论文部分内容阅读
采用药芯焊丝气保焊堆焊方法制备了0.8%~1.6%C(质量分数)的亚共晶Fe-Cr-B-C系耐磨合金,采用光学显微镜,扫描电镜和X射线衍射仪对堆焊合金微观组织和物相进行了分析。结果表明:堆焊合金显微组织是亚共晶组织,由初生γ-Fe枝晶和共晶组织(硼碳化物+共晶基体)组成;元素C能显著增加共晶组织数量,增加共晶组织上共晶基体的尺寸;堆焊合金的耐磨性能主要受作为耐磨骨架的共晶组织数量和形态共同影响,0.8%C堆焊合金的共晶组织数量较少,相对磨损性能仅为9.1;当C含量增加到1.2%时,共晶组织数量明显增加,堆焊合金的磨损性能显著上升至17.2;继续增加C到1.6%时,共晶组织数量最多,但是由于共晶基体尺寸偏大,堆焊合金的磨损性能大幅降低至11.4。
The hypoeutectic Fe-Cr-BC wear-resistant alloy with 0.8% -1.6% C (mass fraction) was prepared by flux gas welding and surfacing welding method. The microstructure of the wear-resistant alloy was studied by optical microscope, SEM and XRD, Alloy microstructure and phase were analyzed. The results show that the microstructure of surfacing alloy is a hypoeutectic structure consisting of primary γ-Fe dendrites and eutectic (boron carbide + eutectic matrix); element C can significantly increase the amount of eutectic and increase eutectic The size of the eutectic matrix on the microstructure; the wear resistance of the surfacing alloy is mainly affected by the number and shape of the eutectic microstructure as the wear-resisting skeleton, the eutectic microstructure of 0.8% C surfacing alloy is less, the relative wear performance is only 9.1; When the content of C increases to 1.2%, the amount of eutectic structure increases obviously and the wear resistance of surfacing alloy increases significantly to 17.2. When the C content increases to 1.6%, the number of eutectic structure is the largest, but due to the size of eutectic matrix Large, wear resistance of surfacing alloys drastically reduced to 11.4.