Modelling hot cracking in 6061 aluminium alloy weld metal with microstructure based criterium

Aurélie Niel (1, 2) , Cyril Bordreuil (1, 2) , Fréderic Deschaux-Beaume (1, 2) , Gilles Fras (1, 2)

1 LMGC - Laboratoire de Mécanique et Génie Civil
2 AS - Assemblages Soudés

Hot cracking in welding is a complex phenomena due to coupling between process, metallurgy and mechanical loading. In this paper, a coupled approach that integrates microstructural prediction based on the process simulation and criteria at the microstructural scale is proposed. The criteria is based on some development of Rappaz et al [1] and takes into account the influences of grain morphology, mechanical and thermal fields induced by welding, on hot cracking. To integrate all factors influencing hot cracking, a methodology is developed that couples process simulation, simple microstructural prediction and criteria along columnar grains. The criteria based on the microstructure behavior is able to predict crack onset location in columnar grains zones.

Domaines: Matériaux

Aurélie Niel, Cyril Bordreuil, Fréderic Deschaux-Beaume, Gilles Fras. Modelling hot cracking in 6061 aluminium alloy weld metal with microstructure based criterium. Science and Technology of Welding and Joining, 2013, 18 (2), pp.154-160. ⟨10.1179/1362171812Y.0000000072⟩. ⟨hal-00805735⟩