Surface modifications induced by shot peening and their effect on the plane bending fatigue strength of a Cr–Mo steel produced by powder metallurgy
2011
Abstract The effect of shot peening on the plane bending fatigue strength of a 7.1 g/cm 3 sintered Cr–Mo steel was investigated. Shot peening provides surface densification, strain hardening, compressive residual stresses up to −700 MPa, without impairing the dimensional and geometrical precision of specimens. Plane bending fatigue strength increases of 30%, irrespective to the different residual stress profiles obtained by changing the shot peening parameters. The improvement is mainly due to the surface densification and strain hardening.
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