Journal of Failure Analysis and Prevention

, Volume 15, Issue 6, pp 775–781 | Cite as

Investigation of the Shaft Failure Connected to Extruder

  • S. S. Pelaseyed
  • F. Mashayekhi
  • A. Movahedi-Rad
Case History---Peer-Reviewed


In this study, the failure analysis of a shaft of a unit, which had been failed during the service, was studied. This shaft was welded to the blades, and their chemical compositions were determined by spectroscopy method. In order to determine the root cause of failure and contribution factors, different investigation methods including visual examination, optical microscopy and scanning electron microscope analysis, and hardness test were carried out. It was concluded that the shaft was failed due to fatigue. The failure was caused by improper welding of blades to the shaft. At the end, in order to prevent or decelerate such failure, some recommended remedies were suggested.


Failure analysis Fatigue Fracture surface Ratchet mark Weld metal HAZ Steel 


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Copyright information

© ASM International 2015

Authors and Affiliations

  • S. S. Pelaseyed
    • 1
  • F. Mashayekhi
    • 2
  • A. Movahedi-Rad
    • 2
  1. 1.Department of Materials Science and EngineeringSharif University of TechnologyTehranIran
  2. 2.School of Metallurgical and Materials Engineering, College of EngineeringUniversity of TehranTehranIran

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