Damage observation in a high-manganese austenitic TWIP steel by synchrotron radiation computed tomography

Julie Lorthios (1) , Franck N'Guyen (1) , Anne-Françoise Gourgues-Lorenzon (1) , Thilo F. Morgeneyer (1) , P. Cugy (2)

1 CDM - Centre des Matériaux
2 ArcelorMittal Maizières Research SA

Internal damage below the fracture surface of a multiaxial specimen made of twinning-induced plasticity (TWIP) steel was observed by three-dimensional X-ray microtomography as very elongated “primary” voids. Specific tools for the local damage analysis were developed. A gradient in void volume fraction was measured from the fracture surface down to the bulk of the scanned volume (from not, vert, similar0.06% to <0.02%). However, the fracture surface is mainly composed of tiny secondary dimples (>90% in area fraction), indicating strongly localized final fracture.

Mots clés: TWIP steel; X-ray synchrotron radiation; Fracture; Anisotropic damage development

Domaines: Matériaux

Julie Lorthios, Franck N'Guyen, Anne-Françoise Gourgues-Lorenzon, Thilo F. Morgeneyer, P. Cugy. Damage observation in a high-manganese austenitic TWIP steel by synchrotron radiation computed tomography. Scripta Materialia, 2010, 63, pp.1220-1223. ⟨10.1016/j.scriptamat.2010.08.042⟩. ⟨hal-00541294⟩