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在合金灰铸铁表面预置高镍粉末,采用激光合金化技术进行了制备原位合成颗粒增强复合涂层的研究。在添加强碳化物形成元素和RE_2O_3条件下获得了成形好、无缺陷、与基体形成冶金结合且硬度较低的合金化层。合金化层微观组织呈亚共晶介稳态,由奥氏体、莱氏体及弥散分布的大量复合碳化物颗粒相组成。颗粒相富含Ti、Zr、Mo、W元素,颗粒尺寸3～5μm,颗粒分布密度达6.65×10~3mm~(-2)数量级,合金化层显微硬度平均值约为HV_(0.2)450。
In the alloy gray cast iron surface pre-high nickel powder, the use of laser alloying technology was prepared in situ synthesis of particle reinforced composite coatings. Under the condition of adding strong carbide forming elements and RE_2O_3, alloyed layers with good hardness, no defects and metallurgical bond with matrix were obtained. The microstructure of the alloyed layer is hypoeutectic metastable state, composed of austenite, ledeburite and a large number of dispersed carbide particles. The grain phase is enriched with Ti, Zr, Mo and W elements. The grain size is 3 ~ 5μm, and the grain distribution density is in the order of 6.65 × 10 ~ 3mm ~ (-2). The average microhardness of the alloyed layer is about HV - 0.2 .