油压减振器活塞杆表面激光熔覆不锈钢的组织与性能

doi:10.13251/j.issn.0254-6051.2023.06.036

摘要/Abstract

摘要： 采用HP-115型五轴激光增材制造系统和两种不锈钢合金粉末对油压减振器活塞杆表面进行了激光熔覆修复。利用着色渗透探伤、金相显微镜和显微硬度计等表征方法分析了不锈钢熔覆层的熔覆质量、微观组织和显微硬度, 并利用盐雾试验箱对熔覆层的耐蚀性能进行了研究。结果表明, 两种不锈钢合金粉末激光熔覆层质量良好, 熔覆层和热影响区厚度分别约为0.65 mm和0.5 mm, 其显微组织主要包括细小的等轴晶和树枝晶、粗大的胞状晶以及平面晶;不锈钢粉末12.43%Cr和16.26%Cr激光熔覆层平均显微硬度分别为729 HV0.3和617 HV0.3, 与基材(250 HV0.3)相比有较大幅度提高, 且不锈钢粉末12.43%Cr激光熔覆层的显微硬度达到了油压减振器活塞杆表面涂层对硬度的要求。与基材相比, 两种不锈钢合金粉末激光熔覆层均具有较好的耐蚀性。

关键词: 激光熔覆, 不锈钢熔覆层, 微观组织, 显微硬度, 耐蚀性

Abstract: Two stainless steel powders were used to repair the surface of oil damper piston rod by laser cladding with HP-115 five-axis laser additive manufacturing system. The cladding quality, microstructure and microhardness of the stainless steel clad layer were analyzed by means of dye penetrant inspection, OM and microhardness tester. The corrosion resistance of the clad layer was studied by means of salt spray test chamber. The results show that two kinds of the clad layers are of good quality. The thickness of the clad layer and the heat-affected zone is about 0.65 mm and 0.5 mm, respectively. The microstructure of the clad layer mainly includes fine equiaxed and dendritic crystals, coarse cellular crystals and planar crystals. The average microhardness of 12.43%Cr and 16.26%Cr laser clad layers is 729 HV0.3 and 617 HV0.3, respectively, which is significantly improved compared to 250 HV0.3 of the substrate, and the microhardness of stainless steel powder 12.43%Cr laser clad layer meets the hardness requirements of the surface coating of oil damper piston rod. Compared with the substrate, both types of the stainless steel alloy powders laser clad layers have better corrosion resistance.

Key words: laser cladding, stainless steel clad layer, microstructure, microhardness, corrosion resistance

中图分类号:

TH142

史耀君, 周华杉, 孙华, 夏少华. 油压减振器活塞杆表面激光熔覆不锈钢的组织与性能[J]. 金属热处理, 2023, 48(6): 202-205.

Shi Yaojun, Zhou Huashan, Sun Hua, Xia Shaohua. Microstructure and properties of laser clad stainless steel on surface of oil damper piston rod[J]. Heat Treatment of Metals, 2023, 48(6): 202-205.

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