摘要
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。
The hard-facing alloy with high wear resistance was prepared on the surface of die steel by flux-cored wire open arc welding. The effects of Cr3C2 content on the microstructure and properties were investigated by optical microscopy,hardness tester and wet sand rubber wheel abrasive tester. The results show the effect of Cr3C2 content on the microstructure and properties is significant. The effect of dilution rate and burning loss of alloy element decreases with the increase of Cr3C2 content, resulting in promoting nucleation and growth of carbide M（23）C6. In addition, the hardness increases with the increase of Cr3C2 content while the relative wear resistance increases at first and then decreases. When Cr3C2 content is 8%, the wear resistance is the best, which is corresponding to carbide M（23）C6 distributing uniformly in the hard-facing alloy.
出处
《热加工工艺》
CSCD
北大核心
2016年第5期227-229,共3页
Hot Working Technology
关键词
汽车模具
堆焊
耐磨性
Cr3C2含量
automobile mold
hard-facing
wear resistance
Cr3C2content
