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通过硬度比较、微观组织观察、断裂机理分析,探索了双级氮化与传统氮化工艺对模具寿命的影响,研究了双级氮化延长模具寿命的机理。结果表明,双级氮化的硬度(HK)高于常规氮化工艺100,氮化层比普通氮化工艺厚50μm。白亮层厚度,普通氮化工艺为1.4μm,双级氮化为3.9μm。粗大的偏析相和未完全溶解的粗大碳化合物造成内应力,是导致裂纹源和模具损坏的重要因素。双级氮化模具平均寿命比普通氮化长2t,即双级氮化模具比普通氮化模具产出的铝型材多2t。
Through the comparison of hardness, microstructure observation and fracture mechanism analysis, the influence of double nitridation process and traditional nitriding process on mold life was explored. The mechanism of double nitridation to prolong mold life was studied. The results show that the hardness of two-stage nitriding (HK) is higher than that of the conventional nitriding process 100, and the thickness of the nitriding layer is 50 μm thick compared with the common nitriding process. Bright white layer thickness, the normal nitriding process is 1.4μm, two-stage nitridation 3.9μm. Internal stress caused by coarse segregation phase and incompletely dissolved coarse carbon compounds is an important factor leading to the crack source and mold damage. The average life expectancy of two-stage nitriding mold is 2t longer than that of ordinary nitriding, that is, two-stage nitriding mold is 2t more than that of ordinary nitriding mold.