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对堆焊焊条中加硼、钛所引起堆焊金属各性能指标变化,进行了初步研究,试验表明: (1)用正交、回归程序配方,找到最佳合金系统为C-Cr-Mo-W-Ti-B。(2)硬度分析:含Ti、B比例适当,堆焊层硬度可达HRC62～65。(3)胶轮磨粒磨损:ε-24.8,相对于45~#钢,硼对耐磨性影响最大,一般取0.8%B,综合性能较好。(4)超高温金相显微硬度及金相分析:堆焊金属中碳、硼有晶累偏聚趋势,二次TiC和硼化物共晶的产生,首先出现于晶界,随合金含量提高、高温红硬性提高。(5)扫描电镜配合能谱分析:堆焊层组织为细针马氏体+碳、硼化物+微量残余奥氏体组织。耐磨性高,且抗裂性能好。
The results show that: (1) The optimum alloy system is found to be C-Cr-Mo- W-Ti-B. (2) hardness analysis: Ti, B ratio is appropriate, surfacing layer hardness up to HRC62 ~ 65. (3) Abrasive wear of rubber wheel: ε-24.8, relative to 45 ~ # steel, boron has the greatest impact on wear resistance, generally 0.8% B, the overall performance is better. (4) Ultrahigh temperature metallographic microhardness and metallographic analysis: the tendency of the crystal and the cumulative segregation of carbon and boron in the deposited metal is secondary and the secondary TiC and boride eutectic occur first in the grain boundaries. With the increase of the alloy content, the high temperature Hard to improve. (5) Scanning electron microscopy coupled with energy spectrum analysis: surfacing layer microstructure of fine needle martensite + carbon, boride + trace retained austenite. High abrasion resistance and good crack resistance.