In this paper, the effects of the heating temperature and holding time on the austenite grain growth of SCM435 steel were studied and analyzed in terms of the average, macro-axis and minor-axis size of the grains. The results indicated that the classical Sellars model was highly consistent for describing the growth stage of the new austenite but poorly described the initial nucleation-growth stage and stability stage of the austenite. A new model that expresses the average austenite grain growth of SCM435 steel was developed, and the values calculated based on this model were highly consistent with the actual measured values. The standard deviation and expected grain-size expressions increased as the heating temperature and holding time increased. The macro-axis and minor-axis size of the grains were linearly correlated with the average size, and the ratio of the macro-axis to the minor-axis size remained generally constant during grain growth. Furthermore, this paper provides a new way of thinking about heredity in materials science from the perspective of mathematical characteristics.

译文

本文从晶粒的平均尺寸,宏观轴尺寸和短轴尺寸出发,研究和分析了加热温度和保温时间对SCM435钢奥氏体晶粒长大的影响。结果表明,经典的Sellars模型在描述新奥氏体的生长阶段方面高度一致,但对奥氏体的初始成核生长阶段和稳定阶段的描述却很差。建立了一种新的表达SCM435钢平均奥氏体晶粒长大的模型,基于该模型计算的值与实际测量值高度吻合。标准偏差和预期晶粒尺寸表达式随着加热温度和保温时间的增加而增加。晶粒的大轴和短轴尺寸与平均尺寸线性相关,并且在晶粒生长过程中,大轴与短轴尺寸的比率大致保持恒定。此外,本文从数学特征的角度为材料科学中的遗传问题提供了一种新的思路。

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