Fe-Cr-C-Ti堆焊合金组织及耐磨性能
The Microstructure and Wear Resistance of Fe-Cr-C-Ti Handfacing Alloy
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摘要: 采用药芯焊丝气体保护堆焊方法,在Q235钢表面制备不同Ti含量的Fe-Cr-C-Ti系堆焊层金属,利用扫描电镜(SEM)及XRD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,在Fe-Cr-C-Ti耐磨堆焊合金中,随着wTi的增加,合金组织中TiC硬质相增多;当w(Ti)=7.5%时,部分TiC聚集呈雪花状形貌;w(Ti)=5.5%时,合金表现出优良的抗磨损性能.Abstract: Fe-Cr-C-Ti hardfacing alloys with different Ti contents were prepared by gas-shielded flux cored arc welding on Q235 steel.The microstructures were investigated by SEM,XRD and EPMA.The abrasive wear resistance performance of the welded surfacing layers was evaluated on the MLS-225 grain-abrasion testing machine.The abrasive wear mechanics was studied on the observation of surface topography by the micro examination and energy spectrum analysis.It is indicated that with the increasing of Ti content,the content of TiC increases.The carbides distribute more symmetrical,but significantly decrease when Ti content is up to 7.5%.The results show that the alloy with 5.5 %Ti has better wear resistance.
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