45^#钢宽带激光淬火研究  

Quenching of 45# steel with a wide-band CO2 laser beam

作　　者：梁二军[1] 杜利平[1] 雒江涛[1] 郭洪[1] 

机构地区：[1]郑州大学河南省激光应用技术重点实验室,郑州450052

出　　处：《激光杂志》2001年第2期52-54,共3页Laser Journal

基　　金：教育部留学回国人员基金;河南省高校创新工程基金;河南省杰出人才创造基金资助项目

摘　　要：:本文利用宽带CO2 激光束 ,对 45 #钢表面进行宽带淬火 ,获得单道淬火宽度 10mm以上。淬硬层硬度达 5 0 0～ 6 30Hv0 3是非淬硬层的 2～ 2 5倍 ,深度达 1 9～ 2 .0mm。激光淬硬层分为表面过热区、均匀相变区和过渡区三个区域 ,所对应的金相组织分别为高碳马氏体、隐晶马氏体和混和马氏体。宽带激光淬火造成的组织细化和大量高碳马氏体的形成是硬度提高的主要原因。在扫描速度v =4mm/s和离焦量 18mm条件下 ,45 #钢宽带激光淬火的最佳功率约为 3 0～ 3 3kW。The surface quenching of 45 # steel is carried out with a wide band CO 2 laser beam.Single quenching width larger than 10mm is obtained.The microhardness is 2～2.5times as high as the unquenched area which reaches 500～630Hv 0.3 while the depth of the hardened layer reaches 1.9～2.0mm.Both the microhardness and the microstructure distribution within the hardening layer indicated that the hardened layer consists of three sub layers,overheated surface layer,uniform phase transformation layer,and transition layer.The corresponding microstructures are highcarbon martensite,hidden crystal martensite and mixed martensite.The elevation of the hardness is attributed to the refining of the crystalline and the formation of the high carbon martensite during laser quenching.With v=4mm/s and off focus length 18mm,the optimal laser power lies between 3kW and 3.3kW.

关 键 词：宽带激光淬火 二氧化碳激光 45^#钢 

分 类 号：TG161[金属学及工艺—热处理]