ABSTRACT This paper studies high-temperature creep deformation of Mg retort tubes considering the decarburisation of steel. A material model was developed for finite element modelling that relates the activation energy of steel in the steady-state creep rate equation (Q) to its carbon content. Carbon content was described as a function of radial position along the retort thickness (r) and service time (t). The time-dependent activation energy, Q(C(r,t)), was incorporated in the steady-state creep equation. The FEM results of the decarburising model were compared to those of the non-decarburising model and an actually failed retort for verification. The newly developed model presents more accurate results compared to the constant material model (non-decarburising). The FE model was used to predict the effects of various process parameters (temperature, internal pressure, and furnace carbon activity) and geometric parameters (retort diameter and thickness) on the creep deformation of retorts.

中文翻译：

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脱碳对蠕变变形的影响：在镁还原钢杀菌锅中的应用

摘要 本文研究了考虑钢脱碳的镁蒸馏管的高温蠕变变形。为有限元建模开发了一种材料模型，该模型将稳态蠕变速率方程 (Q) 中钢的活化能与其碳含量相关联。碳含量被描述为沿蒸馏器厚度 (r) 和使用时间 (t) 的径向位置的函数。与时间相关的活化能 Q(C(r,t)) 被纳入稳态蠕变方程。将脱碳模型的有限元结果与非脱碳模型和实际失败的蒸馏罐进行比较以进行验证。与恒定材料模型（非脱碳）相比，新开发的模型提供了更准确的结果。