Fe-C-Ti-Cr-B系堆焊合金组织及耐磨性能

采用CO2气体保护堆焊方法,在Q235钢表面制备不同硼含量的Fe-C-Ti-Cr-B系堆焊层金属,利用扫描电镜（SEM）对堆焊层的组织进行了观察分析.在MLS-225型湿式橡胶轮磨粒磨损试验机上进行磨粒磨损试验,通过对磨损试样表面扫描电子显微镜观察分析并结合能谱成分分析探讨了磨损机理.结果表明,Fe-C-Ti-Cr-B耐磨堆焊合金中随着硼含量增加,基体组织逐渐细化,TiC颗粒数目增多且分布弥散均匀,但当硼含量增大至1.16%时,磨损面上大量碳化物剥落,抗磨损性能降低;当硼含量为0.55%时合金表现出优良的耐磨损性能,其耐磨性比未加硼的Fe-C-Ti-Cr系堆焊合金提高了3.7倍.

Microstructure and wear resistance performance of Fe-C-Ti-Cr-B hardfacing alloy

In this paper Fe-C-Ti-Cr system alloys with different B contents were prepared on Q235 steel by CO2 gas shielded flux cored arc welding method.The microstructure of the Fe-C-Ti-Cr-B alloys were analyzed by scanning electron microscopy(SEM).The abrasive wear resistance performance of the overlayer was evaluated on MLS-225 abrasion testing machine.The mechanism of wear resistauce was studied by the observation of attrited surface topography with SEM and energy dispersive spectrometer(EDS).The results are presented as follows: with the B element increasing,TiC particles distributed more symmetrical and the number of the second phase and hardness of the alloy also increased.When the B content increasesd to 1.16%,a large number of carbides were flake away from the wear surface.The alloy with 0.55% B content exhibits excellent wear resistance,that is 3.7 times better than those without B.