硼铸铁等离子相变强化层的组织与性能

Structure and Properties of Plasma Phase Transformation Strengthening Layer of Boron Cast Iron

采用等离子束对硼铸铁进行了表面强化,对等离子强化层的显微组织、显微硬度和耐磨性进行了研究。结果表明:硼铸铁经等离子束淬火处理后,其强化层的组织为隐针马氏体+残余奥氏体+片状石墨+硼化物,硬度为未处理的2￣3倍,强化层的显微硬度随深度呈非线性关系,最高硬度达1 000 HV0.1。且随工作电流的增加,强化层的深度增加,表面硬度下降,次表层硬度增大且硬化层的耐磨性大幅度提高。

Boron cast iron was strengthened by plasma beam, the microstructure and microhardness and abrasion resistance were studied. The results show that the microstucture of hardening layer lousiest of acicular marten site, retained austenite, graphite in fake and boride. The microhardness of strengthening layer shows a nonlinear relationship with the depth, and the maximum microhardness is 1000 HVO.1. The depth and microhardness of strengthening layer is increased, With increasing working elastic current, but the microhardness of the top surface is decreased. The abrasire resistance is increased.