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为了提高高锰钢堆焊层在中低载荷作用下的耐磨性,在D256焊条药皮中分别加入一定量的石墨和碳化硼,固定钛铁、钒铁和稀土的含量,利用焊接冶金反应在高锰钢堆焊层中自发生成硼化物和碳化物增强颗粒以提高其耐磨性。采用XJL-2型金相显微镜、HR-150A型洛氏硬度计、M-200型磨损试验机等仪器,研究了堆焊层的显微组织和力学性能。结果表明:添加碳化硼的焊条堆焊层的组织主要由奥氏体+大量硼化物和碳化物颗粒组成,当碳化硼含量为6%时,奥氏体晶粒细化程度最好,宏观硬度达到56HRC,其熔合区硬度较加石墨的焊条提高了8HRC,并且其耐磨性也优于后者。
In order to improve the wear resistance of high manganese steel surfacing layer under medium and low loads, a certain amount of graphite and boron carbide were respectively added into the coating of D256 electrode to fix the contents of ferrotitanium, vanadium iron and rare earth, and the welding metallurgy reaction Boron carbide and carbide reinforcing particles spontaneously develop in the high manganese steel surfacing layer to improve its wear resistance. The microstructure and mechanical properties of the overlay were studied by XJL-2 metallographic microscope, HR-150A Rockwell hardness tester and M-200 wear tester. The results show that the microstructure of the surfacing layer of the electrodeposited with boron carbide mainly consists of austenite + a large amount of borides and carbide particles. When the content of boron carbide is 6%, the austenite grain refinement is the best, and the macroscopic hardness Reached 56HRC, the fusion zone hardness than graphite electrodes increased by 8HRC, and its wear resistance is also better than the latter.