B4C含量对堆焊高铬合金耐磨性的影响

Effects of B4C Content on Abrasion Resistance of High Chromium Alloys

堆焊合金中合金元素 Cr 和 V 与堆焊层中的 C 形成 Cr7C3及 VC 等硬质相,在此基础上加入B 元素,形成相应的 TiB2,可进一步增加其硬度和耐磨性；因此,在高 Cr 合金中加入 B4C 制成粉芯,用埋弧焊堆焊的方法得到合金,测量宏观硬度并且观察了显微组织。结果显示,随着 B4C 含量增加,试样中硬质相比例增加,提高了试样的硬度,一定程度上增加了耐磨性（B4C 含量1.5%-3.5%为宜）；但 B4C 含量过高（B4C 含量达到3.0%左右）,晶界偏析加大,易导致堆焊层开裂。

Element Cr and V can formed Cr7C3 and VC hardening phase with C in the surfacing layer,on the basis of that,especially formed TiB2,the hardness and abrasion resistance of high chromium alloys can be increased greatly.This paper mainly analyzed the effects of B4C content on the morphology and hardness by the method of flux-cored wire sub-merged arc welding,and measured macro hardness and observed micro structure.The results showed that the hardness and abrasion resistance increase when the B4C content increases （the suitable content of B4C is 1.5%-3.5%）,but when the content is too high （the content of B4C is about 3.0%）,the crack on high chromium appears.