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Influence of the Quench Process on Microstructure Evolution in a Landing Gear Steel

[+] Author Affiliations
Samir Mourad Chentouf, Mohammad Jahazi

École de Technologie Supérieure, Montreal, QC, Canada

Rejean Fortin

Messier-Bugatti-Dowty Inc., Mirabel, QC, Canada

Paper No. IMECE2014-38636, pp. V08BT10A068; 4 pages
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 8B: Heat Transfer and Thermal Engineering
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4956-9
  • Copyright © 2014 by ASME


The quench process of large size components is always problematic owing to non-uniform phase formation. In this context, the influence of cooling rate on phase transformation, for different cooling rates, in 300M steel is studied. A combination of high resolution dilatometry, optical microscopy, Vickers micro hardness measurements were employed to accurately determine the critical transformation temperature, and to identify microstructure constituents (bainite, martensite, and retained austenite).

A mixture of bainite, martensite and some retained austenite phases were observed to appear at cooling rate of 0.25°C/sec whereas for a cooling rate of 50°C/sec the microstructure is totally martensitic.

Copyright © 2014 by ASME
Topics: Steel , Gears



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