摘要
采用3000W CO2激光器对12Cr2Ni4A钢渗碳淬火表面进行了激光合金化处理。设计了激光合金化处理的工艺参数,获得了表面光洁、与基材形成良好冶金结合的合金化层。研究了渗碳淬火层激光合金化处理后的组织特性和显微硬度。结果表明,预置TH-2A型C-Si-B-RE合金化涂层的激光合金化能够显著地改善材料组织,显微硬度可达HV0.21150。研究还发现,激光处理后的零件表层与内部没有任何裂纹出现。研究表明,采用合适的材料设计和工艺参数,激光合金化可以有效地强化渗碳淬火零件。进一步为激光熔覆修复渗碳淬火零件提供了基础资料。
Laser alloying was operated on carburize-quenched 12Cr2Ni4A steel using a continuous CO2 laser. Crack free and fine shaped alloying layer which was metallurgically boned with substrate was fabricated with optimization of processing param eters. Both microstructure and distribution of hardness of the material were investigated after laser alloying. The experimental results show that laser alloying with TH-2A type C-Si-B-RE allying material as coat improved the original microstructure evidently, and the highest hardness is proved to be HV021150, much higher than that before laser alloying. All these results show that laser alloying with optimization of material design and processing parameters could be used to strengthen carburize quenched parts, and it is a further step to repairing this kind of parts by laser cladding.
出处
《应用激光》
CSCD
北大核心
2007年第6期441-443,共3页
Applied Laser
