关键词: 碳钢, 激光相变硬化, 显微组织, 耐磨性

Abstract: This paper deals with the microstructure and the wear resistance of 45-steel after laser transformation hardening.The experimental results show that the hardened zone is composed of three layers:the hardened layer,the partially hardened layer,the transition layer.The hardened layer consists of fine martensites.The partially hardened layer consists of fine martensites and a few bainites.The transition layer consists of martensites and a few carbide-free bainites and some undissociated ferrites.The hardened zone has better plastic deformation resistance and adhesive wear resistance properties that come from the contribution of martensite to strength and hardness of the hardened zone,and the contribution of residual austenite and bainite to toughening of the hardened znoe.

Key words: carbon steel, laser transformtaion hardening, microstructure, wear resistance property