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首页> 外文期刊>Journal of iron and steel research >Computer Model of Phase Transformation From Hot-Deformed Austenite in Niobium Microalloyed Steels
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Computer Model of Phase Transformation From Hot-Deformed Austenite in Niobium Microalloyed Steels

机译：铌微合金钢热形变奥氏体相变的计算机模型

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摘要

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 deg C/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.
机译：基于热力学和动力学，建立了一个新的数学模型来计算低碳铌钢的CCT图和相变动力学，其中考虑了变形对过冷度的影响。变形引起的过冷是连续冷却过程中起始转变温度升高的主要原因。对于所研究的铌钢，贝氏体形成的临界冷却速率在2至5℃/ s之内，并且变形易于发生珠光体。铁素体体积分数随奥氏体边界面积的增加而增加，随冷却速率的增加而减小。计算得出的CCT图和各相的体积分数与测量值非常吻合。

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