期刊论文

Microstructure and properties of laser clad layer on high strength stainless steel

中文

金属热处理

0254-6051

2021

46

10

232-236

10.13251/j.issn.0254-6051.2021.10.042

衡阳市科技计划（2019jhzx0622）；

本校为第一机构

针对核装备零部件维修再制造的需要,采用激光熔覆技术制备高强韧马氏体不锈钢熔覆层,以改善核装备零部件的表面性能,随后对熔覆层试样分别进行300℃和500℃保温2 h的回火处理。采用OM、SEM、显微硬度计、万能拉伸试验机等设备测试了试样的组织和性能。结果表明,原始试样的抗拉强度为1719 MPa,断后伸长率在15%左右,硬度为550 HV0.2,耐磨性较差;当回火温度为300℃时,出现逆转变奥氏体,硬度降至500 HV0.2,抗拉强度降为1662 MPa,断后伸长率超过15%,耐磨性提高;当回火温度上升到500℃时,逆转变奥氏体减少,碳化物逐渐析出,出现二次硬化,硬度又上升至530 HV0.2,抗拉强度降至1582 MPa,断后伸长率降至14%...

In response to the need for repair and remanufacturing of nuclear equipment parts, the laser cladding technology was used to prepare the clad layer of high-strength and tough martensitic stainless steel for improving the surface properties of nuclear equipment parts, and then the clad layer specimens were tempered at 300 ℃ and 500 ℃ for 2 h. The microstructure and properties of the specimens were tested by means of OM, SEM, microhardness tester, universal tensile testing machine and other equipment. The results show that the original specimen...