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为获得汽车超高强度钢BR1500HS淬火时最佳淬火工艺参数,采用中心复合实验进行实验设计,建立了奥氏体化温度、保温时间、冷却速率为设计变量以及淬火后的抗拉强度、伸长率和硬度为目标的二阶响应面回归模型。先通过方差分析与模型误差分析验证了模型的显著性与准确性,再通过CAGE优化工具箱对二阶响应模型进行优化求解,得到了一组最优的BR1500HS淬火工艺参数,即奥氏体化温度915.271℃、保温时间1.957 min、冷却速率35.057℃/s。最后经过实际试验,从获得的淬火后BR1500HS超高强度钢的抗拉强度为1570.8 MPa、伸长率为10.89%、硬度为54.2 HRC以及微观组织主要为马氏体,从而进一步验证了优化模型结果的可靠性。
In order to obtain the best quenching process parameters for the quenching of super high strength steel BR1500HS, the central composite experiment was used to design the experiment. The austenitizing temperature and holding time were established. The cooling rate was the design variable and the tensile strength after quenching. Rate and hardness as the goal of the second-order response surface regression model. First, the significance and accuracy of the model were verified by analysis of variance and model error, and then the second-order response model was optimized by CAGE optimization toolbox. A set of optimal BR1500HS quenching process parameters were obtained, namely austenitization Temperature 915.271 ℃, holding time 1.957 min, cooling rate 35.057 ℃ / s. Finally, after the actual test, from the obtained after quenching BR1500HS ultra-high strength steel tensile strength of 1570.8 MPa, elongation of 10.89%, hardness of 54.2 HRC and the main microstructure martensite, which further validated the optimization model results The reliability.