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Title: Optimization of the Fatigue Strength of Heat Treated Steels as a Consequence of an Optimum State of the Surface and of Subsur
Author: A. Sollich, H. Wohlfahrt
Source: Conf Proc: ICSP-6, (p.251-262)
Publication year 1996
Document number: 1996039
Number of pages: 11
Abstract:
New experimental results on the improvement of the fatigue strength of differently heat treated steels due to shot peening with steel shot, with ceramic beads and also with
steel shot plus ceramic beads are compared. The results indicate that the benefical effects of shot peening depend in a rather complicated way upon the ratio of surface
hardness, surface reoughness and the magnitude of compressive residual stresses at the surface or - if subsurface crack initiation is forced - upon the distribution of
residual stresses versus depth below surface. Detailed explanations can be given considering the surface state and the distribution of residual stresses after peening.
Comparisons with the fatigue strength after CBN-grinding under a tensile prestress confirm the results and explanations.
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