摘要
本文以我国自主开发的Zr-Sn-Nb系N18锆合金为研究对象,利用配备在扫描电镜中的EBSD自动分析技术,研究了该合金板材在750℃、780℃、820℃下热轧过程中的晶粒组织、晶界特征及微织构的演化规律。结果表明,N18合金板材在热轧过程中发生了动态回复及局部动态再结晶,并产生了大量的小角度晶界及亚结构等缺陷,且热轧温度越高其动态再结晶晶核的密度越高,缺陷密度有所增加。N18合金板材的织构类型主要为(0002)[12 10]和(0002)[10 10]基面织构以及(10 14)[12 10]锥面织构。热轧样品中观察到了(10 11)[1012]压型孪生,说明压型孪生变形促进了N18合金热轧变形。
The evolution of grain structure,grain boundary characterization and texture were studied by EBSD auto analysis technic in an SEM on N18 plates,which were rolled at 750 ℃,780 ℃,820 ℃ respectively.The results show that dynamic recovery and recrystallization occur during N18 alloy plates hot rolling and a lot of disfigurements such as low angle grain boundaries and sub-structure can be observed.The density of recrystallized nucleation and disfigurements increases with the rolling temperature.The main types of texture in N18 plates are（0002）[1210],（0002）[10 10]basal texture and（1014） [1210]pyramidal texture.Moreover,their density increases during hot rolling in α phase field but decreases in α ＋ β dual phase field.The（1011） [1012]pressure twinning is detected in hot rolling specimens,which illustrates that pressure twinning can promote hot rolling deformation in N18 alloy plates.
出处
《电子显微学报》
CAS
CSCD
北大核心
2010年第5期449-454,共6页
Journal of Chinese Electron Microscopy Society
基金
军工973项目(No.61373)
