9-Elevated Temp & Fracture

Material strain hardens to support the applied load

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Unformatted text preview: ogressively decrease with time. Material strain hardens to support the applied load. As further strain hardening becomes difficult strain rate decreases. Strain rate = Creep rate = dε dt STAGES OF CREEP Secondary creep Creep rate is essentially constant Steady state creep. Recovery processes involve highly mobile dislocations counteract strain hardening. Creep resistance is highest. Slope of the creep curve in this stage is referred to as minimum creep rate. Creep Behavior as a Function of Stress and Temperature CREEP RATE INCREASES AS: Stress increases Temperature increases STAGES OF CREEP Tertiary creep Creep rate rapidly increases with time up...
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This document was uploaded on 02/27/2014 for the course NANO 108 at UCSD.

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