オーステナイト系ステンレス鋼の深絞り加工材の残留応力

抄録

Deep drawing is one of the most important plastic working processes and it is being used to manufacture many products. However, the deep drawing has very complex and severe modes of deformation, such as ironing, bending and unbending. In the case of austenite stainless steel, on which deep drawing is used most extensively, there is a well known property of stress induced transformation that makes the stress state more complex.
The residual stress analysis is needed from the view point of preventing cracks caused by residual stress. So, the measurement of residual stress in austenite matrix phase and in transformed alpha' phase has been carried out by using X-ray method. After the X-ray examination, the deep drawened cup was cracked by cathodic charge of hydrogen without any mechanical disturbance to obtain the relation between residual stress and cracking.