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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Effects of Cooling Conditions on Microstructure, Tensile Properties, and Charpy Impact Toughness of Low-Carbon High-Strength Bainitic Steels
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Effects of Cooling Conditions on Microstructure, Tensile Properties, and Charpy Impact Toughness of Low-Carbon High-Strength Bainitic Steels

机译：冷却条件对低碳高强度贝氏体钢组织，拉伸性能和夏比冲击韧性的影响

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摘要

In this study, four low-carbon high-strength bainitic steel specimens were fabricated by varying finish cooling temperatures and cooling rates, and their tensile and Charpy impact properties were investigated. All the bainitic steel specimens consisted of acicular ferrite, granular bainite, bainitic ferrite, and martensite-austenite constituents. The specimens fabricated with higher finish cooling temperature had a lower volume fraction of martensite-austenite constituent than the specimens fabricated with lower finish cooling temperature. The fast-cooled specimens had twice the volume fraction of bainitic ferrite and consequently higher yield and tensile strengths than the slow-cooled specimens. The energy transition temperature tended to increase with increasing effective grain size or with increasing volume fraction of granular bainite. The fast-cooled specimen fabricated with high finish cooling temperature and fast cooling rate showed the lowest energy transition temperature among the four specimens bause of the lowest content of coarse granular bainite. These findings indicated that Charpy impact properties as well as strength could be improved by suppressing the formation of granular bainite, despite the presence of some hard microstructural constituents such as bainitic ferrite and martensite-austenite.
机译：在这项研究中，通过改变最终的冷却温度和冷却速率制造了四个低碳高强度贝氏体钢试样，并研究了它们的拉伸和夏比冲击性能。所有贝氏体钢试样均由针状铁素体，粒状贝氏体，贝氏体铁素体和马氏体-奥氏体组成。与用较低的最终冷却温度制造的样品相比，用较高的最终冷却温度制造的样品具有较低的马氏体-奥氏体成分的体积分数。快速冷却的试样的体积分数是贝氏体铁素体的两倍，因此其屈服强度和拉伸强度比缓慢冷却的试样高。能量转变温度倾向于随着有效晶粒尺寸的增加或颗粒贝氏体的体积分数的增加而增加。最终冷却温度高，冷却速度快的快冷试样，由于粗粒贝氏体含量最低，所以在四个试样中能量转换温度最低。这些发现表明，尽管存在一些坚硬的显微组织成分，如贝氏体铁素体和马氏体-奥氏体，但通过抑制粒状贝氏体的形成可以改善夏比冲击性能以及强度。

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