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-FⅡ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M_(23)C_6和M_7C_3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。
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-FⅡdilatometer.The results show that the equilibrium microstructure of SAE9310 steel was composed ofα-Fe,γ-Fe,M_（23）C_6 and M_7C_3 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.
出处
《机械工程材料》
CAS
CSCD
北大核心
2010年第5期12-15,共4页
Materials For Mechanical Engineering
