Fe基氩弧熔敷层的组织及性能

Microstructure and properties of Fe-based cladding layer by gas tungsten arc welding

利用正交试验法,经方差分析优化合金粉末配比,采用钨极氩弧熔敷法制备了Fe基熔敷层。利用光学显微镜对熔敷层的组织进行观察分析以及利用显微硬度计对熔敷层的显微硬度进行测试。研究结果表明,熔敷层与基体呈良好的冶金结合,且无气孔和裂纹等缺陷;原位形成的细小硬质颗粒弥散分布在熔敷层中,熔敷层的硬度最高可达HV780,约为基体硬度的4倍。

Orthogonal test method was adopted to prepare Fe-based cladding layer by using gas tungsten arc welding (GTAW) method and by optimizing the alloy powder proportion through analysis of variance. The microstructure and microhardness of the cladding layer were investigated by optical microscope (OM) and microhardness tester respectively. It was indicated that the interface between the cladding layer and the substrate was metallurgically bonded,and the microstructure of the cladding layer was uniform,no pores and cracks were detected. Hard particles obtained by in-situ reaction were dispersed in the cladding layer. The maximum hardness of HV780 was achieved in the cladding layer,which was 4 times of that of the substrate.