半钢轧辊表面等离子束合金化强化试验研究

摘要

The plasma beam surface alloying technology was used to strengthen the semi-steel roll. The microstructure was investigated by using the optical microscope, scanning electron microscope and microhardness tester. The microstructure of the alloyed layer at room temperature is austenite and eutectic carbides, the average hardness of the alloyed layer is HV0.2450 while the average hardness is HV0.2550 and the microstructure is tempered martensite and austenite after heating at 600 ℃for 4 h. The field-installed rolling test for two trips(16 h)shows that the performance of the surface alloyed semi-steel roll is improved.%文中采用等离子束合金化技术对半钢轧辊进行强化研究，使用金相显微镜、环境扫描电镜、显微硬度计测试了合金化层的显微组织和硬度。室温下合金化层组织主要由奥氏体和共晶碳化物组成，合金化层经过600℃保温4 h处理后，组织主要为回火马氏体和残余奥氏体。显微硬度测试表明合金化层的室温平均硬度为HV0.2450，600℃4 h回火后合金化层平均硬度为HV0.2550；经过现场装机轧制2个班次（16 h）对比试验表明，合金化后的半钢轧辊综合性能获得提高。