Journal
ENGINEERING FAILURE ANALYSIS
Volume 22, Issue -, Pages 141-151Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfailanal.2012.01.016
Keywords
Splined-shaft; Carburizing; Case internal oxidation; Intergranular fracture; Stress concentration
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The splined-shafts used in truck diesel engine fractured after service of merely 7-8 h. The transverse fracture occurred at the root fillet between the tooth portion and the cylinder portion. The fracture surfaces, corresponding to the carburized layer, of the failed splined-shaft and manufactured artificially show intergranular fracture features. Intergranular facets within a depth of about 20 pm from the surface were found to be associated with the oxide compounds of Cr, Mn, Si and dimples. The fracture mechanism of the splined-shaft was ductile intergranular cracking. Microstructure observation indicates intergranular internal oxidation occurred in the carburized layer to a depth of about 20 mu m, in which oxide compounds of Cr, Mn, Si are along the grain boundaries. The association of intergranular oxidation pre-cracks with microstructural embrittlement promoted the premature failure of the splined-shaft. Over-short axial free length between the tooth portion and the cylinder portion enhances the degree of stress concentration, which contributes to the failure of the splined-shaft. (C) 2012 Elsevier Ltd. All rights reserved.
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