TiNbTaZr合金在轧制过程中的马氏体转变

Martensite phase transformation of TiNbTaZr alloy during cold rolling

利用真空自耗熔炼方法和热加工技术制备Ti-35Nb-2Ta-3Zrβ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。

Ti-35Nb-2Ta-3Zr β titanium alloy was fabricated by vacuum consumable arc melting furnace followed by hot pressing. Direct-roUing 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.