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通过分析由高精度差分膨胀仪所记录的Fe-9Cr合金试样在连续冷却过程中的膨胀曲线,获得了试样在奥氏体(γ)→铁素体(α)转变过程中的相关动力学信息;并进一步利用等时转变动力学模型拟合了Fe-9Cr试样中铁素体转变体积分数随温度变化的试验曲线。根据动力学参数的拟合结果得出:晶核的形成主要是依靠母相中单个原子的热激活跃迁,而晶核的长大则是以原子的集体热激活跃迁为主。
Through the analysis of the expansion curve of Fe-9Cr alloy samples recorded by high-precision differential dilatometer in the continuous cooling process, the relevant power of the sample during the transformation from austenite to ferrite (α) was obtained Learn the information; and further use of isochronal kinetics model fitting Fe-9Cr sample ferrite transformation volume fraction with temperature test curve. According to the fitting results of kinetic parameters, it is concluded that the formation of nuclei depends mainly on the thermal activation transitions of single atoms in the parent phase, while the growth of nuclei is dominated by the collective thermal activation transition of atoms.