Research on fi ber laser remelting of Cr5 series back-up roll

Cr5钢支承辊激光熔凝强化 Research on fi ber laser remelting of Cr5 series back-up roll 屈岳波 QU Yuebo 1 first-author 赵琳 ZHAO Lin 1 2 张瑞华 ZHANG Ruihua 1 田志凌 TIAN Zhiling 1 2 中国钢研科技集团有限公司 中国钢研科技集团有限公司 China iron & steel research institute group China iron & steel research institute group 钢铁研究总院 钢铁研究总院 Central Iron & Steel Research Institute Central Iron & Steel Research Institute 采用光纤激光对Cr5钢支承辊表面进行激光熔凝强化处理,通过组织、显微硬度和耐磨性能分析,研究激光功率和扫描速度对单道熔凝层,以及激光功率和扫描间距对多道熔凝层的影响规律。结果表明,激光熔凝处理显著改善了Cr5钢支承辊的表面性能,单道熔凝层显微硬度可达800HV;多道熔凝的后道激光处理对前道熔凝层存在回火作用,但熔凝层仍具有良好的热稳定性,熔凝层平均硬度约为600～700HV,熔凝试样的磨损量比未经处理的基体减小约10倍,熔凝层耐磨性能明显提升。在本实验条件下,激光功率1.4 kW、扫描速度0.48 m/min、扫描间距2.2 mm时,可较好地兼顾生产效率及Cr5钢激光熔凝层的耐磨性能。 Cr5 series back-up roll was remelted by fiber laser in this study. Through the analysis of structure,micro-hardness and wear resistance,the influence of laser power and scanning speed on single-pass remelted layer,as well as the influence of laser power and scanning distance on multi-pass remelted layer were studied. The result indicates that laser remelting can improve the surface performance greatly,the microhardness reaches 800 HV for single pass processing. The remelted layer has been softened by the later laser pass in the multi-passes processing. But it has good thermal stability,the average microhardness can reach about 600～700 HV,the wear resistance increases about 10 times after the fiber laser remelted. Under this condition of experiment,when the laser power is 1.4 k W,scanning speeding is 0.48 mm/min,scanning interval is 2.2 mm,it has a relatively good production efficiency and wear-resisting performance. Cr5钢 支承辊 激光熔凝 耐磨性能 Cr5 steel back-up roll laser remelting wear-resisting performance TG665;TG333.17 国家重点研发计划资助（2017YFB1103700、2017YFB1103703） 2022-03-08 8 51