Tensile properties of Co-added FeCrAl oxide dispersion strengthened alloy

JOURNAL OF ALLOYS AND COMPOUNDS

卷:852

Article

Zhang, Shenghua¹  Ukai, Shigeharu²  Aghamiri, S. M. S.²  Oono, Naoko²  Hayashi, Shigenari² 

[1] Hokkaido Univ, Grad Sch Engn, Kita Ku, Kita 13,Nishi 8, Sapporo, Hokkaido 0608628, Japan

[2] Hokkaido Univ, Fac Engn, Kita Ku, Kita 13,Nishi 8, Sapporo, Hokkaido 0608628, Japan

关键词: FeCrAl;    ODS;    Cobalt addition;    Aging treatment;    Mechanical properties;    Order strengthening;   

DOI  :  10.1016/j.jallcom.2020.156956

来源: Elsevier

【 摘 要 】

The Co-added FeCrAl oxide-dispersion-strengthened (ODS) alloy developed by the authors enables easy and precise control of the grain morphology and hardness using alpha/gamma phase transformation during manufacturing. The tensile properties of the transformable Co-added FeCrAl-ODS alloy were evaluated, focusing on the oxide dispersion strengthening and B2-type CoAl ordered strengthening at both ambient and elevated temperatures. The oxide particles and B2-type CoAl precipitate were characterized using transmission electron microscopy, and strengthening mechanisms for the oxide particles and CoAl-precipitate were evaluated by hardness and tensile tests at room temperature, 300 degrees C, and 500 degrees C. The theoretically estimated values showed good agreement with the experimental results at RT and 300 degrees C. However, the order strengthening by CoAl precipitates was significantly reduced at 500 degrees C, which was attributed to the increase of thermally activated < 001 > slip in the body-centered cubic matrix. The < 001 > slip weakened the dislocation interaction with CoAl precipitates with the same < 001 > slip system. (C) 2020 Elsevier B.V. All rights reserved.

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