摘要
以DZ40M合金为研究对象,采用金相组织观察和EBSD晶粒取向分析技术,分析了DZ40M合金的再结晶形核位置与形核后的晶粒取向之间的关系.研究表明:DZ40M合金经压痕变形后,在退火过程中发生的再结晶晶粒主要在初生碳化物周围和枝晶间形核;初生碳化物处形核的再结晶晶粒主要位于〈112〉取向上,而枝晶间形核的再结晶晶粒为〈110〉取向.合金中的二次碳化物M23C6在晶界、亚晶界和位错上析出,能够阻碍再结晶核心的形成.当退火温度低于1423 K时,M23C6的析出数量较多,尺寸小且间距小,可以有效地抑制合金的再结晶形核,降低再结晶形核率.
The relationship between recrystallized nucleation location and grain orientation after nuleation in DZ40M alloy was investigated by SEM and EBSD. The results showed that after the deformation by indentation the recrystallized grains during annealing nucleate around the primary carbides and interdendritically in （112） orientation and （110） orientation, respectively. The formation of nucleus of recrystaUization in DZ40M alloy could be prevented by the secondary carbides M23 C6 precipitated at grain/subgrain boundaries and dislocation positions. When the annealing temperature is below 1423 K, the number of M23C6 precipitates increases with small size and spacing to restrain the recrystallized nucleation and decrease its rate.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第2期208-212,共5页
Journal of Northeastern University(Natural Science)
基金
国家重点基础研究发展计划项目(2006CB605005)
