45钢表面激光熔覆Fe基粉末实验研究  

Study of Laser Cladding Fe-Based Powder on 45 Steel Surface

作　　者：牛兴林[1] 张德强[1] 李金华[1] 高奇[1] 

机构地区：[1]辽宁工业大学机械工程与自动化学院,辽宁锦州121001

出　　处：《机械设计与制造》2014年第12期148-151,共4页Machinery Design & Manufacture

基　　金：模具磨破损区域精确建模与修复技术的研究(L2011101);国家科技支撑计划项目(2012BAF12B08-5);汽车零部件数字化设计与制造(辽科发2011 20号)

摘　　要：利用Fe基合金粉末在45号钢表面进行激光熔覆实验,通过对不同工艺参数下的熔覆层宏观外貌、表面硬度、金相组织和显微硬度进行对比分析发现,当工艺参数为:激光功率800W、扫描速度2mm/s、送粉电压12V、搭接率28.5%时,得到的熔覆层表面比较均匀平整光滑,熔覆层组织主要为晶粒尺寸细小均匀的等轴晶,其组织性能较好,熔覆层及界面处无裂纹和气孔出现,基体与熔覆层之间出现了较为明显的白亮层说明两者冶金结合比较牢固,熔覆层显微硬度分布比较均匀并且与基体相比提高了一倍,其表面机械性能得到提升,在工业生产中有着较高的研究应用价值和广阔的发展前景。The 45 steel laser cladding with Fe-based alloy powder was carried out. Through comparing the cladding layer appearance, hardness, metallographic structure and microhardness , it found out the better cladding layer process parameters （laser power： 800W, scan speed：2mm/s, overlap rate： 28.5%, the feeding voltage ： 12V）. The cladding layer it obtained using this parameters is smooth and cladding metallurgical bonding layer is better. Grain size is much smaller and no crack and almost no hole appear. The microhardness of the cladding layer is twice than the 45 steel base. It can improve the suoCace hardness of the base to a large extent. At the same time, the property the base is improved greatly. It has good prospects for development in the industrial production.

关 键 词：45钢 工艺参数 熔覆层形貌 表面硬度 金相组织 显微硬度 

分 类 号：TH16[机械工程—机械制造及自动化]