论文部分内容阅读
Sharma等人提出的关于Fe—C—Cr三元合金中珠光体长大的机理已延伸到其它系列中。部分热力学和半经验动力学模型被用来计算Fe—C—x(x=Mn、Cr、Ni、Si)合金中珠光体长大的速率,与实验数据相比较,正如模型预报的那样,一般说来,珠光体的长大在低过饱和度下受合金元素的边界扩散的控制,在高过饱和度下受碳的体积扩散的控制。这二种机理的转化温度是合金元素种类和含量的函数。
The mechanism proposed by Sharma et al. For pearlite growth in Fe-C-Cr ternary alloys has been extended to other series. Some thermodynamic and semi-empirical kinetic models were used to calculate the rate of pearlite growth in Fe-C-x (x = Mn, Cr, Ni, Si) alloys compared to experimental data, as predicted by the model In other words, the growth of pearlite is controlled by the diffusion of alloying elements at low supersaturation and controlled by the volumetric diffusion of carbon at high supersaturation. The conversion temperatures of these two mechanisms are a function of the type and amount of alloying elements.