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(a) Estimate the activation energy for creep (i.e., Qc in

(a) Estimate the activation energy for creep (i.e., Qc in Equation 8.20) for the S-590 alloy having...

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(a) Estimate the activation energy for creep (i.e., Qc in Equation 8.20) for the S-590 alloy having the steady-state creep behavior shown in figure. Use data taken at a stress level of 300MPa (43,500psi) and temperatures of 650°C and 730°C. Assume that the stress exponent n is independent of temperature.

(b) Estimate ?^Y_S at 600°C (873 K) and300MPa.

Transcribed Image Text:

Q. é, = Kzu"exp(-) RT %3D (8.20) 200 30 20 100 80 10 60 427°C (800°F) 40 30 538°C (1000 F) 20 10 649°C (1200 F) 10-7 10 10-5 Steady-state creep rate (h) Stress (MPa) 3. Stress (10° psi)

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Fundamentals of Materials Science and Engineering An Integrated Approach

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Question Posted: Jul 02, 2011 10:42 AM

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