Manufacturing Technology 2016, 16(1):295-299 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/1/295

Effect of Shot Peening on the Fatigue Properties of 40NiCrMo7 steel

Denisa Závodská1, Mario Guagliano2, Otakar Bokůvka3, Libor Trško4
1 University of Žilina, Faculty of Mechanical Engineering, Univerzitná 8215/1, 010 26 Žilina, Slovakia
2 Politecnico di Milano, Department of Mechanics, Via La Masa 1, 201 58 Milano, Italy
3 University of Žilina, Faculty of Mechanical Engineering and Research Centre of University of Žilina, Univerzitná 8215/1, 010 26 Žilina, Slovakia
4 University of Žilina, Research Centre of University of Žilina, Univerzitná 8215/1, 010 26 Žilina, Slovakia

Fatigue properties of 40NiCrMo7 low alloy steel in the high cycle region were tested by rotating bending fatigue loading (f = 40 Hz, T = 20 5 , R = -1) on notched specimens after application of shot peening surface treatment (cast steel balls with diameter of 0.43 mm, Almen intensity 12A, coverage 100 % and consequently the surface was re-peened with glass beads to decrease the final roughness). The compressive residual stresses created by shot peening increased the time necessary for fatigue crack initiation what in the final case increased fatigue properties. The fatigue limit σc was higher for almost 28 % in the case of notched shot peened specimens.

Keywords: 40NiCrMo7 low alloy steel, fatigue lifetime, shot peening, residual stresses

Published: February 1, 2016  Show citation

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Závodská D, Guagliano M, Bokůvka O, Trško L. Effect of Shot Peening on the Fatigue Properties of 40NiCrMo7 steel. Manufacturing Technology. 2016;16(1):295-299. doi: 10.21062/ujep/x.2016/a/1213-2489/MT/16/1/295.
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