摘要
研究了低碳钢在低周冲击疲劳循环形变阶段的晶界行为用扫描电子显微镜对试样表面进行了观察，结果表明晶界表现出如下特征：滑移线既可连续地跨越晶界，也可受阻于晶界井形成台阶；晶界发生诸如增粗、消失等现象；伴随着形变过程，出现新的亚晶界；晶界既阻碍滑移。
An examination of grain boundaries behaviors of a low carbon steel during cyclic deformation under impact fatigue loading has been carried out. A slip Hopkinson bar was used for impact fatigue test and the surface evolution of the post test specimen was observed by SEM. The following characteristics of impact fatigUe grain boundaries behaviors were revealed: (1) Some new sub-grain boundaries are produced; (2) Some of grain boundaries become wide and some become fine to disappear; (3) On the one hand grain boundaries allow that slip bands run continuously across them, on the other hand grain boundaries obstruct slip bands so as to form grain boundary steps; (4) Grain boundaries also activate second slip system within a grain. The possible mechanisms of these phenomena were discussed.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第7期703-706,共4页
Acta Metallurgica Sinica
基金
江西省自然科学基金
关键词
冲击疲劳
循环形变
晶界
低碳钢
impact fatigue
cyclic deformation
grain boundary
