期刊论文

Li, B.

中文

金属热处理

0254-6051

2014

39

2

77-81

10.13251/j.issn.0254-6051.2014.02.022

湖南省科技计划项目（2011FJ6060）；

本校为第一且通讯机构

在0Cr18Ni12Mo3Ti不锈钢核阀试样表面进行了 FCo-5合金粉末的单道激光熔覆。研究了熔覆层的显微组织特征、相结构,并讨论了与显微硬度的对应关系。试验结果表明:具有无钨低碳中钴特点的FCo-5合金粉末激光熔覆层与基体达到了良好的冶金结合;熔覆层组织主要为y-Co奥氏体枝晶、枝晶间大量共晶组织及原位生成的Cr_(23)C_6颗粒相;熔覆层横截面显微硬度曲线呈“类M 型”分布,最低硬度值较基体提高了192 HV0.2以上;弥散分布的Cr_(23)C_6颗粒对提高密封面的耐磨性非常有利。FCo-5合金粉末熔敷金属符合核阀密封面堆焊材料的技术要求,可以替代高钴含量的Stellite合金,并有益于减少二次污染、降低核阀成本。...

Single-channel laser cladding of FCo-5 alloy powder was carried out on 0Cr18Ni12Mo3Ti stainless steel nuclear valve specimen surface.The characteristics of microstructure and phase structure of the clad layer were investigated , and a corresponding relationship with the microhardness was also discussed .The experimental results show that the laser clad layer of FCo-5 alloy powder with tungsten-free low carbon moderate cobalt characteristics has achieved a good metallurgical bond with the substrate .Microstructure of the clad layer is mainly com...