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离子软氮化是在Fe-C-N三元系共析温度附近进行的碳氮共渗过程,能获得较高C-N浓度的化合物层,大幅度提高钢铁零件的疲劳强度、耐磨性及抗咬合能力,而且处理时间短,变形小,适用钢种范围广。但硬度较低,硬化层深度较浅,对重负荷零件不适宜。为了充分发挥离子软氮化的优点,克服其不足,我们结合“桥式吊车减速器齿轮表面强化”的研究,将软氮化后的钢件进行再加热淬火,使化合物层及扩散层奥氏体化,急速冷却,生成高氮—碳浓度的微细马氏体,再经冷处理消除残余奥氏体,使强化效果大幅度提高,有效硬化层深度(H_v500为止)可达0.5～1.0mm,与只软氮化相比,弯曲疲劳强度再盐炉淬火后可增加30％,再高频淬火后增加52％,抗拉强度再盐炉淬火增加12％,再高频淬火增
Ionic nitrocarburizing is a carbonitriding process performed near the eutectoid temperature of the Fe-CN ternary system to obtain a compound layer with a high CN concentration, which greatly improves the fatigue strength, wear resistance and seizure resistance of steel parts , And the processing time is short, small deformation, suitable for a wide range of steel. However, the hardness is lower and the depth of the hardened layer is shallower, which is not suitable for the heavy-duty parts. In order to give full play to the advantages of ion nitrocarburizing, to overcome its deficiencies, we combined with the “bridge crane reducer gear surface strengthening” research, the nitrocarburized steel re-heating quenching, the compound layer and the diffusion layer of austenitic After quenching, the martensite with high nitrogen-carbon concentration is generated, and then the retained austenite is eliminated by cold treatment, thereby greatly enhancing the strengthening effect. The effective hardening layer depth (H_v500) can reach 0.5-1.0 mm, and Only nitrocarburized compared to the bending fatigue strength of the salt furnace after quenching can be increased by 30%, followed by high-frequency quenching increased by 52%, then the tensile strength of salt furnace quenching increased by 12%, and then quenched by high frequency