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3. Inconel 738 superalloy is subjected to creep tests at a constant stress. Steady state creep rates () of this superalloy are given as

3. Inconel 738 superalloy is subjected to creep tests at a constant stress. Steady state creep rates () of this superalloy are given as 1.4x10s and 8.2x107s for the temperatures of 600C and 800C, respectively. (a) Calculate activation energy of creep for the given temperature interval. (b) Calculate steady state creep rate at 700C. (R: 8.3144 J/mol.K)

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