自生碳化物增强高锰钢耐磨堆焊材料的研究.pdfVIP

摘 要 为了提高高锰钢堆焊层在中低载荷作用下的耐磨性，本实验通过制作高锰钢堆焊焊 条，在 D256 高锰钢堆焊焊条药皮中加入钛铁(Fe-Ti)、钒铁(Fe-V)、石墨和稀土元素等， 利用焊接冶金反应在高锰钢堆焊层中自发生成碳化物增强颗粒以提高其耐磨性，优化焊条 药皮成分及配比，初步研制出具有优良耐磨性能的高锰钢自生硬质碳化物堆焊材料。 利用 X 射线衍射、扫描电镜(SEM)、能谱和金相显微镜对堆焊层显微组织、碳化物颗 粒的分布和磨损形貌进行分析；通过硬度实验、磨粒磨损、粘着磨损试验等，探讨焊条药 皮组分钛铁、钒铁的含量和粒度对堆焊层硬度及耐磨性的影响。 研究结果表明：该耐磨堆焊材料的堆焊层组织为奥氏体组织和弥散分布于基体中的硬 质碳化物颗粒，堆焊层硬度达到 HRC65 ，耐磨性优于D256 焊条，含碳化物颗粒的金属堆 焊层具有良好的耐磨损性能，其单位面积磨损质量损失仅为 D256 焊条相应金属堆焊层的 约 1/3，具有较高的耐磨性。 关键词： 自生碳化物；堆焊材料；硬度；耐磨性 - I - Abstract Welding electrode by adding strong elements in the formation of carbon compounds, using arc metallurgy and heat treatment of the role of the subsequent formation of hard carbide particles are dispersed. Diffusion formation of carbide hard particles can not only strengthen the surfacing layer while increasing the wear surfacing layer capacity, but also can reduce the matrix of carbon content, increasing the toughness of the matrix. Using the idea of above ，this article to be based on D256 high manganese electrode components, added the same amount of graphite, rare earth elements and the different iron content and particle size of vanadium, titanium-iron particles, through the arc metallurgical reaction in the Q235-A surfacing, is generated containing vanadium carbide and titanium carbide hard surfacing layer of particles. By HR-150 hardness tester hardness of surfacing layer, using ML-100 type aircraft and abrasive wear and adhesion wear machine M-200 weld overlay wear resistance were investigated. The results indicated that the particle size and concentration of vanadium and iron layer on the welding performance is greatly affected. Electrode surfacing layer compared with the D256, with self carbide har