Laser surface alloying was employed to enhance the wear resistance of 304 stainless steel with pure tungsten powder. The effect of laser fluence on phase constituents, microstructure, hardness and corrosion properties was investigated. It is found that the laser fluence has a direct correlation with the phases present in the coatings. Intermetallic Fe7W6 phase was found in the composite coating due to the metallurgical reaction of W with the Fe, Cr and Ni elements in the melting pool. Coatings with composite microstructure in nature were obtained resulting from the dilution of substrate and the laser-induced rapid cooling process. Intermetallic phase of Fe7W6 with solid solution of Ni and Cr shows dendrite or hallo structure depending on the laser fluence. Sintering and/or consolidation of W particles is observed for samples processed with lower laser fluences. It has been found that hardness of the coatings was improved significantly compared with the 304 stainless steel substrate. Coating processed with laser fluence of [Formula: see text] J/m2 shows the best corrosion resistance.

中文翻译：

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304不锈钢钨粉激光表面合金化

采用激光表面合金化技术提高纯钨粉对304不锈钢的耐磨性。研究了激光能量密度对相成分、显微组织、硬度和腐蚀性能的影响。发现激光能量密度与涂层中存在的相直接相关。金属间铁7W6由于 W 与熔池中的 Fe、Cr 和 Ni 元素发生冶金反应，在复合涂层中发现了相。通过基材的稀释和激光诱导的快速冷却过程，获得了具有复合微观结构的涂层。Fe的金属间相7W6Ni和Cr的固溶体显示出取决于激光能量密度的枝晶或空洞结构。对于用较低激光能量密度处理的样品，观察到 W 颗粒的烧结和/或固结。已经发现，与304不锈钢基材相比，涂层的硬度显着提高。用[公式：见正文] J/m的激光能量密度处理的涂层2显示出最好的耐腐蚀性。