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Title: Influence of shot peening on the fatigue life of Cu–Ni austempered ductile iron
Authors: Zammit, Ann
Mhaede, Mansour
Grech, Maurice
Abela, Stephen
Wagner, Lothar
Keywords: Ductile iron -- Fatigue -- Testing
Ductile iron -- Fracture -- Testing
Materials -- Fatigue -- Testing
Shot peening
Issue Date: 2012
Publisher: Elsevier
Citation: Zammit, A., Mhaede, M., Grech, M., Abela, S., & Wagner, L. (2012). Influence of shot peening on the fatigue life of Cu–Ni austempered ductile iron. Materials Science and Engineering: A, 545, 78-85.
Abstract: Shot peening (SP) was carried out in order to improve the fatigue life of an austempered ductile iron alloyed with copper and nickel austenitised at 900 ◦C for 2 h and austempered at 360 ◦C for 1 h. The optimal peening intensity using S330 steel shot, was found to be 0.38 mmA producing residual compressive stresses with a maximum of approximately 1000 MPa at the surface. The microhardness at the surface was increased by SP from 370 to 535 HV. The fully reversed fatigue tests of SP-specimens showed a 61% increase in fatigue life over that of polished samples. The improvement in fatigue life is explained by the compressive residual stresses in the near surface shifting crack initiation to sub-surface. Fractography analysis showed multiple crack nucleation sites at the surface for the polished specimens, while SP-specimens showed sub-surface crack nucleation. In addition, a mixed fracture mode was also identified, with the graphite nodules and copper islands affecting crack propagation.
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