摘要
采用Gleeble高温压缩实验研究了变形条件对GH625合金高温变形动态再结晶的影响,结果表明:当变形程度较小时,原始晶粒内部出现大量孪晶,晶界呈现锯齿状凸出;随变形程度的增加,在晶界弓出部位开始形核,形成大量再结晶晶粒,随变形程度进一步增加,GH625合金动态再结晶体积分数增大,但是再结晶晶粒尺寸无明显变化;GH625合金动态再结晶是一个受变形温度和应变速率控制的过程,变形温度越高,动态再结晶越容易形核,应变速率越小,动态再结晶过程进行得越充分。在低应变速率条件下,GH625合金获得完全动态再结晶组织的温度随变形速率的升高而升高,而在高应变速率条件下必须考虑变形热效应对合金变形组织的影响。
Effects of deformation process on dynamic recrystallization of GH625 Nickel-based alloy were studied by isothermal compression test conducted on a Gleeble-1500D simulation machine.The results showed that there were a large number of twins and serrated protrusions appeared at the grain boundary when deformation was within a small scale,while some larger crystalline grain could be found in the protrusions spreading out of the grain boundary when deformation scale increased.When deformation continued to increa...
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2010年第6期833-838,共6页
Chinese Journal of Rare Metals
基金
国家自然科学基金和宝山钢铁股份有限公司联合资助(50834008)资助
关键词
GH625合金
热变形
动态再结晶
变形热效应
GH625 alloy
hot deformation
dynamic recrystallization
deformation thermal effects
