Ni-Fe-Cr-C-B合金粉末激光熔覆层的组织及性能

Microstructure and Properties of Layers Fabricated by Laser Cladding of Ni-Fe-Cr-C-B Alloy Powders

利用雾化法制备了合金含量不同的Ni-Fe-Cr-C-B球形粉末,用激光熔覆技术在45基材上制备了熔覆层,并通过X射线衍射、扫描电镜、磨损实验及电化学方法研究了熔覆层的微观组织结构及耐磨和耐蚀性。研究结果表明,所有熔覆层的工艺性很好,没有出现裂纹等缺陷。随着镍含量的增加,熔覆层基体转变为以奥氏体为主的组织,冶金反应形成的析出相分布在晶界上。随着硼元素的增加,析出相尺寸趋于细化,且明显增强了耐磨性和耐蚀性。

This study employs the spray atomization technique to prepare spherical powders of Ni-Fe-Cr-C-B with varying alloy compositions.Laser cladding technology was utilized to create cladding layers on a 45"Steel substrate.The microstructure,wear resistance,and corrosion resistance of the cladding layers were investigated using X-ray diffraction,scanning electron microscopy,wear tests,and electrochemical methods.The results indicate that all cladding layers exhibited excellent processability,with no cracks or defects observed.As the nickel content increased,the microstructure of the cladding layer transitioned to a predominantly austenitic phase,with precipitated phases formed during metallurgical reactions distributed along the grain boundaries.Additionally,the incorporation of boron led to a refinement of the precipitate sizes,significantly improving both wear and corrosion resistance.