NVE36船板钢连续冷却转变行为及动力学回归模型

Continuous cooling transformation behaviour and kinetic regression model of NVE36 steel

采用热膨胀仪对船板钢NVE36进行了连续冷却转变曲线(CCT曲线)的测定,并用显微镜观察其室温组织,用维氏硬度仪测定了组织硬度.利用Matlab软件平台对实验数据进行处理,建立了相变点温度-冷却速率关系模型及动力学回归模型,回归计算得到该钢种的最优模型系数.最后对比了NVE36钢在连续冷却过程中实验和回归模拟的动力学行为.结果表明计算值与实验值吻合很好,证明所建立模型的合理性及数据处理方法的可行性.

Continuous cooling transformation （CCT） curves of NVE36 steel were measured by thermal dilatometer. The microstructures at room temperature were observed by optical microscope and the hardness was tested with a Vickers hardness tester. Data processing was carried out at the platform of Matlab software, and the relationship model of phase transformation temperature and cool- ing rate and the kinetic regression model were established. After regressive calculations the optimal coefficients of the models for this steel were obtained. Finally, the measured and calculated kinetic behaviors during continuous cooling of NVE36 steel were compared. It is shown that the calculated result is in reasonable agreement with the experimental data, proving the rationality of the models established and the feasibility of data processing methods.