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试验过程模拟武钢CSP均热炉的加热条件,分别研究加热温度、保温时间、炉内气氛对弹簧钢50CrV4表面脱碳的影响规律。结果表明,50CrV4钢脱碳厚度随保温时间的延长而增加;保温时间为30和60min,加热温度低于1050℃时,脱碳层厚度随温度升高而增加,高于1050℃时,脱碳层由于氧化加剧而减少,1050℃为脱碳敏感温度;O_2+CO_2+H_2O+N_2混合气氛比O_2+CO_2+N_2和H_2O+N_2降低脱碳层厚度更加明显。结合氧化模型和菲克第二定律,建立并修正了脱碳计算模型,利用试验数据验证其可靠性。
During the experiment, the heating conditions of CSP induction furnace in Wuhan Iron and Steel Co., Ltd. were simulated. The influences of heating temperature, holding time and furnace atmosphere on the surface decarburization of 50CrV4 steel were studied respectively. The results show that the decarburization thickness of 50CrV4 steel increases with the holding time, the holding time is 30 and 60min, and the thickness of decarburized layer increases with increasing temperature when the heating temperature is lower than 1050 ℃. Layer decreases due to the increase of oxidation, and the decarbonization temperature is 1050 ℃. The thickness of decarburized layer is lower than that of O_2 + CO_2 + N_2 and H_2O + N_2 in O_2 + CO_2 + H_2O + N_2 mixed atmosphere. Combining the oxidation model and Fick’s second law, a decarburization calculation model was established and verified, and the reliability of the model was verified by experimental data.