摘要
利用可控冷却速率热处理装置对TA15钛合金进行了不同冷却速率下的β热处理工艺试验,研究了该合金冷却速率对微观组织和硬度的影响。结果表明:合金加热至1 020℃以上以不同冷却速率冷却后出现了两种类型的转变产物——马氏体和(α+β)片层组织;两种类型转变产物中的原始β晶粒形貌均清晰可见;(α+β)片层组织中α片终止于原始β晶界和其他α集束团,原始β晶粒内可形成多个α集束团,同一α集束内α片层相互平行;随冷却速率增加,α片层厚度先快速后缓慢减小,而集束尺寸则呈线性减小;增加冷却速率可提高(α+β)片状组织的硬度。
β heat treatment with different cooling rare of titanium alloy TA15 were conducted on a heat treatment machine with controllable cooling rate. The effect of the cooling rate on the microstructure and hardness is investigated. The results indicate that two types of transformation products of martensite and（ α ＋ β） lamellae microstructure were observed when the alloy was heated to the temperature of the beta phase transition point,and then cooled at different cooling rate. The original beta grain morphology in the transformation products is visible. The α plate of（ α ＋ β） lamellae microstructure terminates at original β grain boundaries and other α cluster,which results in multiple α cluster with the same α plate orientation in original β grain. With the increase of cooling rate,the α plate thickness decreases rapidly firstly,and then decreases slowly,while the α cluster size decreases linearly. The increasing of hardness of（ α ＋ β） lamellar microstructure with increasing the cooling rate is observed.
出处
《失效分析与预防》
2016年第4期208-211,217,共5页
Failure Analysis and Prevention
基金
国家自然科学基金(51261020)
江西省教育厅科技项目(GJJ14505)
