以上等温热处理时 ,晶粒长大迅速 ,其晶粒长大因子为 2 .4。在 Ta以下等温热处理时 ,当热处理时间由 10 min不断延长到 4h时 ,γ晶粒尺寸变化较小 ,α晶粒不断长大。热处理温度越高 ,α晶粒长大越快 ,在 1180℃ ,12 2 0℃ ,12 6 0℃和 130 0℃热处理时 ,α晶粒长大因子分别为 2 .9,2 .8,2 .6 5和 2 .Microstructural variation during the heat treatment of forged Ti 48Al 2Cr(at. %) in the temperature range of 1180℃ to 1320℃ has been investigated. The kinetics of grain growth were analyzed. Isothermal heat treatment at temperatures above the α transus leads to rapid grain growth, and the grain growth exponent being 2 4. Isothermal heat treatment at subtransus temperatures leads to little variation of γ particle size and a progressive increase of α grain with increasing heat treatment time from 10 min to 4 h. And the growth rate of alpha grains decreases with decreasing heat treating temperature. When forged TiAl based alloys are heat treated at 1180℃, 1220℃,1260℃ and 1300℃, the grain growth exponents of α grains are 2.9, 2.8, 2.65 and 2.5 respectively.

关 键 词：热处理 晶粒长大 动力学 锻造TiAl合金 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG166.5[金属学及工艺—金属材料]