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Change of precipitate free zone during long-term creep in 2.25Cr-1Mo steel

机译：2.25Cr-1Mo钢长期蠕变过程中无沉淀区的变化

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摘要

This work presents a residual life assessment method based on the quantitative analysis of changes in the fraction and width of a precipitate free zone (PFZ) around grain boundaries during long-term creep. Such changes resulted from precipitation and coarsening of carbides on grain boundaries and within the ferrite matrix during long-term creep exposure. Testing was conducted at creep temperatures ranging from 450 to 650 ℃, for a maximum time of 142415.1 h. A relationship between the fraction of grain boundary with PFZ, PFZ width, and the Larson-Miller Parameter (LMP) was established, and the mechanism of PFZ formation was discussed. The increase in width, governed by the diffusion of alloy elements to grain boundaries, was mathematically modeled. The relationship between the width and creep exposure time was fitted to a square root law, and the PFZ broadening rate constant and activation energy for width growth were calculated. The proposed model will be applicable to determine the operating parameters of 2.25Cr-1Mo steel components in high-temperature equipment.
机译：这项工作提出了一种剩余寿命评估方法，该方法基于对长期蠕变过程中晶粒边界周围无沉淀区（PFZ）的分数和宽度的变化进行定量分析的方法。这种变化是由于长期蠕变暴露期间，晶界和铁素体基体内碳化物的沉淀和粗化所致。测试在450至650℃的蠕变温度下进行，最长时间为142415.1 h。建立了晶界分数与PFZ，PFZ宽度和Larson-Miller参数（LMP）之间的关系，并探讨了PFZ的形成机理。数学上模拟了合金元素扩散到晶界所引起的宽度增加。宽度与蠕变暴露时间之间的关系符合平方根定律，并计算了PFZ展宽速率常数和宽度增长的活化能。该模型可用于确定高温设备中2.25Cr-1Mo钢构件的运行参数。

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