摘要
采用Laserline-LDF3000半导体光纤耦合激光器,对球墨铸铁和灰铸铁进行表面硬化处理,分析工艺参数对激光硬化层深度、硬度及组织特征的影响,比较了两种铸铁的硬化能力。结果表明,相同能量密度下,球墨铸铁的总硬化层深度大于灰铸铁;表面仅有微熔时两种铸铁的总硬化层深度基本相同,在0.8 mm左右。影响铸铁激光硬化层深度的因素主要是工艺参数和材料导热系数,球墨铸铁硬化层深度与激光能量密度之间呈近似线性关系;灰铸铁因导热性好,二者之间不具有线性关系。激光硬化后球墨铸铁硬化层表面硬度(55~60 HRC)高于灰铸铁(45~50 HRC),且工艺参数对硬化层表面硬度影响较小;球墨铸铁激光硬化能力高于灰铸铁。
Laserline-LDF3000 fiber-coupled semiconductor lase was used to harden the surface of nodular cast iron and gray cast iron.Effect of laser processing parameters on microstructure,depth and hardness of hardened layer was studied,and the hardening ability of the two types of cast irons was compared.The results show that at the same energy density,the hardened layer depth of the nodular cast iron is higher than that of the gray cast iron,and the depth of the hardened layer of the two types of cast irons with only slight melting on the surface is basically the same,around 0.8 mm.The main factors affecting the hardened layer depth of the tested cast irons are process parameters and material thermal conductivity.The hardened layer depth of the nodular cast iron has an approximate linear correlation with the energy density,but no linear relationship exists between them for gray cast iron because of its higher thermal conductivity.The surface hardness of the nodular cast iron(55-60 HRC)is higher than that of the gray cast iron(45-50 HRC)after laser hardening,and the influence of process parameters on the surface hardness is relatively small.The laser hardening ability of the nodular cast iron is higher than that of the gray cast iron.
作者
周显敏
曾大新
杨伟
史秋月
郭大治
Zhou Xianmin;Zeng Daxin;Yang Wei;Shi Qiuyue;Guo Dazhi(School of Materials Science and Engineering,Hubei University of Automotive Technology,Shiyan Hubei 442002,China;Hubei Shiyan Xianfeng Die Co.,Ltd.,Shiyan Hubei 442013,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2024年第12期229-236,共8页
Heat Treatment of Metals
关键词
激光表面硬化
球墨铸铁
灰口铸铁
硬化层深度
硬化能力
laser surface hardening
nodular cast iron
gray cast iron
hardened layer depth
hardening ability
