Abstract
The monotonic and cyclic deformation behavior of ultrafine-grained metastable austenitic steel AISI 304L, produced by severe plastic deformation, was investigated. Under monotonic loading, the martensitic phase transformation in the ultrafine-grained state is strongly favored. Under cyclic loading, the martensitic transformation behavior is similar to the coarse-grained condition, but the cyclic stress response is three times larger for the ultrafine-grained condition.
Highlights
Stainless steels are among the most widely used materials in structural applications and are very well characterized
This hardening seems to be based on martensitic transformation as it is in good agreement with earlier studies by Hamada et al [2,20] on coarse grained (CG) 301LN
Under monotonic loading it could be shown that the hardening seems to be related to the martensitic phase transformation which strongly depends on the applied strain rate
Summary
Stainless steels are among the most widely used materials in structural applications and are very well characterized. Metastable austenitic steels gained a lot of interest as these offer the possibility to tailor the strength and ductility by introducing different ratios of soft austenite and hard martensite via heat treatments This phase transformation enhances the fatigue life significantly, as Metals 2012, 2 crack propagation is retarded due to local strengthening and crack closure effects [1,2]. SPD processing gained industrial attention and upscaling of SPD processes is currently a major field of research Both processes, reverse transformation and SPD processing, lead to similar grain sizes but significantly different microstructures in terms of defect concentrations, dislocation density, chemical and grain size homogeneity, etc.
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