Abstract

Using electron microscopy methods, the mechanism and kinetics of the evolution of the microstructure and phase composition of the surface diffusion zone of a cast heat–resistant alloy of the Fe–25Cr–35Ni system have been studied under conditions of long–term high–temperature exposure to an oxidizing atmosphere. The chemical compositions of the phases continuously change during alloy oxidation in accordance with complex laws depending on the environment, temperature, and exposure duration; moreover, each phase is involved in a unique oxidation process. A rigorous exchange of chemical elements takes place between the various phases. After prolonged exposure of the alloy to high temperatures, the process of phase oxidation likely reaches a stable limiting state. The obtained results are compared with those known from the review of publications on the topic.

中文翻译：

---

Fe–25Cr–35Ni体系的耐热合金中相的氧化机理

摘要

使用电子显微镜方法，研究了在长期高温条件下，Fe-25Cr-35Ni铸造耐热合金的表面扩散区的微观结构和相组成演变的机理和动力学。暴露于氧化性气氛中。在合金氧化过程中，根据环境，温度和暴露时间的长短，相的化学成分会不断变化。此外，每个相都涉及独特的氧化过程。在各个阶段之间进行了严格的化学元素交换。在合金长时间暴露于高温后，相氧化过程可能会达到稳定的极限状态。