By Geoffrey W. Meetham M.B.E., Prof. Dr. ir. Marcel H. Van de Voorde (auth.)

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Initially the 12%Cr steels met the requirements. 5W -0. 5Mo ~OO 500 600 Te mperature (0C) Fig. 28.

Conventionally melted turbine rotors in NiCrMoV steels are restricted to around 350°C operating temperature for this reason. The problem can be avoided by careful selection of scrap material used in the melting charge and by secondary refining processes such as ladle refining [8]. Inadequate oxidation resistance, rather than creep strength, limited the application of low alloy steels at the higher temperatures of turbine discs in early jet engine designs. Steels containing 12% Cr had been used in steam turbine rotors.

Where insulation is required to protect an underlying component from high temperature, low conductivity materials are exploited. Such materials are insulating refractories and thermal barrier coatings. 34 3 Requirements of High Temperature Materials Young)s Modulus Young's modulus (E) also influences thermal stresses. Directionally solidified nickel superalloy turbine blades have superior thermal fatigue resistance compared to the earlier conventionally cast blades. A major factor in this improvement is that the natural crystal growth direction has a significantly lower E than other crystal directions.

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