摘要
利用热压缩法研究了TC18合金的热变形行为,并利用TEM和EBSD研究了热压缩过程的显微组织演化。结果表明,TC18合金650℃流变曲线呈现单一峰值的动态再结晶特征,变形温度的提高使单一峰值的特征逐渐减弱直至消失。650℃,0.001 s-1时出现大量细小的再结晶晶粒,说明这时以再结晶为主;温度提高到810℃时,出现了规则的位错列和位错胞及介于位错胞之间的无位错区,说明这时出现回复和再结晶共存的现象。EBSD观察结果表明,在各个变形条件下β相亚结构比例都要高于α相,说明β相比α相更易发生回复现象;随变形温度提高和变形速率降低,β相发生回复的体积分数增加。
The deformation behavior of TC18 alloy was studied by hot compressive deformation method,as well as the microstructure evolution was studied by TEM and EBSD. The results show that flowing curves at 650 ℃ show the recrystallization characteristics with single peak,the increase in deformation temperature the characteristics of single peak weakens and disappears gradually. A lot of recrystallization grains with small size can be observed at 650 ℃ and strain rate of 0. 001 s- 1. Regular dislocation lays,as well as dislocation cells and the zone without dislocation among dislocation cells can be found at 810 ℃,it is indicated that recovery and recrystallization is coexistence. The EBSD shows that the sub-structures ration in β phase is larger than that in α phase,showing that β prefers to recovery. With the temperature increasing and deformation rate decreasing,the recovery ratio in β phase increases.
出处
《金属热处理》
CAS
CSCD
北大核心
2014年第7期59-62,共4页
Heat Treatment of Metals
基金
山西省高等学校科技创新项目(20091159)
关键词
TC18钛合金
热压缩行为
组织
TC18 alloy
hot compressive behavior
microstructure
