二次硬化是指含有Cr，Mo，V，Ti，Nb等碳化物的合金钢，经淬火并在500-600℃之间回火时，不仅硬度不降低，反而升高到接近淬火钢的高硬度值的现象。
... work-hardening effect 加工硬化效应 second hardening effect 二次硬化 strain hardening effect 应变硬化效应 ...
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It is not yet very known especially of the mechanical behaviour after secondary hardening such as torsion - tension - tension and tension - torsion - tension.
特别是在扭转-拉伸-拉伸和拉伸-扭转-拉伸等二次硬化后的A3钢的力学性能还不甚了解。
参考来源 - 预应变A3钢的力学性能实验研究·2,447,543篇论文数据，部分数据来源于NoteExpress
出现再热脆性的主要原因是晶界粗大碳化物的析出和晶内二次硬化。
The authors suggest that the primary factors of the reheat embrittlement are precipitation of coarse carbide along the grain boundary and secondary hardening in the grain.
以上诸因素的共同作用，使贝氏体具有比直接淬火所获得的马氏体更高的二次硬化效应、热强性和组织稳定性。
As a result of the coaction of abovementioned factors, the bainite has superior secondary hardening effect, thermal strength and structural stability to martensite formed by straight tempering.
研究表明，通过亚临界热处理可以使含有大量残留奥氏体的高铬铸铁产生二次硬化，从而提高高铬铸铁的硬度和耐磨性。
The hardening behavior and abrasion resistance of high chromium cast iron (HCCI) containing molybdenum and vanadium subjected to sub-critical treatment were studied.
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