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采用多元共渗软氮化及稀土催渗软氮化两种渗氮方式对5CrNiMo钢热锻模具进行处理,利用金相显微镜、X射线衍射仪,以及HDX-100数字式显微硬度计分析模具表面强化层组织、相结构以及显微硬度,研究渗氮强化处理对5CrNiMo钢热锻模具表面性能和寿命的影响。实验结果表明,经过多元共渗以及稀土催渗两种方式处理的模具,表面强化层厚度相当,约为190μm,渗氮得到的化合物主要由ε相-Fe2-3(N,C),γ’相-Fe4N和Fe3O4所组成。经过多元渗氮软氮化处理的模具渗氮层中Fe2-3N的含量明显高于经过稀土催渗软氮化处理的模具,两种处理方式得到的模具表面硬度分别提高66%和50%。两种处理方式得到的模具寿命分别延长20%和13%,单件产品成本降低8.57%和0.89%。
The microstructure of 5CrNiMo hot-forged steel was treated by nitrocarburizing with multiple co-infiltration and nitriding with rare earth. The microstructure of the 5CrNiMo steel was analyzed by metallographic microscope, X-ray diffractometer and HDX-100 digital microhardness tester Surface strengthening layer microstructure, phase structure and microhardness, to study the nitriding strengthening treatment of 5CrNiMo steel hot forging die surface properties and life. The experimental results show that the surface strengthened layer has a thickness of about 190μm after being treated by multiple co-infiltration and rare earth intrusions, and the compounds obtained by nitriding are mainly composed of ε phase -Fe2-3 (N, C), γ ’ Phase -Fe4N and Fe3O4 composition. The content of Fe2-3N in the nitrocarburized nitrocarburized by nitriding is obviously higher than that of the nitrocarburized nitrided nitrocarburized nitrocarburizing. The surface hardness of the mold obtained by the two methods is increased by 66% and 50% respectively. The life of the mold obtained by the two methods were extended by 20% and 13%, respectively, and the cost of a single product was reduced by 8.57% and 0.89% respectively.