ESOMAT 2009, 06016 (2009)
DOI: 10.1051/esomat/200906016

Mechanical Behavior of a Metastable Austenitic Stainless Steel

P. Haušild¹, P. Pilvin² and M. Karlík<sup>1

1</sup>  Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Materials, Trojanova 13, 120 00 Praha 2, Czech Republic
²  Université de Bretagne-Sud, Laboratoire d’Ingénierie des Matériaux de Bretagne, Rue de Saint-Maudé, BP 92116, 56321 Lorient, France

petr.hausild@fjfi.cvut.cz

Published online: 1 September 2009

Abstract
The mechanical properties of metastable austenitic steel corresponding to the AISI301 were characterized by means of tensile testing and cupping tests. High sensitivity to the strain rate was observed. The fracture mechanism in tensile specimens changed from the combination of cleavage and ductile dimpled rupture at lower strain rates to entire ductile dimpled rupture at higher strain rates. Fracture mechanisms were very different in deep drawn cups. After deep drawing tests, delayed cracking occurred. Main fractographic feature observed in cracked deep drawn cups was the intergranular decohesion.
The mechanical behavior was described by a two-phase model incorporating the martensitic transformation. Identification of parameters was carried out on complex loading paths (tensile test, shear test, cyclic loadingunloading).

© Owned by the authors, published by EDP Sciences 2009