Abstract
The creep behaviour in vacuum of type 316 stainless steel of intercept grain size 11 ± 2 μm has been investigated for stresses up to 13 MN m−2, temperatures between 873 and 1023 K (0·52–0·61 T m), and test durations of between 50 and 300 h. Creep measurements were made on electrical selfresistance heated selfloaded helical specimens as carried out previously for type 304 steel. Creep was again characterized by Bingham behaviour but with <mml:math><mml:mrow><mml:mtext>d</mml:mtext><mml:mover><mml:mi>ɛ</mml:mi><mml:mi>˙</mml:mi></mml:mover><mml:mo>/</mml:mo><mml:mtext>d</mml:mtext><mml:mi>σ</mml:mi></mml:mrow></mml:math> lower than that sustainable by Coble creep by factors of between 4 and 30, somewhat higher factors than observed previously for the corresponding study of type 304 steel. Precipitation during testing was associated with an increment in σ0 at the higher temperatures compared to prior precipitation.
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