工程金属材料/零件的表面完整性及其断裂抗力  

Surface Integrity and Fracture Resistance of Engineering Metallic Materials and Components

作　　者：王仁智[1] 

机构地区：[1]北京航空材料研究院第四研究室,北京100095

出　　处：《中国表面工程》2011年第5期55-57,共3页China Surface Engineering

摘　　要：工程金属材料的力学性能取决于其显微组织结构。至于对那些由表面起裂引发宏观脆性断裂(诸如疲劳断裂、应力腐蚀与氢脆断裂等)的断裂抗力性能,则首先取决于零件的表面完整性。文中提出了狭义的表面完整性定义,介绍了与这类宏观脆性断裂抗力性能有直接关系的表面完整性参量,诸如表面显微组织结构参量、表面(层)力学性能参量、表面(层)残余应力参量以及表面应力集中参量等。表面强化工艺技术就是通过改变零件表面完整性使这类宏观脆性断裂抗力的性能获得提高。The mechanical properties of engineering metallic materials are depended on the microstructure.The fracture resistance properties induced by the surface cracking on the metallic components,such as fatigue fracture,stress corrosion cracking as well as haydrogen embrittlement fracture,are depended firstly on its surface integrity.The restricted definition of the surface integrity is given and the surface integrity parameters related directly with macroembrittlement fracture resistance properties,such as the surface microstructure parameter,mechanical property parameter in the surface layer,residual stress parameter in the surface layer as well as the surface stress concentration parameter,are discussed.It has been pointed out that the macro-embirttlement fracture resistance can be increased by means of the surface strengthening technology through the change in the surface integrity of the component.

关 键 词：疲劳断裂 应力腐蚀开裂 表面完整性 

分 类 号：TG668[金属学及工艺—金属切削加工及机床] O346.1[理学—固体力学]