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Based on thermodynamics and kinetics, a new mathematical model was developed to calculate the CCT diagrams and the transformation kinetics in low carbon niobium steels, in which the effect of deformation on the degree of supercooling was taken into account. The undercooling caused by deformation is the major reason for the increase of the starting transition temperature during continuous cooling. The critical cooling rate of bainite formation is within 2-5 ℃/s for the studied niobium steels and deformation is suitable for the occurrence of pearlite. The ferrite volume fraction increases with the increase of the austenite boundary area, and decreases with the increase of the cooling rate. The calculated CCT diagrams and the volume fraction of each phase are in good agreement with the measurements. 相似文献
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通过对1500宽带生产线层流辊道的减速电机安装方式及轴承座结构的改造,降低了故障发生率;同时改进了辊道底座结构,并应用"换模理论"进行更换辊道,提高了安装精度和更换效率,稳定了工艺性能。 相似文献
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The use of computer simulation techniques in the control system design of the laminar cooling process in a hot mill can significantly reduce the development cost while ensuring maximum production safety. The case-based modelling strategy that the authors proposed was implemented in a software package. The functional structure of the software package was discussed in detail. The interfaces and functions of the software package were introduced. The results of industrial experiments can be directly visualized in the software package, allowing accurate and instant comparison of the model predictions with real measurements. The software package provides the simulation platform for research into advanced modelling and control strategies of the laminar cooling process in a hot rolling mill. 相似文献
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热轧冷却工艺对Nb-Ti微合金双相钢组织和性能的影响 总被引:2,自引:0,他引:2
研究了热轧后空冷(800-850℃→750℃)+水冷(750℃→300~180℃)的两段式和水冷(782℃→760℃)+空冷(760℃→713℃)+水冷(713℃→414℃)三段式冷却方式对双相钢(%:0.08C、1.02Mn、0.22Si、0.02Nb、0.01Ti)组织和机械性能的影响。结果表明,采用两段式冷却方式可得到铁素体+分散的板条马氏体组织,并使铁素体尺寸达5.5μm,钢的屈服强度为345~365 MPa,抗拉强度为565~575 MPa、屈强比为0.60~0.65,优于三段式冷却方式轧制的双相钢。 相似文献