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42CrMo (chromium-molybdenum alloy steel)
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42CrMo (chromium-molybdenum alloy steel)
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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001846
EISBN: 978-1-62708-241-9
... chromium steel circumferential wear marks peel pits heat tinting fatigue striations SEM imaging fatigue strength 42CrMo (chromium-molybdenum alloy steel) 38CrMoAl (chromium-molybdenum-aluminum alloy steel) Background A locomotive turbocharger main shaft and a bearing sleeve assembled...
Abstract
The main shaft in a locomotive turbocharger fractured along with an associated bearing sleeve. Visual and fractographic examination revealed that the shaft fractured at a sharp-edged groove between two journals of different cross-sectional area. The dominant failure mechanism was low-cycle rotation-bending fatigue. The bearing sleeve failed as a result of abrasive and adhesive wear. Detailed metallurgical analysis indicated that the sleeve and its respective journal had been subjected to abnormally high temperatures, increasing the amount of friction between the sleeve, bearing bush, and journal surface. The excessive heat also softened the induction-hardened case on the journal surface, decreasing its fatigue strength. Fatigue crack initiation occurred at the root fillet of the groove because of stress concentration.