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    厉勇, 王春旭, 刘宪民, 田志凌, 许广鹏, 赵肃武. SAE9310钢奥氏体的冷却转变行为[J]. 机械工程材料, 2010, 34(5): 12-15.
    引用本文: 厉勇, 王春旭, 刘宪民, 田志凌, 许广鹏, 赵肃武. SAE9310钢奥氏体的冷却转变行为[J]. 机械工程材料, 2010, 34(5): 12-15.
    shu
    LI Yong, WANG Chun-xu, LIU Xian-min, TIAN Zhi-ling, XU Guang-peng, ZHAO Su-wu. Microstructure Transformation Behaviour of Austenite Cooling for SAE9310 Steel[J]. Materials and Mechanical Engineering, 2010, 34(5): 12-15.
    Citation: LI Yong, WANG Chun-xu, LIU Xian-min, TIAN Zhi-ling, XU Guang-peng, ZHAO Su-wu. Microstructure Transformation Behaviour of Austenite Cooling for SAE9310 Steel[J]. Materials and Mechanical Engineering, 2010, 34(5): 12-15.
    shu

    SAE9310钢奥氏体的冷却转变行为

    Microstructure Transformation Behaviour of Austenite Cooling for SAE9310 Steel

      摘要
    • 摘要: 采用热力学计算软件和X射线衍射分析方法对高纯净SAE9310钢奥氏体化后平衡组织的转变规律进行了研究;采用膨胀法和金相法在Formastor-F II型膨胀仪上测定了该钢的连续冷却转变曲线(CCT曲线).结果表明:SAE9310钢的平衡转变组织为α-Fe、γ-Fe以及M23C6和M7C3碳化物;在连续冷却转变过程中,当冷却速率小于0.056 ℃·s-1时,转变产物为粒状贝氏体和铁素体组织;当冷却速率介于0.056～1.9 ℃·s-1时,转变产物为粒状贝氏体和少量马氏体组织;当冷却速率大于1.9 ℃·s-1后,粒状贝氏体逐渐消失,转变产物主要为板条马氏体和少量残余奥氏体组织;钢的硬度随着冷却速率的增加而逐渐提高.

       

      Abstract: With thermodynamic calculation software and XRD,the equilibrium transformation for SAE9310 steel after austenizing was investigated.Through expansion and metallographic methods the continuous cooling transformation curves of the steel were determined using Formastor-F II dilatometer.The results show that the equilibrium microstructure of SAE9310 steel was composed of α-Fe,γ-Fe,M23C6 and M7C3 carbides.The products of austenite transformation were granular bainite and ferrite when the cooling rate was lower than 0.056 ℃·s-1.Granular bainite could be mainly formed with small amount of martensite as the cooling rates were from 0.056 ℃·s-1 to 1.9 ℃·s-1.The products of austenite transformation were lath martensite with small quantity retained austenite when the cooling rate was higher than 1.9 ℃·s-1 and the granular bainite disappeared gradually.The hardness of the steel increased with the increase of cooling rate.

       

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