Effect of Cooling Rate below Ms Temperature on Hydrogen Embrittlement of TRIP-Aided Martensitic Steels

Naoya Kakefuda; Shintaro Aizawa; Ryo Sakata; Junya Kobayashi; Goroh Itoh; Tomohiko Hojo

doi:10.4028/www.scientific.net/MSF.1016.654

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Effect of Cooling Rate below Ms Temperature on Hydrogen Embrittlement of TRIP-Aided Martensitic Steels
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HomeMaterials Science ForumMaterials Science Forum Vol. 1016Effect of Cooling Rate below Ms Temperature on...

Effect of Cooling Rate below Ms Temperature on Hydrogen Embrittlement of TRIP-Aided Martensitic Steels

Abstract:

Low alloy TRIP steel is expected to be applied to automobile bodies because of its high strength, high ductility, and excellent impact properties and press formability. It has been reported that the low alloy TRIP steel of hydrogen embrittlement resistance is improved by utilizing the hydrogen storage characteristics of highly stable retained austenite. Therefore, for the purpose of increasing the volume fraction of retained austenite, it was produced at various cooling rates below the martensite transformation start temperature. As a result, the volume fraction of retained austenite increased, and then the effect of hydrogen embrittlement decreased. The matrix phase and retained austenite is refined with decrees of the cooling rate. It is considered that the size and surface area of the retained austenite also affected the improvement of hydrogen embrittlement resistance.

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Periodical:

Materials Science Forum (Volume 1016)

Pages:

654-659

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.1016.654

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Online since:

January 2021

Authors:

Naoya Kakefuda*, Shintaro Aizawa, Ryo Sakata, Junya Kobayashi, Goroh Itoh, Tomohiko Hojo

Keywords:

Bainite, Hydrogen Embrittlement, Martensite, Retained Austenite, TRIP-Aided Steel

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