Abstract
Creep crack propagation behavior at high temperature was investigated for type 304 stainless steel. The present experiment reveals that creep crack propagation is explained better in terms of K than in terms of σ net . The rate of the creep crack propagation is represented by the Arrhenius equation. The activation energy is higher in the present experiment compared with the case of fatigue. Main crack extends by means of joining micro-cracks initiated at vicinity of the main crack tip. Creep rupture is occured when the value of stress intensity factor reaches its critical value which increases with decreasing temperature but independent of stress level. It is found that the creep rupture time is expressed as a function of initial stress and initial crack size, and good agreement is obtained between observed and calculated times to rupture.
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