关键词: 超高强度钢, 激光辐照, 显微组织, 疲劳性能

Abstract: The research in this paper is on laser radiaton with different parameters to 30CrMnSiNi2A steel hole plates and slot plates, and fatigue properties, microstructure and hardness distribution in the hardening zone are analyzed. The results demonstrate that the nature of laser transformation hardening is still a martensitic transformation and its speciality is its super-refined structure. The tests also show that some incorrect technologies can result in obvious decrease of fatigue lives, bad microstructure and disadvantage of hardness distribution in the hardening zone. When the surface of the steel is strengthened by the laser radiation , the high temperature tempered layer is unavoidable to lower the fatigue strength. It is only when the parameter of laser radiation is correct that it can increase the fatigue life of 30 CrMnSiNi2A low alloy super-strength steel.

Key words: supe-strength steel, laser radiation, microstructure, fatigue property