Influence of pre-strain and carbon content on delayed cracking phenomenon in unstable austenitic steelsS. Berveiller, M. Kemdehoundja, E. Patoor, D. Bouscaud and M.R. Berrahmoune
LPMM, Arts et Métiers ParisTech, 57078 Metz Cedex 03, France
Published online: 1 September 2009
In this paper, we study the delayed cracking phenomenon that occurs after deep drawing, at various microstructure scales. Parameters such as temperature, drawing ratio, pre-strain and chemical composition are studied. From a macroscopic point of view, the number of cracks increases with decreasing temperature or increasing drawing ratios. The higher the carbon content, the more sensitive to failure the steel is. A pre-strain favors delayaed cracking too. Martensite stress state was determined by XRD. For a given set of parameters, it is heterogeneous in a cup. Moreover it varies with drawing conditions.
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