Fatigue propagation of long cracks in metastable austenitic stainless steels
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Abstract
Fatigue crack growth of a metastable austenitic stainless steel was investigated in thin
specimen under positive stress ratio. Annealed
and
Co
l
d
rolled
conditions were used to test
the influence of the microstructure. The influence of load ratio
and load history on
propagation behavior was analyzed using the Elber`s closure approach, the Donald and
Paris partial crack closure and the empirical Kujawski (∆K•Kmax)
α
parameter.
Results show
that load ratio effects
could be explained by two parameters
concepts
. It see
ms that the
amount of martensite transformation is responsible for the observed differences in fatigue
crack growth resistance