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众所周知,等温淬火的特点是变形小,在同样的硬度条件下冲击韧性比一般的淬火和回火高。但是,等温淬火只适用于小型的合金钢零件(φ5～10毫米),对于断面较大的锻模和碳素工具钢零件说来,由于心部的冷却速度慢,往往不能采用等温淬火。近年来,提出了一种新的淬火方法——复合等温淬火,即将零件加热到淬火温度,先在盐水溶液中(碳钢或低合金钢)或油和熔盐中(合金钢)冷
As we all know, isothermal quenching is characterized by small deformation, under the same hardness toughness than the general quenching and tempering high. However, the austempering is only suitable for small alloy steel parts (φ5 ~ 10 mm), for the larger die and carbon tool steel parts, due to the slow cooling of the heart, often can not be used isothermal quenching. In recent years, a new quenching method has been put forward-compound isothermal quenching, that is, the part is heated to the quenching temperature, first in salt solution (carbon steel or low alloy steel) or oil and molten salt (alloy steel)