大厚度无元素稀释表面保护层的摩擦焊敷工艺

采用20钢，1Cr18Ni9Ti不锈钢在低碳钢线材表面上进行了大厚度无元素稀释表面保护层的耗材摩擦焊敷工艺试验研究。探讨了摩擦界面的摩擦行为，述了耗材金属过渡的机理，分析了焊敷层的形貌，微观组织，显微硬度和组分的分布。研究表明，应用耗材摩擦焊敷工艺可以获得大厚度，无元素稀释，显微硬度分布均匀，固相连接的表面保护层；摩擦系统的热物理不对称性是耗材金属过渡的驱动力；耗材金属通过真实接触面向母材表面过渡，其行为遵循金属摩擦的焊合－剪切－犁削理论；耗材磨擦焊敷工艺具有细化焊敷层和热影响区组织的工艺特性。

Study on Friction Surfacing with Characteristics of Non-Dilution and Thick Coating Layer

Using the consumable rods of 20 steel and 1Cr18Ni9Ti stainless steel, experimental studies of friction surfacing welding were carried out to clarify the nature of the frictional and transferring behavior of consumable metal. The macro pattern, microstructure, microhardness and components of welding deposition were examined in detail, and also the driving force of metal transferring was discussed elaborately. Results showed that a solid bonding and non dilution thick coating layer with uniform distribution of hardness could be obtained by using consumable rod friction welding deposition process. The asymmetric thermo physical property of frictional system was the driving force of metal transferring which was not from the whole rotational plane but real contact plane and transferring behavior followed the frictional rules of welding on, shearing and plowing. The welding deposition was consisted of refined microstructure and so did the HAZ.