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在传热模型和钢的连续冷却转变曲线结合的基础上,提出了预测淬火工件温度变化和估算淬火尺寸效应的计算机仿真方法。利用该模型分析了3Cr17NiMo抗腐蚀塑料模具钢圆坯的淬冷温度场,计算了在不同淬冷介质条件下圆坯的最大许可直径。计算机仿真结果证实,3Cr17NiMo圆坯空冷和油冷淬火时心部不出现非淬硬组织的最大许可直径分别为Φ110mm和Φ400mm。此外,该模型可用于确定不同尺寸3Cr17NiMo圆坯油淬空冷的最佳转换时机。以上计算结果与现行实际热处理操作基本上一致,说明淬冷温度场仿真技术可用于指导实际工件淬冷参数的设计和选择。
Based on the combination of heat transfer model and steel continuous cooling transformation curve, a computer simulation method for predicting temperature variation of quenched workpiece and estimating quenching size effect is proposed. Using this model, the quenching temperature field of 3Cr17NiMo anti-corrosion plastic mold steel round billet was analyzed and the maximum allowable diameter of round billet under different quenching medium conditions was calculated. Computer simulation results confirmed that, 3Cr17NiMo round billet air-cooled and oil quenched heart does not appear when the maximum allowable diameter of non-hardenable tissue Φ110mm and Φ400mm. In addition, the model can be used to determine the best timing for the quench cooling of 3Cr17NiMo billet oils of different sizes. The above calculation results are basically the same with the actual heat treatment operation, which shows that the simulation technology of quenching temperature field can be used to guide the design and selection of the actual workpiece quenching parameters.