Influence of microstructure and manganese sulfides on corrosion resistance of selective laser melted 17-4 PH stainless steel in acidic chloride medium

Michella Alnajjar (1, 2, 3, 4) , Frédéric Christien (1, 2, 3, 4) , Vincent Barnier (4, 1, 2, 3) , Cédric Bosch (3, 1, 2, 4) , Krzysztof Wolski (4, 1, 2, 3) , A. Dominic Fortes (5) , Mark Telling (6)

1 Mines Saint-Étienne MSE - École des Mines de Saint-Étienne
2 SMS-ENSMSE - Centre Science des Matériaux et des Structures
3 LGF-ENSMSE - Laboratoire Georges Friedel
4 MPI-ENSMSE - Département Mécanique physique et interfaces
5 ISIS - ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​ISIS Neutron and Muon Source
6 Department of Materials, University of Oxford;

The corrosion resistance of 17-4PH stainless steel obtained by Selective Laser Melting was investigated. It was found that the as-built SLM-ed steel was entirely ferritic, not martensitic as expected. Re-austenitized SLM-ed steel recovered the martensitic microstructure. The two SLM-ed steels (as-built and re-austenitized) had the same general corrosion resistance which was correlated with their similar chemical composition. The martensitic re-austenitized SLM-ed steel had superior general corrosion behavior than the wrought martensitic steel. This was due to the nearly absence of MnS inclusions in the re-austenitized SLM-ed steel, while their presence in the wrought steel destabilized the passive film.

Mots clés: 17-4 PH stainless steel Selective laser melting Microstructure Corrosion properties MnS inclusions

Domaines: Matériaux

Michella Alnajjar, Frédéric Christien, Vincent Barnier, Cédric Bosch, Krzysztof Wolski, et al.. Influence of microstructure and manganese sulfides on corrosion resistance of selective laser melted 17-4 PH stainless steel in acidic chloride medium. Corrosion Science, 2020, 168, pp.108585. ⟨10.1016/j.corsci.2020.108585⟩. ⟨hal-02624498⟩