Failure Analysis of Train Vehicles Engagement Arm

This paper studies the failure reasons of train vehicles engagement arm. The arm ends with screw. From the statistical observation, it is found that the failure always happens in the screw region. The steel used in this engagement arm is carbon steel of 0.40C–0.26Si–0.68Mn–0.068Cr chemical compositi...

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Bibliographic Details
Published in:Journal of failure analysis and prevention 2015-10, Vol.15 (5), p.576-582
Main Authors: Farahat, Ahmed I. Z., Abdel Hamid, Z., Gomaa, Nasser
Format: Article
Language:English
Subjects:
Carbon steels
Case History > -Peer-Reviewed
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Corrosion and Coatings
Cracks
Failure
Failure analysis
Materials Science
Nonmetallic inclusions
Quality Control
Reliability
Safety and Risk
Screws
Segregations
Solid Mechanics
Tribology
Vehicles
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Summary:This paper studies the failure reasons of train vehicles engagement arm. The arm ends with screw. From the statistical observation, it is found that the failure always happens in the screw region. The steel used in this engagement arm is carbon steel of 0.40C–0.26Si–0.68Mn–0.068Cr chemical composition in wt.%. The non-metallic inclusions were followed and studied in the screw profile (root, flank, and matrix) using optical and SEM microscope. The tensile testing was carried out to compare with the standard values. Optical microstructure reveals ferrite-pearlite bands. EDS-SEM revealed that the segregation of Mg in the non-metallic inclusions creates micro-shrinkage porosity around the non-metallic working as stress concentrators during the service leading to catastrophic cracks.
ISSN:1547-7029
1728-5674
1864-1245
DOI:10.1007/s11668-015-9988-6