16MnR钢在不同疲劳周次下塑性变形的“原位”背散射电子衍射检测  

"In-situ" EBSD Inspection of Plastic Deformation of 16MnR Steel under Different Fatigue Cycles

作　　者：张鸥[1] 徐学东[1] 张海[1] 安栋[1] 

机构地区：[1]北京工业大学固体微结构与性能研究所,北京100124

出　　处：《理化检验（物理分册）》2013年第1期1-5,10,共6页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：十一五国家科技支撑计划(2006BAK02B02)

摘　　要：利用背散射电子衍射(EBSD)对退火压力容器用钢16MnR在不同疲劳周次下进行"原位"EBSD试验,获得与之对应的晶体取向图。采用局域取向错配角(KAM)的大小及变化定性反映材料疲劳损伤过程中的塑性变形程度。结果发现:疲劳次数与材料塑性变形程度并不是规则的线性关系,疲劳过程存在疲劳硬化导致材料变形速率下降的现象。材料的塑性变形特点表明晶界及微观结构不均匀处是疲劳塑性变形敏感区。The ＂in-situ＂ electron back scatter diffraction （EBSD） experiments were carried out on the annealed pressure vessel steel 16MnR at different fatigue cycles in order to obtain the corresponding crystal orientation maps. Kernel average misorientation （KAM） value and diversification qualitatively described plastic deformation in the process of fatigue damage. The results showed that it was not inerratic linear relationship between the fatigue cycles and plastic deformation of material, but there was fatigue hardening in the fatigue process that caused material deformation rate becoming slow. Plastic deformation features showed that the grain boundaries and uneven microstructure sections were plastic deformation sensitive areas.

关 键 词：16MNR钢 背散射电子衍射 局域取向错配角 疲劳损伤 塑性变形 

分 类 号：TG142.1[一般工业技术—材料科学与工程]