热处理工艺对矿山机械齿轮钢表面组织和硬度的影响  

Effect of Heat Treatment Process on Surface Microstructure and Hardness of Mine Mechanical Gear Steel

作　　者：朱永丽[1] 林楠[2] 

机构地区：[1]重庆工程职业技术学院机械工程学院,重庆402260 [2]重庆大学材料学院,重庆403000

出　　处：《热加工工艺》2016年第14期236-238,共3页Hot Working Technology

摘　　要：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。The heat treatment of argon and coating combined protection was carried out for mine mechanical gear steel 20Cr2Ni4 to reduce the thickness of decarburized layer and improve the abrasion resistance. By observation of microstructure and test of surface hardness, the results show that the hardness of material after heat treatment increases gradually from surface to inside. The surface hardness is low, but it is still greater than the hardness of the untreated surface. The surface microstructure is ferrite and martensite, the central microstructure is Martensite and Bainite. There is thin total decarburization layer in the material surface. The thickness of total decarburization layer is 0.2 mm after the heat treatment of argon and coating combined protection and it is less than the thickness of total decarburization layer which is 0.3 mm after the traditional heat treatment. Therefore, the heat treatment of argon and coating combined protection can effectively inhibit the decarburization reaction.

关 键 词：氩气和涂层联合保护热处理 全脱碳层 20Cr2Ni4 

分 类 号：TG161[金属学及工艺—热处理]