农机犁铧堆焊组织结构仿生设计与耐磨性

Bionic design of overlying structure of plough share and its wear resistance

摘要: 为了提高农机犁铧使用寿命，寻求与蜣螂体表的微结构形态相似的堆焊微观组织结构。设计Fe-Cr-C-（B4C）x系金属粉芯焊丝，通过B4C添加量的变化调控堆焊层微观组织结构向蜣螂体表的表面微结构变化。采用CO2气体保护焊进行往复摆动堆焊，观察堆焊层显微组织结构，并进行了EBSD相分析，测定了堆焊层HRC和磨粒磨损性能。结果表明，堆焊层组织为马氏体、下贝氏体及网状（Cr，Fe）3（B，C），并含有少量硬质点TiC。得到的微观组织结构达到了蜣螂体表的微结构形态仿生效果，并且使堆焊层耐磨性均高于65Mn钢3~4倍。

Abstract: In order to improve the working life of plough share and get a overlying micro-structure like dung beetle，Design a metal powder cored wire of Fe-Cr-C-(B4C)xwas designed，which that can control the variation of microstructure from overlying to dung beetle by adjusting addition of B4C．The characteristics of microstructure of the deposited layer prepared by CO2gas shielded welding were studied though scanning electron microscopy and EBDS，and the hardness and the abrasive wear resistance were measured．It is found that the microstructures of the deposited layer are martensite，lower bainite，net-like(Cr，Fe)3(B，C)and a little of TiC．The microstructure is similar to that of dung beetle and the abrasive wear resistance is 3 ～4 times than that of 65Mn steel．