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November 11-16, Orlando , Florida, 2009


**2** 

*India* 

**The Selection of Materials** 

**for Marine Gas Turbine Engines** 

I. Gurrappa1, I. V. S. Yashwanth2 and A. K. Gogia1

*2M.V.S.R. Engineering College, Nadargul, Hyderabad* 

*1Defence Metallurgical Research Laboratory, Kanchanbagh PO, Hydereabad* 

The desire forever-greater efficiency and increased performance has driven the development in modern gas turbine engines. These engines require high performance materials to exhibit maximum efficiency by increasing their operating temperatures. The blades in modern aero, marine and industrial gas turbines are manufactured exclusively from nickel based superalloys and the compressor section components from titanium based alloys (Fig.1). Achieving enhanced efficiency for marine gas turbines is a major challenge as the surrounding environment is highly aggressive. This aspect depends not only on the design but also on the selection of appropriate materials for their construction. Between the two, selection of materials plays a vital role as the materials have to perform well for the designed period under severe marine environmental conditions. The marine environment makes the superalloys and / or titanium based alloys to undergo a process namely hot corrosion. Hot corrosion can be divided into two types i.e. type I which takes place between

Fig. 1. Significance of superalloys and titanium alloys in gas turbine engines

**1. Introduction** 

