Abstract
The influence of the temperature θαof a prestraining of austenite above Mdon the subsequent stress-induced γ→ α’ transformation in the(M s, Md) range is examined in two carbon stainless steels. It is shown that the yield stress, which is controlled by the transformation, increases with θαat given testing temperature and amount of prestraining. This behavior is related to the influence of θαon the nature and arrangement of the defects present in austenite after the prestraining: planar defects(i.e., stacking faults, twins, e platelets) predominate if θαis close to Mdwhereas undissociated dislocation cells are only to be observed if θif higher. This is consistent with the strong increase of the intrinsic stacking fault energy of the austenite, as inferred from measurements using the node method on a hot stage microscope. In addition, the ability of plane defects to propagate under stress is shown to be lower after a prestraining at higher θα, which is attributed to a segregation of impurity atoms on dislocations. It is concluded that the nucleation stress of the γ→ α’ transformation is the stress necessary to allow planar defects to propagate in the prestrained austenite.
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This work is part of a thesis prepared at the Centre des Matériaux de l’Ecole des Mines, Corbeil, France, and submitted at the University of Nancy, June 1972.
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Abrassart, F. Stress-induced γ→ α martensitic transformation in two carbon stainless steels. Application to trip steels. Metall Trans 4, 2205–2216 (1973). https://doi.org/10.1007/BF02643289
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DOI: https://doi.org/10.1007/BF02643289