Bainite has been recognized to have both high strength and good toughness. Therefore, the isothermal quenching treatment at 220 ºC was applied to conventional maraging steel with ultra-low carbon content. It was found that the bainitic microstructure was successfully achieved by isothermal quenching treatment for this maraging steel. After aging at 500 ºC for 3 h, the tensile strength of such bainitic aging steel reached 2.2 GPa, the room temperature Charpy V-notch impact energy 15 J, and fatigue strength 775 MPa.

中文翻译：

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超高强度贝氏体时效钢

贝氏体已被公认为具有高强度和良好的韧性。因此，对常规超低碳马氏体时效钢采用220 ℃等温淬火处理。结果发现，该马氏体时效钢通过等温淬火处理成功获得了贝氏体组织。该贝氏体时效钢经500℃时效3h后，抗拉强度达到2.2GPa，室温夏比V型缺口冲击功15J，疲劳强度775MPa。