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目前对淬火介质冷却性能检测主要以冷却曲线法为主,该方法使用的探头材质为Ni-Cr合金。由于Ni-Cr合金在冷却过程中不发生相变以及导热系数与常用钢材料存在差异,不能完全反映真实工件内部冷却过程。因此选用D6AC、45、40Cr等材料来研究热处理常用淬火介质的冷却特性。研究结果表明:常用钢探头在淬火介质中获得的冷却曲线与标准探头测定的冷却曲线最大冷温及冷速存在着一定的差别,选用合适的淬火介质不应只追求最大冷速,最大冷温同样很重要。
At present, the main quenching medium cooling performance testing mainly cooling curve method, the method used in the probe material is Ni-Cr alloy. Due to the fact that Ni-Cr alloy does not change its phase during the cooling process and the thermal conductivity is different from the common steel material, the internal cooling process of the real workpiece can not be fully reflected. Therefore, the choice of D6AC, 45,40 Cr and other materials to study the quenching medium commonly used in heat treatment cooling characteristics. The results show that there is a certain difference between the maximum cooling temperature and the cooling speed of the cooling curve measured by the conventional probe and the cooling curve obtained by the common steel probe in the quenching medium. The suitable quenching medium should not only pursue the maximum cooling speed, but also the maximum cooling temperature important.