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首页> 外文期刊>Journal of Iron and Steel Research International >Effect of Niobium on Isothermal Transformation of Austenite to Ferrite in HSLA Low-Carbon Steel
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Effect of Niobium on Isothermal Transformation of Austenite to Ferrite in HSLA Low-Carbon Steel

机译：铌对HSLA低碳钢中奥氏体向铁素体等温转变的影响

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摘要

Using thermomechanical simulation experiment, the kinetics of the isothermal transformation of austenite to ferrite in two HSLA low-carbon steels containing different amounts of niobium was investigated under the conditions of both deformation and undeformation. The results of optical microstructure observation and quantitative metallography analysis showed that the kinetics of the isothermal transformation of austenite to ferrite in lower niobium steel with and without deformation suggests a stage mechanism, wherein there exists a linear relationship between the logarithms of holding time and ferrite volume fraction according to Avrami equation, whereas the isothermal transformation of austenite to ferrite in high niobium steel proceeds via a two stage mechanism according to micrographs, wherein, the nucleation rate of ferrite in the initial stage of transformation is low, and in the second stage, the rate of transformation is high and the transformation of residual austenite to ferrite is rapidly complete. Using carbon extraction replica TEM, niobium carbide precipitation for different holding time was investigated and the results suggested that NbC precipitation and the presence of solute niobium would influence the transformation of austenite to ferrite. The mechanism of the effect of niobium on the isothermal transformation was discussed.
机译：利用热力学模拟实验，研究了两种在变形和不变形条件下含铌量不同的HSLA低碳钢中奥氏体向铁素体的等温转变动力学。光学显微组织观察和定量金相分析结果表明，低铌钢中奥氏体向铁素体等温转变的动力学有无形变提示了一个阶段性机理，其中保持时间的对数与铁素体体积之间存在线性关系。根据Avrami方程的​​分数，而高铌钢中奥氏体向铁素体的等温转变根据显微照片通过两阶段机理进行，其中，转变初期铁素体的成核速率低，而在第二阶段，相变速率高，残余奥氏体向铁素体的转变迅速完成。使用碳萃取复制TEM，研究了不同保持时间下碳化铌的析出，结果表明NbC析出和溶质铌的存在会影响奥氏体向铁素体的转变。讨论了铌对等温转变的影响机理。

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