Unusual fatigue behavior of friction-stir welded Al-Mg-Si alloy

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:760

Article

Vysotskiy, Igor¹  Malopheyev, Sergey¹  Rahimi, Salaheddin²  Mironov, Sergey¹  Kaibyshev, Rustam¹ 

[1] Belgorod Natl Res Univ, Lab Mech Properties Nanostruct Mat & Superalloys, Pobeda 85, Belgorod 308015, Russia

[2] Univ Strathclyde, AFRC, 85 Inchinnan Dr, Inchinnan PA4 9LJ, Renfrew, Scotland

关键词: Heat treatable aluminum alloys;    Friction-stir welding;    Fatigue;    Microstructure;    Residual stress;   

DOI  :  10.1016/j.msea.2019.06.005

来源: Elsevier

【 摘 要 】

In this work, high-cycle fatigue behavior of friction-stir welded AA6061-T6 was studied. An emphasis has been made on the inter-relationship between microstructure, residual stress and fatigue resistance. The welds were produced under optimized conditions, including a combination of relatively high welding temperature and rapid cooling rate, and subsequently undergone a standard post-weld aging heat treatment. The optimized welds exhibited excellent fatigue performance that was comparable (or even superior) to that of the base material. This result was attributed to a considerable grain refinement in the stir zone, subtle material softening in the heat affected zone as well as to significant residual stress generated during the optimized FSW.

【 授权许可】

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