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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.

Influence of pre-strain and carbon content on delayed cracking phenomenon in unstable austenitic steels