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用已加工表面的粗糙度作为切削加工性的评价指标,研究了车削加工条件下ZG120Mn13高碳高锰钢水韧态和铸态原始试样经不同温度时效处理后的切削加工性的变化规律,同时为了能够从材料组织和性能的角度解释切削加工性变化的原因也对其组织和力学性能的变化规律进行了分析。结果表明,不论原始试样是水韧态,还是铸态,经过500~650℃区间的时效处理,ZG120Mn13高碳高锰钢的切削加工性均得到明显的改善,且经550℃时效处理后,其切削加工性均达到最佳。并且,铸态原始试样除了可以直接进行车削加工之外,在相同的550℃时效处理条件下,其表面粗糙度要比水韧态原始试样的低。而切削加工性的改善与奥氏体基体上发生了珠光体的转变有关。珠光体的存在使ZG120Mn13钢的塑性大幅度降低,从而使其切削性得以改善。并且珠光体转变量越多,塑性降低越大,高锰钢的切削加工性越好。
The roughness of machined surface was taken as the evaluation index of machinability. The variation of cutting machinability of ZG120Mn13 high carbon and high manganese steel hydrate and the as-cast as-cast sample under different temperature aging conditions were studied. In order to explain the reason of the change of machinability from the point of view of material organization and performance, the changing regularity of its structure and mechanical properties was also analyzed. The results show that the cutting processability of ZG120Mn13 high carbon and high manganese steel is obviously improved no matter whether the original sample is water-toughened or as-cast. After aging treatment at 500-650 ℃, the machinability of ZG120Mn13 high- Its machinability has reached the best. In addition, the as-cast as-cast samples can be machined directly and have a lower surface roughness than those of the hydrous original samples under the same 550 ℃ aging condition. The improvement of machinability and austenite matrix occurred pearlite transformation. The presence of pearlite ZG120Mn13 greatly reduce the plasticity of steel, so that its machinability can be improved. And the greater the amount of pearlite transformation, the greater the plasticity reduction, the better machinability of high manganese steels.