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采用正交回归设计实验方法,分析了T8钢二次淬火温度和二次淬火保温时间对奥氏体逆相变淬火后硬度的影响,建立了硬度回归方程。结果表明,随二次淬火温度的升高,硬度逐渐升高。在820℃和850℃时,随二次淬火保温时间的延长,其硬度增加;而在880℃时,随二次淬火保温时间延长,其硬度却逐渐降低。与常规淬火硬度相比,T8钢奥氏体逆相变淬火后硬度提高6HRC,硬度最大可达68HRC。
The orthogonal regression design experiment method was used to analyze the effect of secondary quenching temperature and secondary quenching holding time on the hardness of austenite after reverse transformation quenching, and the hardness regression equation was established. The results show that with the secondary quenching temperature increases, the hardness gradually increased. At 820 ℃ and 850 ℃, with the extension of the second quenching holding time, the hardness increases; while at 880 ℃, with the second quenching holding time, the hardness decreases. Compared with conventional quenching hardness, T8 steel austenite reverse phase quenching hardness increased 6HRC, the maximum hardness up to 68HRC.