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本工作针对高压匀质机柱塞应用背景，在奥氏体不锈钢为基材的柱塞上激光熔覆镍基硬面合金，对其工艺、微观组织结构和性能进行了较深入的分析研究．通过扫描电镜、Ｘ光衍射、金相等微观分析方法，对快速凝固激光熔覆合金层的非平衡态微观组织特性与其性能关系进行研究．结果表明：在激光熔覆柱塞表面获得了镍基硬面合金层与不锈钢基材的优良冶金结合；合金层微观组织为超细的共晶组织，在含Ｃｒ、Ｓｉ、Ｃ、Ｂ元素的过饱和γＮｉ（Ｆｅ）奥氏体基体中，均匀分布着细密的树枝状碳化物、硼化物及硅化物；这是它具有良好的力学性能和耐磨耐蚀使用性能的关键．还对热喷涂柱塞进行了微观组织结构和性能的对比分析
In this work, aiming at the application background of high-pressure homogenizer plunger, nickel-base hard alloy was laser cladded on the plunger of austenitic stainless steel, and its technology, microstructure and properties were analyzed deeply. The relationship between the non-equilibrium microstructure and the properties of the rapidly solidified laser cladding alloy layer was studied by scanning electron microscopy, X-ray diffraction and gold microanalysis. The results show that the microstructure of the alloy layer is ultrafine eutectic structure. The microstructure of the alloy layer is characterized by Cr, Si, C and B elements Supersaturated γNi (Fe) austenite matrix, the uniform distribution of fine dendritic carbide, boride and silicide; This is it has good mechanical properties and wear-resistant corrosion resistance to use the key performance. The thermal spray plunger was also compared microstructure and properties of the comparative analysis