RT Journal Article
SR Electronic
A1 Závodská, Denisa
A1 Guagliano, Mario
A1 Bokůvka, Otakar
A1 Trško, Libor
T1 Effect of Shot Peening on the Fatigue Properties of 40NiCrMo7 steel
JF Manufacturing Technology Journal
YR 2016
VO 16
IS 1
SP 295
OP 299
DO 10.21062/ujep/x.2016/a/1213-2489/MT/16/1/295
UL https://journalmt.com/artkey/mft-201601-0060.php
AB 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.