Although a lot of work has been done to understand both major mechanisms of hot corrosion, namely type I (high-temperature hot corrosion) and type II (low temperature hot corrosion), there is very little information available on more representative cyclic performance in these regimes. This work addresses this by assessing the performance of isothermal (type I and type II) hot corrosion tests against combined (short and long) cyclic corrosion tests. Single-crystal alloy PWA 1484 and directionally solidified alloy MAR-M247 were assessed in all test regimes. Pre- and post-exposure dimensional metrology was used to quantify the corrosion damage and characterised using SEM/EDX. This paper highlights that the results of short cycle test conditions are more damaging compared to long cycle and standard isothermal type I and II test conditions. The cast nickel-based alloy MAR-M247 was found to be a better performer compared to PWA 1484 single-crystal alloy.

虽然已经做了很多工作来了解热腐蚀的两种主要机制，即 I 型（高温热腐蚀）和 II 型（低温热腐蚀），但关于这些具有代表性的循环性能的信息很少。制度。这项工作通过评估等温（I 型和 II 型）热腐蚀试验与组合（短和长）循环腐蚀试验的性能来解决这个问题。单晶合金 PWA 1484 和定向凝固合金 MAR-M247 在所有测试方案中进行了评估。暴露前和暴露后的尺寸计量用于量化腐蚀损伤，并使用 SEM/EDX 进行表征。本文强调，与长周期和标准等温 I 型和 II 型测试条件相比，短周期测试条件的结果更具破坏性。