(上海交通大学 金属基复合材料国家重点实验室，上海 200240)
摘 要: 利用真空自耗熔炼方法和热加工技术制备Ti-35Nb-2Ta-3Zr β钛合金，采用单向轧制和交叉轧制对合金进行冷变形。通过对轧制态试样的微观组织分析，研究不同轧制方式下的马氏体转变特征。结果表明：单向轧制和交叉轧制过程中产生应变诱发马氏体相，随着变形量的增大，马氏体形貌由针状逐渐转变为粗大的变体；交叉轧制更有利于马氏体相的转变，当冷变形量为40%时，马氏体的转变量达到79.63%，并在随后的冷变形过程中，马氏体转变量基本保持不变。
关键字: β钛合金；轧制；马氏体；相变
（State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract:Ti-35Nb-2Ta-3Zr β titanium alloy was fabricated by vacuum consumable arc melting furnace followed by hot pressing. Direct-rolling and cross-rolling were carried out. Microstructure was investigated to study the characterization of martensite phase transformation during direct-rolling and cross-rolling. The results show that stress-induced martensite phase transformation takes place. With the increase of the deformation, the microstructure of martensite phase changes from acicular to variant crossed and cross-hatched. Cross-rolling is propitious to martensite phase transformation. When the deformation reduction ratio is 40%, the amount of martensite phase arrives at 79.63%, which keeps nearly the same with the increase of deformation reduction ratio.
Key words: beta titanium alloys; rolling; martensite; phase transformation
