分级淬火(【技】先将工件淬人温度略高于钢 Ms 点的冷却介质(如融盐)中，待工件各部分与冷却介质温度一致，并在奥氏体开始发生分解之前，迅速把工件转人另一种冷却介质中冷却至室温，使奥氏体转变为马氏体的热处理工艺。其优点是工件淬火内应力比油淬小且变形小，降低了淬裂危险性。分级淬火回火后的冲击韧性有显著提高。)
激光表面硬化(One of the latest surface treatment techniques is laser surface hardening which has the big advantage that selected areas can be hardened without treating the whole part. 激光表面硬化是最新发明的表面处理技术之一。其最大优点是不必对整个部件而只对所选定的区域进行硬化处理。)
表面硬化法(In the simplest method of case-hardening the steel articles are packed in boxes containing charcoal and other substances; they are then heated gradually to about 925°C, and maintained at that temperature for several hours. 最简单的表面硬化法是将钢件放人盛有木炭和其他材料的箱子中，然后逐渐加热到大约 925°C， 并在此温度下保持几小时。)
沉淀硬化(By adding elements such as 3 per cent copper or aluminium with about 1 per cent titanium to steels containing 17 per cent chromium and 4 to 8 per cent nickel, heat-treatment involving precipitation hardening and / or refrigeration at - 70°C can be applied, and strengths of up to 1500 newtons per sq. mm can be obtained. 通过向含有17% 的铬和4% ~8% 的镍的钢中加人3%的铜或铝以及约 1%的钛，还可以进行包括沉淀硬化在内的热处理和/或在 -70°C 下致冷，由此可获得强度高达1500 N/ mm² 的钢。)
