热处理细化铸态Ti46Al8Nb合金晶粒
来源期刊:中国有色金属学报2006年第1期
论文作者:陈波 江治国 赵秀娟 刘奎 李依依
文章页码:29 - 34
关键词:Ti46Al8Nb合金; 热处理; 晶粒细化
Key words:Ti46Al8Nb alloy; heat treatment; grain refinement
摘 要:研究一种热处理制度对细化铸造Ti46Al8Nb合金晶粒所起的作用。 结果表明, 加热至1 360 ℃于900 ℃熔融盐淬火—退火—正火处理能够有效地破坏合金稳定、 粗大的铸态组织, 铸态晶粒尺寸由800 μm可细化至200 μm。 同时该热处理还可显著降低合金的淬火裂纹倾向性, 得到细小均匀的γ +α2全片层组织(FL), 提高铸造合金的室温力学性能。
Abstract: A new heat treatment was developed to investigate the grain refinement of as-cast Ti46Al8Nb alloy. The results indicate that the original coarse grain of 800 μm and stable as-cast grains can be effectively refined to 200 μm by heating to 1 360 ℃ and then quenching into 900 ℃ molten salt, followed by the annealing and normalizing treatment. Such heat-treatment leads to the formation of a fully lamellar microstructure with refined grain size consisted of the γ and α2 phases. Besides, quenching into 900 ℃ salt bath reduces the tendency of cracking and mechanical properties at room temperature can be improved.