Surface modifications induced by shot peening and their effect on the plane bending fatigue strength of a Cr-Mo steel produced by powder metallurgy |
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Authors: | A Molinari E SantulianaI Cristofolini A RaoS Libardi P Marconi |
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Affiliation: | a University of Trento, Trento, Italy b TFM Group, Grisignano,Padova, Italy c 2Effe Engineering, Soiano al Lago, Brescia, Italy |
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Abstract: | The effect of shot peening on the plane bending fatigue strength of a 7.1 g/cm3 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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Keywords: | Powder metallurgy Fatigue Steels |
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