Martensitic transformation induced by single shot peening in a metastable austenitic stainless steel 301LN: Experiments and numerical simulation

Romain Guiheux (1) , Sophie Berveiller (1) , Régis Kubler (2) , Denis Bouscaud (1) , Etienne Patoor (1) , Quentin Puydt (3)

1 LEM3 - Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux
2 MSMP - Mechanics surfaces and materials processing
3 IRT - Institut Régional du Travail [Nancy]

During conventional shot peening on metastable austenitic steels, martensitic transformation occurs in addition to plastic straining. In this work, the impact of a single spherical steel shot on a AISI 301LN steel was studied. The volume fraction of martensite, residual stresses in both phases were determined in the vicinity of the dent as a function of the shot velocity and diameter. An elasto-plastic two phase model that includes martensitic phase transformation was adapted to model mechanical and microstructural fields and implemented in Abaqus Explicit for the 2D simulation of a single shot impact. It was found, for instance, that the martensitic transformation takes place only under the dent and that martensite is in tension at the surface while austenite is in compression. Simulation results of stress levels showed a good agreement with experimental stresses determined by X-ray Diffraction.

Mots clés: Shot peening; Austenitic steel; Martensitic transformation; Residual stresses; Finite element modeling

Domaines: Mécanique des matériaux [physics.class-ph]

Romain Guiheux, Sophie Berveiller, Régis Kubler, Denis Bouscaud, Etienne Patoor, et al.. Martensitic transformation induced by single shot peening in a metastable austenitic stainless steel 301LN: Experiments and numerical simulation. Journal of Materials Processing Technology, 2017, 249, pp.339-349. ⟨10.1016/j.jmatprotec.2017.06.015⟩. ⟨hal-01827692⟩