δ/γ 2 相ステンレス鋼における M_<23>C_6 とσ相の析出

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Precipitation of M_<23>C_6 and σ-phase during isothermal aging of δ/γ duplex stainless steels has been studied mainly by means of transmission electron microscopy coupled with energy dispersive X-ray analysis. M_<23>C_6 particles form either at γ/γ or at γ/δ boundaries. The particles are crystalographically related to either one of the γ grains at γ/γ boundaries or the γ grain at γ/δ boundaries. The M_<23>C_6 particles nucleating at γ/δ interface boundaries grow into the untransformed δ-ferrite as an M_<23>C_6/new γ eutectoid structure. The habit plane is the {111}_γ//{111}_<M_<23>C_6>, which is most parallel to the edgewise growth direction. Since C atoms forming M_<23>C_6 are supplied from the γ behind the eutectoid structure, the reaction will finally stop after entire consumption of C atoms. Then σ-phase particles nucleate on the δ/new γ interface boundary in Nenno orientation relationship with the new γ, and grow into the δ-ferrite as a σ/δ cellular structure with the (001)_σ//(111)_γ habit plane. In some cases, impingements between σ and γ grains nucleating separately occur, and result in a tangled eutectoid structure without any specific orientation relationship. Since the partition of alloying elements between γ and δ-ferrite phases accelerates precipitation of both M_<23>C_6 and σ-phase, the solution treatment in the δ-ferrite single phase region largely retards these reactions.
社団法人日本鉄鋼協会の論文
1984-03-01

δ/γ 2 相ステンレス鋼における M_<23>C_6 とσ相の析出

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