INFLUENCE OF THE SHOT PEENING TEMPERATURE ON THE RELAXATION BEHAVIOUR OF RESIDUAL STRESSES DURING CYCLIC BENDING

Author:  A. WICK, V. SCHULZE, O. VOHRINGER
Source:  Conf Proc: ICSP-7 (pg 102-109)
Doc ID:  1999124
Year of Publication:  1999
Abstract:  
ABSTRACT Shot peening of steels at elevated temperatures (warm peening) can improve the fatigue behaviour of workpieces. For the steel AISI 4140 (German grade 42CrMo4) in a quenched and tempered condition, it is shown that this is not only caused by the higher compressive residual stresses induced but also due to an enlarged stability of these residual stresses during cyclic bending. This can be explained by strain aging effects during shot peening, which cause different and more stable dislocation structures. KEYWORDS shot peening at elevated temperatures, relaxation behaviour, stability of residual stresses