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首页> 外文会议>New developments on metallurgy and applications of high strength steels >STRONG BAINITIC STEELS BY CONTINUOUS COOLING TRANSFORMATION
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STRONG BAINITIC STEELS BY CONTINUOUS COOLING TRANSFORMATION

机译：连续冷却转变产生的坚固的贝氏体钢

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摘要

Using metallurgical models, three steels were designed to obtain carbide-free bainitic structures in the as-rolled condition. Experimental castings were hot-rolled in a pilot mill and their austenite decomposition kinetics were measured using dilatometry. Tensile and Charpy impact properties were measured and the microstructures were characterised using X-ray diffractometry, optical and scanning electron microscopy. Promising results were obtained when the microstructure was composed of a _ne mixture of bainitic ferrite and retained austenite. In this case, 140 ksi (965 MPa) of yield strength was achieved in combination with good toughness. Conversely, when the structure was coarse with blocks of retained austenite between bainitic sheaves or when large martensitic regions were present, the impact properties were strongly impaired.
机译：使用冶金模型，设计了三种钢以在轧制条件下获得不含碳化物的贝氏体组织。实验铸件在中型轧机上热轧，并使用膨胀法测量其奥氏体分解动力学。测量了拉伸和夏比冲击性能，并使用X射线衍射，光学和扫描电子显微镜表征了微观结构。当显微组织由贝氏体铁素体和残余奥氏体的混合物组成时，可获得令人鼓舞的结果。在这种情况下，获得140 ksi（965 MPa）的屈服强度并具有良好的韧性。相反，当结构较粗大且在贝氏体槽轮之间留有残余奥氏体块时，或存在较大的马氏体区时，冲击性能会大大降低。

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