铬硼钨钒系铁基PTA堆焊合金的抗高温磨损机理研究

Study on Wear Mechanism of Cr-B-W-V Fe-Base PTA Surface Alloy at High Temperature

通过观察铬硼钨钒系铁基堆焊合金在室温和高温时的金相组织、碳化物形态、组成及分布情况，证明了堆焊层中加入铬、硼、钒、钨等元素能够形成（Ｃｒ．Ｆｅ）_７Ｃ_３、ＶＣ、ＷＣ等硬质相，提高了堆焊层的常温及高温抗磨能力。但堆焊层中的碳化物（Ｃｒ、Ｆｅ）_７Ｃ_３会随着温度的升高，有部分溶解，同时基体中析出Ｃｒ_(２３)Ｃ_６，和其它碳化物共同提高堆焊层的高温耐磨性。这正是该合金高温抗磨性比较高的主要原因。

By means of observing the metallographic microstructure, morphology, composition and distribution state of Cr-B-W-V Fe-base surface alloy at atmospheric and high temperature, it is proved that addition of alloying elements Cr, B, V and W in surface layers can form hard phases (Cr.Fe)_7C_3 in surface layer can be partly solved with the rise of temperature. Meanwhile,Cr_(23)C_6 can be also separated from the matrix,which may raise the wear-resistance of surface layer at high temperature together with other carbides. All above is just the main reason why the alloy shows comparatively high wear-resistance at high temperature.