High strength and ductility of friction-stir-welded steel joints due to mechanically stabilized metastable austenite

SCRIPTA MATERIALIA

卷:70

Article

Fujii, Hidetoshi¹  Ueji, Rintaro¹  Morisada, Yoshiaki¹  Tanigawa, Hiroyasu² 

[1] Osaka Univ, Joining & Welding Res Inst, Osaka 5670047, Japan

[2] Japan Atom Energy Agcy, Aomori 0393212, Japan

关键词: Friction stir welding;    Steels;    Mechanical properties;    Microstructure;    Phase transformation;   

DOI  :  10.1016/j.scriptamat.2013.09.012

来源: Elsevier

【 摘 要 】

Steel plates were friction-stir-welded together under conditions in which samples were first heated above the lower critical temperature of the alloy and subsequently cooled at approximately 100 K s(-1). This method produced joints with an excellent balance between tensile strength and ductility. Severe plastic deformation during friction-stir-welding stabilized the austenite phase in the steel joints. The austenite phase was subsequently transformed through deformation into the martensite phase when the joints were actually used. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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