摘要
针对激光熔覆修复发动机叶片报废高温锻压模具中使用热喷涂粉末开裂敏感性较大的缺点以及在高温(800℃以上)服役环境中,熔覆层容易开裂、脱落的问题,自配了铁基合金粉末,采用激光熔覆技术,在高温锻压模具表面制备了复合涂层;利用OM、SEM、XRD和硬度计对复合涂层进行表征。结果表明:当自制铁基熔覆粉末的质量百分比为0.5C、25Cr、1.0Ni、1.5Si、1.5B、余量Fe时,获得了无裂纹的熔覆层,熔覆层与基材实现了良好的化学冶金结合。
As to the problems for big cracking susceptibility caused by thermal spraying powders used in the failing aeroengine high-temperature forging mould repaired with laser cladding technology and easy abscission of coating caused in high temperature service environment. The microstructure and properties of coating prepared by laser cladding were studied by means of OM, SEM and XRD. The results show that no cracks coating and excellent chemical metallurgical bonding between cladding coating and substrate are obtained under the condition of optimum formulas （wt1%：0.3C, 25Cr, 1.0Ni, 1.7Si, 1.5B, rest Fe）.
出处
《热加工工艺》
CSCD
北大核心
2009年第16期110-112,共3页
Hot Working Technology
关键词
高温锻压模具
激光熔覆
合金粉末
组织
high-temperature forging mould
laser cladding
alloy powder
microstructure
