Sulfidation Characteristics of an Advanced Superalloy and Comparison with Other Superalloys Intended for Gas Turbine Use
Sulfidation Characteristics of an Advanced Superalloy and Comparison with Other Superalloys Intended for Gas Turbine Use
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DOI：
10.1007/s11661-013-1859-8
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发表时间：
2013-07
期刊：
影响因子：
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通讯作者：
I. Gurrappa;I. Yashwanth;J. Burnell-Gray
中科院分区：
文献类型：
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作者：
I. Gurrappa;I. Yashwanth;J. Burnell-Gray
即使在腐蚀产物下面的整个氧化环境中也可能发生硫化，腐蚀产物起到扩散屏障的作用，与氧物种相比，硫物种的迁移速度更快。本文介绍了一种先进的单晶镍基高温合金(ANS)的硫化特性，并与IN792和CMSX-4高温合金进行了性能比较。结果表明，所有高温合金都极易硫化，寿命显著降低。其中，ANS对硫化更敏感，寿命显著缩短。这归因于先进合金的化学成分发生了变化。将ANS的结果与其氧化数据进行了比较，并讨论了其行为上的差异。根据不同工艺的研究结果，提出了一种表征硫化条件下ANS降解的机理。最后强调了高温硫化防护涂层在提高燃气轮机效率方面潜在应用的必要性。
Sulfidation may occur even in an overall oxidizing environment beneath a corrosion product which assumes the role of a diffusion barrier allowing sulfur species transport at a faster rate when compared with that of oxygen species. The current paper presents sulfidation characteristics of an advanced single-crystal nickel-based superalloy (ANS) and compares performance with IN 792 and CMSX-4 superalloys. The results showed that all the superalloys were highly vulnerable to sulfidation and their lives were significantly reduced. Among them, the ANS was more susceptible to sulfidation and its life was reduced considerably. This is attributed to the changed chemistry of the advanced alloy. The results for ANS are compared with its oxidation data and the difference in its behavior is discussed. A degradation mechanism, which represents the deterioration of ANS under sulfidation conditions, is proposed based on the results obtained from different techniques. Finally, the necessity of protective coatings for shielding against high temperature sulfidation for potential application in enhanced efficiency of gas turbine engines is emphasized.