采用1Cr11Ni2W2MoV合金对1Cr12Ni3MoVN热强马氏体不锈钢铸件的槽缺陷进行了激光修复(LR)研究。激光修复区(LRZ)的组织主要为马氏体和回火马氏体,修复区与铸件基体实现了致密的冶金结合,热影响区(HAZ)内发生了不同程度的淬火。硬度值由修复区向基体区(SZ)逐渐减小,在熔合线近基体区出现硬度峰值。室温静载拉伸性能测试结果表明,激光修复区的抗拉强度为1280-1380 MPa,激光修复试样的抗拉强度达到965-980 MPa,断裂均发生在铸件基体。

In the present paper,1Cr12Ni3MoVN alloy was repaired by laser repair (LR) with 1Cr11Ni2W2MoV. A very good metallurgical bond between the repaired zone and the substrate was achieved. The microstructure of the laser repaired zone (LRZ) is composed by martensite and tempered martensite,and a quenching phenomenon was observed in heat affected zone (HAZ). Micro-hardness values decreased from LRZ to substrate zone (SZ),the maximum value happened in the HAZ close to the melting line. The results of room temperature tensile tests show that the strength of LRZ is 1280-1380 MPa,while the strength of laser repaired sample is 965-980 MPa. Fractures were observed on casting substrate during tensile test.