两种中铬堆焊合金组织及性能的研究

Study on Microstructure and Properties of Two Medium Chromium Surfacing Alloys

对XU524-A型焊丝的成分进行优化,制备出新型的Fe-Cr-C堆焊合金焊丝,以提高轧辊堆焊层的高温耐磨性。在轧辊表层使用自动埋弧焊机进行堆焊试验,并对试样开展微观组织、硬度和耐磨性的测试与分析试验。试验结果表明:两种堆焊合金焊丝形成的堆焊层和母材熔合情况良好,无缺陷;新型焊丝堆焊层的显微硬度要高于XU524-A型焊丝堆焊层;堆焊层表面的硬度值在400℃回火温度时达到峰值。新型焊丝在堆焊合金的耐磨性比XU524-A焊丝的高。

The composition of XU524-A welding wire was optimized, and a new type Fe-Cr-C surfacing alloy welding wire was prepared to improve the high temperature wear resistance of the surfacing layer of roll. The automatic submerged arc welder was used for the surfacing test on the surface of the rolls. The microstructure, hardness and wear resistance of the samples were tested and analyzed. The experimental results show surfacing layer formed by two kinds of surfacing alloy wires and base metal bond well without defects. The microhardness of surfacing layer by the new type welding wire is higher than the microhardness of the surfacing layer by XU524-A wire. When the tempering temperature is 400℃, the surface microhardness of the surfacing layer is maximum. The wear resistamce of surfacing alloy by new welding wire is higher than that by XU524-A welding alloy.