A bar of an alloy is loaded in tension at elevated temperature, so that time-dep

Question

A bar of an alloy is loaded in tension at elevated temperature, so that time-dependent (creep) deformation occurs. Some creep data for this alloy at 200 C is given in the table: Steady state creep rate (hr-1) stress (MPa) 2.5 x 10-3 55 2.4 x 10-2 69 Calculate the steady-state creep rate (in hr-1) if the bar has a tensile stress of (4.40x10^1) MPa at (2.4x10^2) oC. Assume that the activation energy for creep is 140 kJ/mol. Express your answer in the form X.X x 10^Y. Note: Your answer is assumed to be reduced to the highest power possible.

Explanation / Answer

steadt state creep rate is 4.3 * 10^-3 hr-1.

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