Modelling of High Temperature Corrosion to Predict the Microstructure Evolution in Nickel-Base Alloys during Exposure to Oxygen-Nitrogen Mixed Gas Environments

高温腐蚀建模以预测镍基合金暴露于氧氮混合气体环境期间微观结构的演变

• 批准号: 446488654
• 负责人: Professor Dr.-Ing. Ulrich Krupp
• 金额: --
• 依托单位: Institut für Eisenhüttenkunde (IEHK)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/446488654?language=en
• 关键词: Modelling; Temperature; Corrosion; Predict; Microstructure

In the framework of the proposed project, a simulation software will be developed that combines distinct features of a coupled thermodynamic-kinetic model and the cellular automata approach in a synergistic way. A combination of both approaches will offer the possibility to create a valuable modelling tool that considers thermodynamics and multiple transport mechanisms within a unified software. This will enable a quantitative description of simultaneously occurring damage mechanisms and thereby, predict the extent of degradation and the chemical service life of Ni-base alloys in oxidizing and nitriding atmospheres. The new modelling tool should be able to predict the various degradation mechanisms (e.g., near surface depletion of the protective oxide-forming alloying elements, wall thickness loss, depth of corrosive attack, formation of potentially detrimental intermetallic precipitate) as a function of (i) time and temperature, as well as of (ii) alloy composition, (iii) atmosphere, and (iv) microstructure. The model will be validated by comparison with experimental results obtained from thermogravimetric and thermal-cycling exposures in to oxygen-nitrogen mixed gas environments.

在拟议项目的框架内，将开发一个模拟软件，以协同方式将化学动力学耦合模型和元胞自动机方法的独特特征结合起来。这两种方法的结合将提供创建一个有价值的建模工具的可能性，该工具在统一的软件中考虑热力学和多种传输机制。这将使同时发生的损坏机制的定量描述，从而预测的程度的退化和化学使用寿命的镍基合金在氧化和氮化气氛。新的建模工具应该能够预测各种退化机制（例如，保护性氧化物形成合金元素的近表面耗尽、壁厚损失、腐蚀侵蚀的深度、潜在有害的金属间沉淀物的形成）作为（i）时间和温度以及（ii）合金组成、（iii）气氛和（iv）微观结构的函数。该模型将通过与氧氮混合气体环境中热重和热循环暴露的实验结果进行比较来验证。