Question

The creep properties of a superalloy are being tested in a lab. The specimen is 100mm long and is subjected to a test temperature of 1000C. After 80 hours the specimen extends by1.5mm. What is the creep rate (assuming a linear response)? Using the data given, if a new specimen is tested at a test temperature that is 200C higher, what is the expected increase in specimen length after the same test period? (activation energy for steady state creep = 21.16x10^4Jmol-1, and R = 8.31 Jmol-1K-1). Hint: you need to calculate the constant “A” first. (Ans 22.6mm.)

Answer 1

2T rate AL -산 1-5, e0.0 S oboxo mや 8.314丁/mJ.K 2-075x107 2416Y (o 一 1120 C 5105x e ol- 22.6mm