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Introduction to Aerospace Materials by A Mouritz

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12

Superalloys for gas turbine engines

12.1 Introduction

Superalloys are a group of nickel, iron–nickel and cobalt alloys used in aircraft turbine engines for their exceptional heat-resistant properties. Materials used in jet engines must perform for long periods of time in a demanding environment involving high temperature, high stress and hot corrosive gas. Many materials simply cannot survive the severe conditions in the hottest sections of engines, where the temperatures reach ~ 1300 °C. Superalloys, on the other hand, possess many properties required by a jet-engine material such as high strength, long fatigue life, fracture toughness, creep resistance and stress-rupture resistance at high temperature. In addition, superalloys resist corrosion ...

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