Relations between oxidation induced microstructure and mechanical durability of oxide scales

Valérie Parry (1) , Céline Pascal (1) , Muriel Braccini (1) , Elena Fedorova (2, 3) , Marc Mantel (1, 4) , Yves Wouters (1) , Djar Oquab (2) , Daniel Monceau (2) , Rafael Estevez (1) , Guillaume Parry (1)

1 SIMaP - Science et Ingénierie des Matériaux et Procédés
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
3 Polytechnic Institute of Siberian Federal University
4 UGITECH

Most industrial heat-resistant stainless steels contain silicon as a minor constituent. At high temperature, the internal formation of amorphous silica reduces oxidation rates but decreases the metal/oxide interface toughness. Tensile testing experiments performed on AISI 304L previously oxidized in synthetic air for 50 h at 900 or 1000 °C showed a relation between the silica morphology and location and the crack patterns. A micromechanical modeling using cohesive zone models to describe interfaces fracture behavior is proposed to investigate relevant parameters controlling the silica/alloy interface debonding. Calculations carried out using the finite elements method have shown that location of silica inclusions and silica/metal interface toughness are key parameters determining the cracks pattern morphology and the critical strain at failure.

Mots clés: Micromechanical modeling; Tensile testing; Silica embrittlement; AISI 304L

Domaines: Matériaux; Science des matériaux [cond-mat.mtrl-sci]; Génie des procédés; Matériaux

Valérie Parry, Céline Pascal, Muriel Braccini, Elena Fedorova, Marc Mantel, et al.. Relations between oxidation induced microstructure and mechanical durability of oxide scales. Oxidation of Metals, 2017, 88 (1-2), pp.29-40. ⟨10.1007/s11085-016-9673-5⟩. ⟨hal-01579556⟩