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Failure Analysis of Train Vehicles Engagement Arm

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Abstract

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.

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References

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Authors and Affiliations

  1. Deformation of Metals Department, Thermo Mechanical Processing, Central Metallurgical Research and Development Institute (CMRDI), Helwan, Cairo, Egypt

    Ahmed I. Z. Farahat

  2. Corrosion Control and Surface Protection Laboratory, Central Metallurgical Research & Development Institute (CMRDI), Helwan, Cairo, P.O.8 7, Egypt

    Z. Abdel Hamid

  3. Senior Engineer of Technical Service, CMRDI, Helwan, Cairo, Egypt

    Nasser Gomaa

Authors
  1. Ahmed I. Z. Farahat
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  2. Z. Abdel Hamid
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  3. Nasser Gomaa
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Correspondence to Z. Abdel Hamid.

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Farahat, A.I.Z., Abdel Hamid, Z. & Gomaa, N. Failure Analysis of Train Vehicles Engagement Arm. J Fail. Anal. and Preven. 15, 576–582 (2015). https://doi.org/10.1007/s11668-015-9988-6

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  • DOI: https://doi.org/10.1007/s11668-015-9988-6

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