中文摘要：

利用热模拟仪对SCM435钢进行了连续冷却转变曲线（CCT曲线）的测定,并用显微镜观察及统计其室温组织.利用Or-igin软件对实验数据进行处理,根据SCM435不同冷速下的相变及相变转变量,进行铁素体、珠光体、贝氏体、马氏体相变模型的回归.并精确地建立了相变点温度-冷却速率关系模型及相变量-冷却速率关系模型,回归计算得到该钢种的最优模型系数.最后对比了SCM435钢的实验值和回归曲线,结果表明计算值与实验值吻合较好,证明所建立模型的合理性及数据处理方法的可行性,因此可以根据回归结果对实际生产中的真实冷却速率做出实时反应,便于对生产进行更加准确地控制.

英文摘要：

The continuous cooling transformation（CCT） curves of SCM435 steel were measured by a thermal-physical simulator.The micro-structures at room temperature were observed by optical microscope.Data processing was carried out by utilizing Origin software.The phase model of ferrite,pearlite,bainite,and martensite were regressed on the basis of quantity of phase transformation and phase transformation under different cooling speed of SCM435 steel.The relationship models of phase transformation temperature-cooling rate and quantity of phase transformation-cooling rate were accurately established.The optimal coefficients of this steel were obtained through regressive calculations.Finally,the measured experimental data and calculated regression curves of SCM435 steel were compared.It was shown that the calculated result was consistent with experimental data,proving the rationality of the models established and the feasibility of data processing methods.So real-time response could make for real cooling rate in actual production according to the regression results,and more accurately control could be used in production.