Microstructure evaluation of UNS S32205 duplex stainless steel friction stir welds

Rem: Revista Escola de Minas

Tiago F. A. Santos²  Ricardo R. Marinho¹  Marcelo T. P. Paes¹  Antonio J. Ramirez¹ 

[1] ,UNICAMP FEM Dema

关键词: Friction stir welding;    duplex stainless steel;    microhardness;    corrosion;    Soldagem por atrito com pino não-consumível;    aços inoxidáveis duplex;    microdureza;    corrosão;   

DOI  :  10.1590/S0370-44672013000200008

来源: SciELO

【 摘 要 】

UNS S32205 duplex stainless steel welds were performed by friction stir welding (FSW). Advancing and retreating sides showed distinct characteristics in the welded joint. The advancing side shows the strongest grain refinement which is corroborated by microhardness measurements. The microstructure characterization was carried out by optical, scanning and transmission electron microscopy. The thermomechanically affected zone displays austenite islands deformed in a ferrite matrix. The stir zone (SZ) showed a fine recrystallized microstructure providing an outstanding increase of hardness associated with better corrosion performance. Transmission electron microscopy and corrosion tests have corroborated the absence of intermetallic phases on welded joints.

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