TC18钛合金固溶时β晶粒的长大规律

β Grain Growth Rule of TC18 Titanium Alloy during Solid-Solution

摘要: 在β单相区对TC18钛合金进行了固溶处理, 研究了固溶温度及保温时间对β晶粒尺寸的影响。结果表明: 固溶温度越高, 保温时间越长, β晶粒的尺寸越大, 但晶粒长大速率随保温时间的延长而逐渐减慢; 通过回归分析建立了β晶粒尺寸与固溶温度和保温时间之间关系的回归方程; 保温时间较短时, 热力学因素和动力学因素共同影响晶粒的生长过程, 随保温时间延长, 动力学因素的影响逐渐减小。

Abstract: TC18 titanium alloy was solid-solution treated in the β phase region, and the effects of solid-solution temperature and holding time on the size of β grain were studied. The results show that the size of β grain increased with increase of solid-solution temperature and holding time, but the growth speed of the grain decreased with increase of holding time. Regression analysis was employed to establish regression equation between solid-solution temperature, holding time and the size of β grain. The growth process of grains was affected by thermodynamics and kinetics factors when holding time was shorter, the effect of the former gradually decreased with holding time.