Q235D多层激光熔覆实验研究  

Research on Q235D Multilayer Laser Cladding

作　　者：张德强[1] 牛兴林[1] 李金华[1] 陈雪叶[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》2016年第4期80-82,共3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：在Q235D钢表面进行多层激光熔覆Fe基合金粉末,实验结果显示基体与熔覆层之间以及熔覆层与熔覆层之间的冶金结合性较好,没有出现裂纹,并且基本无气孔,熔覆层的显微组织、表面硬度和显微硬度均显著优于基体。实验发现,多层熔覆时在不连续加工情况下,随着制备熔覆层数目的增多,在加工新的熔覆层时,之前已经制备完成的各熔覆层的硬度均会有不同程度的降低,并且距离基体越近的熔覆层其硬度降低越多,第一熔覆层显微硬度最低,往上层方向显微硬度逐渐增加,最后一层硬度最高,并且制备的层数越多这种硬度降低程度也会越显著。The Q235D multilayer laser cladding with Fe-based alloy powder was carried out.The results indicated that the metallurgical combination between the substrate and cladding layer was sufficient（i.e.no crack and no hole were appeared）.The microstructure,surface hardness and microhardness of the cladding layer were distinctly better than the ones of the basis material. It was found that the hardness of the different cladding layers was decreased in different degrees with the increase in the number of cladding layer when the process was not continuous. The hardness of the cladding layer which was near the body was obviously decreasing. And the hardness of the first cladding layer was the lowest of all the cladding layers. The hardness of the cladding layer was increasing gradually from the first cladding layer to the last. The last cladding layer had the highest hardness. The more the cladding layers were made,the lower the hardness would be.

关 键 词：Q235D 多层熔覆 外观形貌 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]