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Assessing the fatigue strength of a sintered steel as affected by the highly stressed volume

: Zafari, A.; Beiss, Paul; Broeckmann, C.; Lipp, Klaus

European Powder Metallurgy Association -EPMA-:
Euro PM 2011 Proceedings. Vol 1: Sintered Steels (PM Low Alloyed Steels, PM Stainless Steels); PM Tool Materials (Hard Materials & Diamond Tools, PM Tool Steels); PM Functional Materials : Powder Metallurgy Congress & Exhibition; 9th - 12th October 2011, CCIB Congress Centre, Barcelona, Spain
Barcelona, 2011
ISBN: 978-1-89907-220-0
European Congress and Exhibition on Powder Metallurgy (EURO PM) <2011, Barcelona>
Powder Metallurgy World Congress & Exhibition (PM) <2011, Barcelona>
Conference Paper
Fraunhofer LBF ()
prealloyed steel; sinter hardening; sintering heat; fatigue strength; sintered steel

A 1.5% Mo prealloyed steel, to which 2% Cu and 0.65% C were added, was sintered at 1120 °C and fatigue tested under axial, plane bending and torsion loading with stress ratios of R = 1 and R = 0. Four different notched and unnotched specimen geometries were used in this study. The stress concentration factors Kt were determined by finite element analysis (FEA) as depending on load case and specimen thickness. The measured nominal fatigue strength I at 107 cycles multiplied by the stress concentration factor Kt yields the locally endurable fatigue strength. Also by FEA, the volume V90 around the highest first principle stress 1 was calculated which is enclosed by an envelope of 0. 9 I. If the locally endurable fatigue strength KtA is plotted versus the highly stressed volume V90 all data fall into a narrow scatter band which can be described by a density modified three parameter Weibull distribution.