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Failure analysis of holding U-bolts of an automobile wheels

Behjati, P ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1016/j.engfailanal.2008.09.014
  3. Publisher: 2009
  4. Abstract:
  5. Holding U-bolts of an automobile wheels are manufactured from 10B21 boron steel rods. Changing the source of the rods from X to Y, with an identical manufacturing procedure, it was observed that parts fracture at the mechanical straightening stage (final stage of the manufacturing line). In this case study, microscopy techniques and mechanical tests were used to identify the cause of this failure. It was shown that higher contents of carbon and boron of the source Y rods promotes precipitation of boron containing carbides along the grain boundaries. These precipitates act as crack nucleation sites and are responsible for the fracture of the parts under the straightening stage stresses. Based on the results, an optimum tempering temperature was suggested for the source Y parts to solve the problem. © 2008 Elsevier Ltd. All rights reserved
  6. Keywords:
  7. 10B21 boron steel ; Boron-containing ; Crack nucleations ; Failure ; Manufacturing lines ; Manufacturing procedures ; Mechanical tests ; Microscopy techniques ; Steel rods ; Tempering temperatures ; Automobile parts and equipment ; Boron ; Boron carbide ; Failure analysis ; Grain boundaries ; Microstructure ; Nonmetals ; Quality assurance ; Safety factor ; Steel ; Vehicles ; Wheels ; Yttrium alloys ; Fracture
  8. Source: Engineering Failure Analysis ; Volume 16, Issue 5 , 2009 , Pages 1442-1447 ; 13506307 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S1350630708001982