美国在第二次世界大战防御战争时期,力图节省昂贵合金,以便将其用到重要的刀刃上去,遂增加使用低合金钢,但必须提高钢件的物理性能,并要硬度均匀而不变形,才能符合新的要求,这对低合金钢热处理提出了新的挑战。传统的淬火介质为水、盐水、碱液及未经处理之矿油等,很快被发现不符合新的要 During the World War II defensive war, the United States sought to save expensive alloys so that it could be used on important cutting edges and increased the use of low-alloy steels. However, the physical properties of the steels had to be improved with uniform hardness without deformation, In order to meet the new requirements, which posed a new challenge for the heat treatment of low alloy steels. The traditional quenching medium for water, salt water, lye and untreated mineral oil, etc., was soon found to be inconsistent with the new