堆焊高合金钢碳氮合金化行为及高温耐磨性能

Carbonitride alloying behaviour and high temperature wear- resistance of high alloy steel produced by surfacing welding

对堆焊高合金钢硬面合金进行碳氮合金化,研究了Nb,V和Ti等强碳氮化物形成元素的碳氮合金化行为,并考察了碳氮合金化对硬面合金的抗高温耐磨损性能的影响.实验结果表明:碳氮合金化高合金钢硬面合金焊态下的基体组织主要为马氏体和残余奥氏体,基体上还分布着较大尺寸的碳氮化物硬质相颗粒;氮合金化具有稳定奥氏体区的作用,增加残余奥氏体含量提高了碳氮合金化高合金钢硬面合金的韧性;碳氮合金化高合金钢硬面合金在高温磨损环境下基体表面会析出细小的弥散分布的碳氮化物硬质相颗粒,提高了合金的硬度和高温耐磨损性能.

The carbonitride alloying was conducted for the high alloy steel hardfacing alloy. Carbonitride alloying behaviours of the strong carbonitride forming elements such as Nb, V and Ti which added to the alloy were studied, and high temperature wear-resistance of the alloy was also analyzed. The results show that microstructure of the hardfacing alloys in this research is primarily composed of martensite and residual austenite, with some large size carbonitride particles located on the matrix structure. Carbonitride alloying makes the residual austenite more stable, and the increase of residual austenite proportion is benefit to the toughness of hardfacing alloy. Under high temperature, the carbonitride particles will precipitate fine division and carbonitride hard particles distributed homogeneously on the matrix, which can improve the hardness and the high temperature wear-resistance of hardfacing alloy.