Optical and electron microscopy and x-ray spectral microanalysis are used to study the transformation of the phases present in the structure of cast refractory alloy HP40NbTi during prolonged high-temperature oxidation. It is established that during oxidation alloy phase chemical composition changes continuously and by complex laws in relation to the surroundings, temperature, and exposure duration, and there is rapid exchange of chemical elements between different phases. After prolonged exposure this process reaches a limiting condition.

中文翻译：

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铸造耐火合金 HP40NbTi 高温氧化的结构特征。第 2 部分。微观结构和相组成演变

使用光学和电子显微镜以及 X 射线光谱显微分析来研究在长时间高温氧化过程中铸造耐火合金 HP40NbTi 结构中存在的相转变。确定在氧化合金相期间，化学成分随着环境、温度和暴露时间的复杂规律不断变化，并且不同相之间化学元素快速交换。长时间暴露后，这个过程达到了一个限制条件。