Creep Crack Propagation in Austenitic Steels Having Different Levels of Ductility

概要

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Crack propagations under creep condition at 700℃ were investigated about two austenitic steels with different levels of ductility. Creep crack was found to grow as a result of creep deformation at the crack tip regardless of ductilities of materials used. It was also found that V/2l, where V^^・ is notch opening displacement and 2l is crack length, has a nearly constant value during crack propagation with certain materials under a certain testing condition, and that creep crack growth rate can be expressed by the following equation: d(2l)/dt=V^^・/θ, where V is notch opening displacement rate and θ=V/2l. All data obtained, namely, d(2l)/dt, V^^・, θ, showed the validity of the above expression. It is demonstrated that this expression will be introduced by applying COD criterion to creep crack propagation.
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