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采用药芯焊丝明弧自保护方法在模具钢表面制备了耐磨性优良的堆焊合金层。采用光学显微镜、宏观硬度计以及湿砂橡胶轮式磨损试验机等研究分析了Cr_3C_2含量对堆焊层组织与性能的影响。结果表明:Cr_3C_2含量对堆焊层组织影响明显,随着Cr_3C_2含量的增加,减小了合金元素烧损以及基体稀释等,促进了碳化物M_(23)C_6形核与长大。此外,随着Cr_3C_2含量的增加,堆焊层硬度呈递增的变化规律,而堆焊层的相对耐磨性则整体呈先增加后减小的变化规律。当Cr_3C_2含量为8%时,碳化物M_(23)C_6均匀分布于涂层中,耐磨性达到最佳。
Using flux-cored wire Ming arc self-protection method on the surface of the mold steel prepared wear resistance excellent surfacing alloy layer. The effects of Cr 3 C 2 content on the microstructure and properties of overlay were analyzed by optical microscope, macroscopic hardness tester and wet sand rubber wheeled wear tester. The results show that the Cr 3 C 2 content has a significant effect on the surfacing layer structure. With the increase of Cr 3 C 2 content, the loss of alloying elements and the dilution of the matrix are reduced, which promotes the nucleation and growth of M_ (23) C_6 carbides. In addition, with the increase of Cr_3C_2 content, the hardness of surfacing layer increases gradually, while the relative wear resistance of surfacing layer increases first and then decreases. When Cr_3C_2 content is 8%, the carbide M_ (23) C_6 is uniformly distributed in the coating, and the wear resistance reaches the best.