作　　者： (马伯江）; (卜凡宁）; (杨广蕾）; (曹同坤）;

机构地区： 青岛科技大学机电工程学院,山东青岛266061

出　　处： 《焊接》 2017年第8期10-13,共4页

摘　　要： 针对刀具如农用碎草刀、灭茬刀、豆浆机刀片和谷粒粉碎刀等在使用过程中会逐渐钝化、不能自锐的难题,在65Mn表面钎涂Ni基和WC的混合粉末制作刀刃单面涂层的刀具,通过不同的热处理方法改变基体组织,调节刀刃两侧的耐磨性差,研究单面涂层刀具的自锐性。测量砂砾磨损测试(100 h)后刃部曲率,分别为500μm,120μm,147μm。结合磨损量分析400℃回火处理的刀具在耐磨性、自锐性和使用寿命三个方面的综合性能优越,提高刀具的使用寿命。 Tools such as agricultural grass cutter,stubble blade,soymilk blade and grain crushing knife would get passivated gradually during using and could not self-sharpen.In order to resolve these problems,the mixed Ni-based alloy and WC powder was brazed on the 65Mn steel surface to make the single-sided coating of tool.To ensure that the single-sided coating tool can self-sharpen,different heat treatments were used to change the matrix microstructure and regulate the both sides wear resistance of the tool.After 100-hours-grinding tests,the edge curvatures of the samples treated by normalization,quenching and tempering are 500μm,120μm,147μm,respectively.The tool after 400℃tempering has excellent wear resistance,self-sharpening,so it can significantly improve the service life of the tool.

关 键 词： 碳化钨 表面钎涂 自锐性 使用寿命