HIGH-TEMPERATURE CREEP AND CYCLIC DEFORMATION-BEHAVIOR OF AISI-316 L(N) AUSTENITIC STEEL AND ITS MODELING WITH UNIFIED CONSTITUTIVE-EQUATIONS

Creep tests at constant stress and low cycle fatigue (LCF) tests were performed with a view to investigating and modelling the deformation b ehaviour of AISI 316 L(N) austenitic stainless steel at 700 degrees C. All experiments were done on samples taken from two different sheets of the same batch of material. The creep stresses were selected from t he high stress range. The results obtained from creep tests on samples from different sheets are compared with each other. The differences b etween them and the results of a creep test carried out at constant lo ad are indicated. The LCF experiments were strain controlled. The effe cts of strain rate and strain amplitude on the cyclic hardening behavi our were investigated. The parameters of a set of constitutive equatio ns are determined from these data. The quality of the parameter fit is discussed.