摘要
在500℃采用等径角挤压工艺ECAP)制备亚微晶45钢,运用光学显微镜、透射电子显微镜等研究了变形过程中渗碳体的溶解与球化行为。结果表明:ECAP变形过程中片层状的渗碳体发生了剧烈的弯曲、拉伸、扭折、剪切或切断变形,从而变薄、剪断、碎化或在其内部及外表面引入大量的缺陷,导致其处于高能不稳定状态,促进了渗碳体的溶解;剪断和碎化的渗碳体外部各处的曲率各不相同,导致渗碳体逐渐球化。
A submicrometer grained 45 steel was prepared by equal channel angular pressing （ECAP） technology at 500℃. The behavior of cementite dissolution and spheroidization during ECAP process was studied by optical microscopy and transmission electron microscopy. The results show that the deformation modes of lamellae cementite included bending, tensing, kinking, shearing and shearing fracture during ECAP process, Cementite attenuation, shearing, refinement or a large number of defects on the surface promoted the cementite dissolution due to thermodynamical unstability. The cementite spheroidization was due to the different curvature in the outside of sheared and refined cementite.
出处
《机械工程材料》
CAS
CSCD
北大核心
2011年第8期26-29,共4页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(59974018)
关键词
45钢
等径角挤压
渗碳体
溶解
球化
45 steel
equal channel angular pressing
cementite
dissolution
spheroidization
