中高锰钢耐磨堆焊层的自强化机理

Self Strengthening Mechanism of High and Middle Manganese Steel Hardfacing layer

针对高锰钢堆焊可焊性差的问题,利用接触疲劳试验分析了Mn元素在Fe-Mn合金中的作用。阐述了中高锰钢耐磨堆焊层的自强化机理。高锰钢的自强化以加工硬化为主,而中锰钢的自强化以应变诱发马氏体相变强化为主。这种特殊的强化机制能够显著提高堆焊层的使用寿命。通过相变热力学分析,对获得中锰钢堆焊层成分的方法进行了设计。利用动载磨料磨损试验验证了中高锰钢的自强化机理。

Directing against the problem of poor weldability of high manganese steel, the effect of Mn element in the Fe-Mn alloy was analyzed through contact fatigue test. The self strengthening mechanism of high and middle manganese steel hardfacing layer was also presented. Work hardening is the main self strengthening mechanism of high manganese steel, and strain induced martensite transformation is the main self strengthening mechanism of middle manganese steel. The special strengthening mechanism determined the significant improvement of service life of hardfacing layer. By the analysis of transformation thermodynamics, the method of how to obtain the appropriate composition of middle manganese steel was designed. The self strengthening mechanism of high and middle manganese steels was verified with dynamic load abrasive wear test.