DBPapers
DOI: 10.5593/SGEM2014/B61/S24.006

CONSIDERATIONS ON SURFACE FATIGUE BEHAVIOR OF PM STEEL

C. Ionici
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-20-9 / ISSN 1314-2704, June 19-25, 2014, Book 6, Vol. 1, 39-44 pp

ABSTRACT
Latest research in the field of powder metallurgy show concern over attempts fatigue. Have been made to predict the the endurance limit to fatigue for predicting the effect of residual porosiy an the tensil strenght. It was found that the surface finish of the samples has a great influence on the fatigue strength. The sample containing pores - those caused by transient liquid phase by the Mo particle - the adverse effect of such flaws on the fatigue strength, which was also found by testing the fatigue PushPull was prepared perceptible only to the surface as is customary metallographic sections, that is, while if the influence of surface defects of the conventional polishing was masked by the closure of the pores. It highlighted the negative effect of secondary pores generated by Mo transition. They are the results of fatigue test of a high-strength sintered steel based material containing iron (0.6-0.8)% C, (1,5-2% )Mo, and 0,6% Cu. Fatigue response of the samples depends on the shape and nature of the pore is tension concentrators.

Keywords: pores, fatigue strength, powder metallurgy, sintered steels, microhardness.