Question

A material has been creep tested and the data in the table below has been obtained 1. Using the data given, a. Estimate the steady state creep rate at temperature of 500°C and stress of 500 MPa. (5 marks) D. Estimate the time to failure for a sample Under a stress of 625 MPa at 500°C (5 marks) T (Celcius) Stress (Mpa) Stage 2 Creep Rate (1/h) Time to failure (h) 650 650 650 675 675 675 700 700 700 700 750 814 670 700 750 625 700 750 2.40E-05 4.06E-05 1.60E-04 8.00E-05 4.00E-05 2.30E-04 1.90E-04 9.00E-04 1.60E-03 225 92.7 4 56.15 73.07 20.38 16.28 15.1

Answer 1

6 50 650 650 615 645 645 100 2 4-0E -05 406E-05 16oE-04 g00 E-O5 44 00 E-og 225 92 t 814 640 too 50 625 5615 20 38 16.28 15.1 too 700 qC0E-04- 千50 60 E-03 56.64 150ィ6 o + 650 + 6天5+645+ 6チ5tRotFootto

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