高铬合金明弧堆焊工艺参数对堆焊层显微组织及硬度的影响

Effect of Process Parameters on Microstructure and Hardness of Surfacing Layer Cladded by High Chromium Alloy Open Arc Surfacing

为满足单辊破碎机篦板的使用要求,对篦板进行堆焊处理。在不同参数下对高铬合金明弧堆焊进行了试验研究,分析了堆焊焊接过程中不同工艺参数对堆焊层的影响。结果表明,焊接速度、压道比率、焊接曲率半径对堆焊层的形貌、内部组织、力学性能存在不同程度的影响。随着焊接速度的提高,显微硬度有所提高。随着压道比率的增大,堆焊层成型更加美观。随着曲率半径的增加,堆焊层表面更平整,裂纹明显减少。热输入较小时显微组织细小均匀分布,热输入加大会出现尺寸较大的板条状碳化物,但随着热输入的进一步增加,板条状碳化物数量减小。当焊接速度为475mm/min、曲率半径为20 mm、压道比率为50%时堆焊层宏观形貌最好。

In order to meet the use requirements of the single-roll crusher plate, the surfacing of the slat plate was carried out. Under different parameters, the experiment study of high-chromium alloy open arc surfacing was carried out, and the influence of different process parameters on the surfacing layer during surfacing process was analyzed. The results show that the welding speed, overlap ratio and welding curvature radius have different effects on the morphology, internal microstructrue and mechanical properties of the surfacing layer. With the increase of surfacing speed, the microhardness increases. With the increase of the overlap ratio, the surfacing layer molding is more beautiful. With the increase of curvature radius, the surface of the welding layer is flatter, the amount of cracks reduces. When the thermal input is small, the microstructure is finely distributed, when the heat input increases, larger size slat carbide appears, but with the further increase of the heat input, the number of slat carbide decreases. When the welding speed is 475 mm/min, the curvature radius is 20 mm, the overlap amount is 50%, the macro-appearance of the welding layer is the best.