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To investigate the precipitation behavior of super duplex stainless steel in its weld by friction stir welding (FSW) at a low welding speed, we carried out microstructural observation and analysis. An... intermetallic compound phase, σ, was observed in the heat affected zone (HAZ). The σ phase precipitated at the interfaces between δ-Fe (ferrite) and γ-Fe (austenite) grains 1 - 2 mm away from the stir zone (SZ)
HAZ boundary. On the other hand, the Cr2N phase was observed together with the belt-like γ-Fe grain aggregates in the vicinity of the advancing side (AS) of the SZ. The other intermetallic phase, χ, was also observed at a triple point of γ-Fe grains. One can interpret that the precipitation of the Cr2N and χ phases correlates with the transformation of δ-Fe to γ’-Fe (secondary austenite).続きを見る
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Mendeley出力
