Metallurgical and Materials Transactions B

, Volume 3, Issue 2, pp 391–400 | Cite as

Martensitic transformations induced by plastic deformation in the Fe-Ni-Cr-C system

  • F. Lecroisey
  • A. Pineau
Transformation

Abstract

Martensitic transformations induced by plastic deformation are studied comparatively in various alloys of three types: Fe-30 pct Ni, Fe-20 pct Ni-7 pct Cr, and Fe-16 pet Cr-13 pct Ni, with carbon content up to 0.3 pct. For all these alloys the tensile properties vary rapidly with temperature, but there are large differences in the value of the temperature rangeMs toMd, which strongly increases with substitution of chromium for nickel or with carbon addition. Using the node method, it is found that the intrinsic stacking fault energy in the austenite drastically increases with temperature in all the chromium-bearing alloys investigated. This variation is consistent with the observed influence of temperature on the appearance of twinning or ε martensite during plastic deformation. Very different α’ martensite morphologies can result from spontaneous and plastic deformation induced transformations, especially in Fe-20 pct Ni-7 pct Cr-type alloys where platelike and lath martensites are respectively observed. As in the case of ε martensite, the nucleation process is analyzed as a deformation mode of the material, using a dislocation model. It is then possible to account for the morphology of plastic deformation induced α’ martensite in both Fe-20 pct Ni-7 pct Cr and Fe-16 pct Cr-13 pct Ni types alloys and for the largeMs toMd range in these alloys.

Keywords

Austenite Martensite Metallurgical Transaction Martensitic Transformation Stack Fault Energy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Metallurgical of Society of AIME 1972

Authors and Affiliations

  • F. Lecroisey
    • 1
  • A. Pineau
    • 1
  1. 1.Centre des Matériaux de L’Ecole des Mines de Paris91-CorbeilFrance

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