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采用氩气和涂层联合保护对20Cr2Ni4矿山机械齿轮钢进行热处理,以减小脱碳层厚度,提高表面耐磨性能。通过组织观察和表面硬度测试,结果显示热处理后的材料硬度由表向里呈先迅速增加后逐渐平稳的趋势,材料表面的硬度较低,但仍大于未经过热处理的表面硬度。材料表面组织为铁素体(F)和马氏体(M),中心组织为马氏体(M)和贝氏体(B)。材料表面存在较薄的全脱碳层。氩气和涂层联合保护热处理的全脱碳层厚度为0.2mm,小于普通热处理的全脱碳层厚度0.3mm。因此氩气和涂层联合保护热处理可以有效地抑制脱碳反应的发生。
Using argon and coating joint protection of 20Cr2Ni4 mine mechanical gear steel heat treatment to reduce the decarburization layer thickness and improve the surface wear resistance. The results of microstructure observation and surface hardness test showed that the hardness of the material after heat treatment rapidly increased from the surface to the surface and then gradually became stable. The hardness of the material surface was lower but still higher than that of the surface without heat treatment. The surface of the material is ferrite (F) and martensite (M), the central structure is martensite (M) and bainite (B). There is a thin, fully decarburized layer on the surface of the material. The thickness of the decarburized layer combined with the heat treatment of argon and the coating is 0.2mm, which is less than the thickness of the decarburized layer of the ordinary heat treatment of 0.3mm. Therefore, argon and coating combined with heat treatment can effectively inhibit the occurrence of decarburization reaction.