摘要
研究了Ti600高温钛合金在固溶处理过程中,不同冷却速率对组织结构的影响及结构与性能之间的关系。重点考察冷却速度对抗蠕变强度的影响,以确定最合适的热处理制度。实验内容包括:观察α片层宽度与晶间α形貌随冷却速度的变化规律;测试不同状态下棒材的高温蠕变性能;分析组织特征与性能之间的相互关系;测定了Ti600合金中硅化物的溶解温度,研究硅化物对合金晶粒尺寸的影响规律。结果表明,在固溶处理过程中,随着冷却速率的增加,α片层宽度减小,硅化物对合金晶粒长大具有明显的抑制作用。当合金在硅化物溶解温度以下进行固溶处理时,其晶粒尺寸的增加比较缓慢,而当固溶温度一旦超过硅化物溶解温度,其晶粒尺寸则迅速增大。研究得出,合金的固溶处理温度处在相变点与硅化物溶解温度之间,合金可获得良好的综合性能。
The influence of solution temperature and cooling rate on the structure morphology in Ti600 alloy were investigated. The changes of α lath width and morphology on the intercrystalline with cooling rate were observed by TEM. The creep performances at high temperature for alloy rods with different heat treatment and the solvability of silicide in Ti600 alloy were also determined. The relationship between creep properties and heat treatment condition of alloy were analyzed. The results show that the alloy grain size was strangely influenced by the silicide solvus temperature. The diffusion, dislocation slip effect the creep performances respectively, The α lath width decreases with the increase of cooling rate. However, the silicon content seems hinders the growth of β grain. When the solution heat treatment temperature is between β transition and silicide solvus temperature, Ti600 alloy possesses excellent creep properties.
出处
《稀有金属快报》
CSCD
2007年第9期19-22,共4页
Rare Metals Letters
基金
国家973资助项目(2007CB613807)
