Question

A metal rod, which is part of a remote manipulator assembly, is sed for transferring components between loadlocks in a high temperature processing facility. The rod material was selected so that it could sustain a tensile stress, σ of 100 MPa at 650°C. Under these conditions, the steady state creep rate is 107s1. Recent modifications to the facility have now resulted in the rod, for 50% of the operating time, being subjected to a stress and temperature of 150 MPa and 700°C. Calculate the average creep rate, if it can be assumed that the metal creeps according to the equation: wheress is the steady state creep rate, A is a constant, mole1 K-1 (hint: find the value of A) 8, Q 280 kJ mole1 and R 8.31 J

Answer 1

lo lo"구= 1.399 A A 7-148 x 10-8 Nous aytr charaa s o 16 3x to s-1 2.