碳化硼对自生颗粒增强奥氏体堆焊层组织
Influences of B4C on Microstructure and Mechanical Properties of Austenitic Hardfacing Layer Enhanced by Autogenous Particles
时海芳， 杨海艳， 高 山， 李 梅
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作者单位：辽宁工程技术大学 材料科学与工程学院， 辽宁 阜新 123000
中文关键字：自生硼化物； 堆焊； 耐磨性
英文关键字：autogenous boron carbide; surfacing; wear resistance
中文摘要：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。
英文摘要：In order to improve the hardfacing layer of high manganese steel under low load wear resistance, a certain volume of graphite and carbonization boron was added into D256 electrode medicine skin and fixing ferrotitanium, ferrovanadium and rare earth content. Due to welding metallurgy reaction, the wear resistance of reinforcing particles in high manganese steel hardfacing layer can be improved by generating boron carbide and carbon, the mechanical properties of the hardfacing layer with abrasion tester, such as XJL-type 2 metalloscope, HR-150A type los hardometer, M-200 type instruments, were studied. The results show that the microstructure of the hardfacing layer with boron carbide is mainly composed of austenitic+carbide. When the boron carbide is 6%, the refinement level of austenitic grain is best. The microhardness can reach 56 HRC, the microhardness of the fusion zone is 8HRC higher than the welding rod with graphite, the wear resistane is better than the latter.