Effect of γ-Phase Stability on Local Deformation Energy for α-γ Duplex Stainless Steel

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  • フェライト─オーステナイト二相ステンレス鋼のオーステナイト安定性と局部変形エネルギー
  • フェライト-オーステナイト二相ステンレス鋼のオーステナイト安定性と局部変形エネルギー
  • フェライト-オーステナイト ニソウ ステンレスコウ ノ オーステナイト アンテイセイ ト キョクブ ヘンケイ エネルギー

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<p>Effect of austenite（γ）phase stability in local deformation region on deformation energy of ferrite（α）-γ duplex stainless steel obtained by tensile test was investigated. The results revealed that uniform deformation energy showed the same value for both γ-stable and unstable duplex stainless steels. On the other hand, local deformation energy of γ-stable duplex stainless steel was larger comparing γ-unstable duplex stainless steel. In γ-unstable duplex stainless steel, nano-indentation hardness difference between α and transformed martensite （α′） phases increased remarkably beneath fractured surface. Low voltage FE-SEM observations revealed that voids grew rapidly at the grain boundary between α and α′ phases beneath the fractured surface.</p><p>From these results, it was concluded that the amount of local deformation energy in γ-unstable duplex stainless steel decreased due to the rapid void-growth at the grain boundary between α and α′ phases beneath the fracture surface.</p>

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  • NETSUSHORI

    NETSUSHORI 56 (5), 285-291, 2016

    The Japan Society for Heat Treatment

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