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为探究SDC99冷作模具钢优化的氮碳共渗工艺,对其在不同温度、时间、气压、电压条件下的离子氮碳共渗效果开展研究。结果表明,在530℃×12 h、450~500 Pa、800~850 V、NH3/CO2为16∶1时,氮碳共渗效果较好,渗层深度为160~170μm,化合物层可达4~6μm,表面硬度为1100 HV0.3;随着稀土铈的加入,渗层深度增厚至210~220μm,化合物层可达8~10μm,其中γ’相含量由26.2%增至37.1%,表面硬度达1150 HV0.3,硬度梯度变平缓。稀土催渗样的磨损率比原始试样降低47%,耐磨性显著提高。
In order to explore the optimized nitrocarburizing technology of SDC99 cold work die steel, the effects of ion nitrocarburizing under different temperature, time, pressure and voltage conditions were studied. The results show that nitrocarburizing is better at 530 ℃ × 12 h, 450 ~ 500 Pa, 800 ~ 850 V and 16: 1 NH3 / CO2, and the depth of the infiltration layer is 160 ~ 170 μm and the compound layer can reach 4 ~ 6μm, and the surface hardness is 1100 HV0.3. With the addition of rare earth cerium, the depth of the layer increases to 210 ~ 220μm, and the compound layer can reach 8 ~ 10μm. The content of γ ’phase increases from 26.2% to 37.1% Hardness of 1150 HV0.3, hardness gradient flatten. Rare earth seepage sample wear rate lower than the original sample 47%, significantly increased wear resistance.