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Title: Effect Of Shot Peening On The Fatigue Strength Of Carburized Steels
Author: Naito, Ochi, Takahashi, Suzuki
Source: Conf Proc: ICSP-4, (p.519-526)
Publication year 1990
Document number: 1990028
Number of pages: 8
Abstract:
To better understand the mechanism by which compressive residual stress improves the fatigue strength of carburized gears, a crack in a rotating bending fatigue test
specimen was closely examined by scanning electron microscope. Low-carbon carburizing steels were used for fatigue test specimens, which were carburized and shot peened.
Based on the findings, the effect of shot peening on the improvement of the fatigue strength was analyzed, and methods of increasing fatigue strength by shot peening are
discussed. A fatigue crack initiates at an early stage even if the applied stress range is lower than the fatigue limit. To increase the fatigue limit, it is important to
arrest the fatigue crack at the beginning of its propagation. The improvement of fatigue properties by increasing the compressive residual stress is due to decreasing the
effective tensile stress at the crack tip. The compressive residual stress of gear surface is effectively increased by increasing the peening intensity.
Descriptors: Shot peening; Fatigue; Fatigue strength; Gear; Residual stress; Carburizing
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