The Selection of Materials for Marine Gas Turbine Engines

Gurrappa, I.; Yashwanth, I. V. S.; Gogia, A.K.

doi:10.5772/38436

Cited by 7 publications

(11 citation statements)

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“…In fact, it is an important issue that needs special attention by all researchers in the field. [6,32,[38][39][40][41][42][43][44]. Advancements in superalloys as well as processing techniques have permitted the hot gas path components now to operate in modern gas turbine firing at increased temperatures for significantly increased duration (many thousands of hours) under severe conditions of centrifugal, thermal and vibratory stresses.…”

Section: Electrochemical Methodsmentioning

confidence: 99%

“…Sulphur diffusion and formation of metal sulphides preferentially chromium and nickel sulphides was reported to be the influential factor [6]. When sulphide phases are formed in superalloys, Ni-based alloys are inferior to cobalt and iron based alloys, which are especially effective in destroying the corrosion resistance of alloys [26,[36][37][38][39][40][41][42]. In fact, the alloying elements play a significant role and decide the life of superalloys under hot corrosion conditions.…”

Section: Electrochemical Methodsmentioning

confidence: 99%

“…A similar reaction mechanism occurs if the superalloys contain other refractory elements like vanadium and molybdenum [26,40].…”

Section: Dms-4mentioning

confidence: 98%

“…Type I Table 5. Typical superalloys characterised for their hot corrosion resistance [6,32,[38][39][40][41][42][43][44] Some Ni-based superalloys were designed with the aid of d-electrons concept for industrial turbines. They developed based on the molecular orbital calculations of the electronic struc-Gas Turbines -Materials, Modeling and Performance tures of Ni-alloys i.e.…”

Section: Dms-4mentioning

confidence: 99%

“…It is important to mention that the coating-substrate interaction complicates the task of determining the various factors that are involved. The effectiveness of a protective coating for a particular material under service conditions can therefore be assessed only by techniques in which all the parameters like substrate, coating and environment as shown in Fig.20 are taken into account [40]. Swindells [107] and Cooper and Strang [108] have shown that one of the major problems faced by all coating systems is their mechanical properties.…”

Section: Mechanical Properties Of Coated Superalloysmentioning

confidence: 99%

See 4 more Smart Citations

The Importance of Hot Corrosion and Its Effective Prevention for Enhanced Efficiency of Gas Turbines

Gurrappa¹,

Yashwanth²,

Mounika³

et al. 2015

Gas Turbines - Materials, Modeling and Performance

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Gas Turbines -Materials, Modeling and Performance 56 the hot corrosion resistance. This is further complicated for marine applications by the aggressivity of the environment, which includes sulphur and sodium from the fuel and various halides contained in seawater. These features are known to drastically reduce the superalloy component life and reliability by consuming the material at an unpredictably rapid rate, thereby reducing the load-carrying capacity and potentially leading to catastrophic failure of components [3][4][5]. Thus, the hot corrosion resistance of superalloys is as important as its high temperature strength in gas turbine engine applications. Recent studies have shown that the high temperature strength materials are most susceptible to hot corrosion and the surface engineering plays a key role in effectively combating the hot corrosion problem [6][7]. Therefore, the two materials (base and coating) must be considered as an integral system and the interface between them is also equally important as it can often be the limiting factor. This chapter explains the critical issue of hot corrosion of superalloy components in gas turbine engines and methodologies to select appropriate materials and coatings for its prevention. It is followed by an assessment of current status of coatings, coating techniques and finally, some of the critical areas that need to be addressed for development of more efficient and smart coatings.

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Section: Electrochemical Methodsmentioning

confidence: 99%