Behaviour of short and long cracks in air and in liquid metal in T91 steel Jean-Bernard Vogt, Carla Carle, Jérémie Bouquerel and Ingrid Proriol Serre MATEC Web Conf., 165 (2018) 03016 Published online: 25 May 2018 DOI: 10.1051/matecconf/201816503016