激光熔凝和熔敷在热轧辊强化中的应用  

Applications of laser melting and cladding to hot rolls

作　　者：张来启[1] 陈光南[2] 杨王玥[1] 孙祖庆[1] 樊子力[3] 牟文恒[3] 李克敏[4] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]中国科学院力学研究所,北京100080 [3]唐山钢铁集团有限公司带钢厂,河北唐山063100 [4]唐山钢铁集团有限公司高速线材厂,河北唐山063000

出　　处：《天津工业大学学报》2003年第5期69-71,75,共4页Journal of Tiangong University

基　　金：中国科学院应用研究与发展重大项目(KY951-A1-601-03).

摘　　要：为提高热轧辊寿命对球墨铸铁、白口铸铁热轧辊进行了激光熔凝、熔敷实验研究,并对激光处理效果进行了现场轧制实时寿命评估.研究确认:球墨铸铁、白口铸铁激光熔凝小样的硬度随扫描速度的降低和激光功率的增大而提高.分别按轧钢量、磨损量计算,球墨铸铁、白口铸铁激光熔凝热轧辊寿命分别比原来延长50%和15.6%～23.4%.利用激光熔敷技术在白口铸铁热轧辊上可以成功制备无宏观裂纹、气孔和夹杂存在的镍基合金涂层.现场轧制后表面也无宏观缺陷存在,寿命延长18.7%～37.4%.In order to lengthen the lifetimes of hot rolls, the laser melting and cladding of the hot rolls of spheroidalgraphite and white cast irons were investigated, and lifetimetests of laserprocessed rolls on realtime by online rolling were evaluated. The hardness values of lasermelted samples of spheroidalgraphite and white cast irons increase with the decrease of scanning velocity of laser beam and with the increase of laser power respectively. The lifetimes of the lasermelted hot rolls of spheroidalgraphite and white cast irons have increased by 50% and 15.6%23.4% according to the amount of rolled steels and their wear thickness respectively. Nickelbased alloy coating which is free of macrodefeets of cracks, pores, inclusions,etc. can be fabricated on the substrate of hot rolls of white cast irons by means of laser cladding technique. Also, there are not any macrodefects on their surfaces after rolling, and their lifetimes have increased by 28.7%37.4%.

关 键 词：激光熔凝 激光熔敷 热轧辊 表面硬度 实时加工 

分 类 号：TG156.99[金属学及工艺—热处理]