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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Thermal Exposure on Structural Changes of M23C6 Carbide in P91 Steel
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Influence of Thermal Exposure on Structural Changes of M23C6 Carbide in P91 Steel

机译：热暴露对P91钢中M23C6碳化物结构变化的影响

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Thermal aging effect on the structural changes of M23C6 carbide precipitates was investigated after a long-term exposure of P91 steel at 600, 650, and 700 A degrees C. The identification of alloy carbides and calculation of M23C6 lattice parameters was accomplished by x-ray diffraction analysis using the Topas program based on the Le Bail pattern decomposition method. This work revealed that M23C6 carbide crystal lattice parameter progressively increases as a function of time at high-temperature exposure due to enhanced diffusion of alloying elements from matrix into the carbide lattice. Kinetic parameters of M23C6 lattice transformation were described using Johnson-Mehl-Avrami equation. The activation energy E, rate constant k, and Avrami exponent n were established, which made it possible to develop a time-temperature relationship for P91 steel structural parameter transformation. The obtained dependence of M23C6 lattice parameter transformation could be used as an indicator for the assessment of the real temperature exposure time of heat-resistant P91 steel.
机译：在600、650和700 A的温度下长期暴露P91钢后，研究了热时效对M23C6碳化物析出物的结构变化的影响。通过X射线完成了合金碳化物的鉴定和M23C6晶格参数的计算。使用基于Le Bail模式分解方法的Topas程序进行衍射分析。这项工作表明，由于合金元素从基体向碳化物晶格的扩散增强，M23C6碳化物晶格参数在高温暴露下随时间逐渐增加。使用Johnson-Mehl-Avrami方程描述了M23C6晶格转变的动力学参数。建立了活化能E，速率常数k和Avrami指数n，从而有可能建立P91钢结构参数转换的时间-温度关系。所获得的M23C6晶格参数转换的依赖性可以作为评估耐热P91钢实际暴露时间的指标。

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