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采用药芯焊丝氩弧堆焊方法在低碳钢表面制备了以Fe-Al为基、添加Cr3C2p的堆焊层。利用Nikon金相分析系统、扫描电镜、X射线衍射仪、显微硬度计和销盘磨损试验机对堆焊层组织结构和性能进行了分析测试。结果表明,药芯焊丝中的Fe粉、Al粉和Cr3C2P粉经过氩弧加热、熔化和冷却结晶后形成了FeAl、Fe3Al、FeCr、Cr7C3相,堆焊层中也存在部分未全部熔化的Cr3C2p。Cr3C2p/Fe-Al堆焊层的耐干摩擦磨损性能和在650℃时的抗氧化性能均高于2Cr13型的D517焊条堆焊层。
The surfacing layer with Fe-Al as base and Cr3C2p as base was prepared on the surface of mild steel by argon arc surfacing method of flux-cored wire. The microstructure and properties of the overlay were analyzed by Nikon metallographic analysis system, scanning electron microscopy, X-ray diffraction, microhardness tester and pin-plate wear tester. The results show that the Fe powder, Al powder and Cr3C2P powder in the flux cored wire are heated by argon arc, and the FeAl, Fe3Al, FeCr and Cr7C3 phases are formed after melting and cooling crystallization. Some partially melted Cr3C2p also exists in the surfacing layer. Cr3C2p / Fe-Al surfacing layer of dry friction and wear resistance and oxidation resistance at 650 ℃ were higher than 2Cr13 type D517 electrode surfacing layer.