RT Journal Article
SR Electronic
A1 Mikova, Katarina
A1 Guagliano, Mario
A1 Bokuvka, Otakar
A1 Trsko, Libor
A1 Novy, Frantisek
T1 The Role of Shot Peening in Increasing X70 Steel Fatigue Properties
JF Communications - Scientific Letters of the University of Zilina
YR 2012
VO 14
IS 4
SP 94
OP 98
DO 10.26552/com.C.2012.4.94-98
UL https://komunikacie.uniza.sk/artkey/csl-201204-0016.php
AB The paper presents the authors' results of experimental examination of pipeline steel X70 fatigue properties before and after shot peening application, including relaxation of residual stresses during rotating bendi ng fatigue loading (f  30 Hz, T  20  5 °C, R  1). The obtained results confirmed the positive effect of surface hardening realized by shot peening. The fatigue properties incl. fatigue limit were higher after shot peening and this effect was visibly higher for notched specimens than for smooth specimens. During rotating bending fatigue loading the residual stresses in subsurface layers relaxes which decreases the strengthening effect after a certain number of cycles.