二次淬火是在碳合金元素（Co和Al除外）较多的钢中淬火后有较多的残余奥氏体，高合金钢中，例如，高速钢淬火后残余奥氏体高达25%～30%。在一般合金钢中残余奥氏体于200～300℃回火中转变成F（铁素体）和碳化物。
... Hardening temperature 淬火温度 Double hardening 二次淬火 Flame hardening 火焰淬火 ...
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... regenerating furnace蓄热式炉 regenerating quenching二次淬火、复式淬火（渗碳钢经两次淬火，以细化晶粒） regeneration蓄热法、复活、再生、还原、再生现象、反馈、回授 ...
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Against above flaw, the article research heat treating regime of ship skull steel to Ni-Cr-Mo series, in order to improve strength and ductility, the feature is that proceeding secondary quenching in two-phase area after quenching, proceeding tempering subsequently.
针对上述不足,本文开展了Ni-Cr-Mo系船体结构用钢强韧化热处理工艺制度研究,其特点是淬火后,在(α+γ)两相区之间进行二次淬火,随后进行回火。
参考来源 - 高强度船体结构用钢强韧化热处理工艺制度研究·2,447,543篇论文数据，部分数据来源于NoteExpress
结果表明，随二次淬火温度的升高，硬度逐渐升高。
The results show that the higher the second quenching temperature, the higher the hardness.
超高碳钢控轧后进行超细球化预处理，并在不同的温度下进行二次淬火。
Ultra-fine spheroidizing pretreatment technology was applied to the 1.41%C hot-rolling ultra-high carbon steel. Then the second quenching was carried out at different temperature.
分析讨论了二次淬火后马氏体的组织与亚结构，测量了该材料的主要力学性能。
The martensite substructure after quenching and the effect of grain size on the martensite substructure had been studied. The mechanical properties were measured.
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