Observation and Analysis of Sigma Phase in Steels Using the Non-aqueous Electrolyte-Potentiostatic Etching Method

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  • 非水溶媒系電解液定電位電解エッチング法による鉄鋼中のσ相の観察と分析
  • ヒミズヨウバイケイ デンカイエキ テイデンイ デンカイ エッチングホウ ニ ヨル テッコウ チュウ ノ sソウ ノ カンサツ ト ブンセキ

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The sigma phase in austenitic stainless steels has been studied using the non-aqueous electrolyte-potentiostatic etching method (the SPEED method) and the potentiostatic isolation method.<BR>The results obtained are summarized as follows.<BR>(1) Three-dimensional observation of sigma phase on grain boundaries in austenitic stainless steel are successfully conducted by the SPEED method.<BR>(2) Sigma phase, carbide (Cr23C6) and nitride (β-Cr2N) are found to be stable when the steel matrix is electrolyzed at +100∼+300 mV vs SCE in 10% acetylacetone-1% tetramethy-lammonium chloride-methyl alcohol electrolyte.<BR>(3) The amounts of carbide (Cr23C6) and nitride (β-Cr2N) are calculated from carbon and nitrogen contents, respectively, which are obtained from the analytical results of the residues isolated by the potentiostatic method.<BR>(4) The amount of the sigma phase is calculated by subtraction of the carbide and nitride amounts from the total amount of the precipitates isolated potentiostatically.<BR>(5) The precipitation behavior of the sigma phase, Cr23C6 and β-Cr2N as a function of the aging time is clear by the above-mentioned analytical data.<BR>(6) Relationship between sigma phase contents determined by the proposed method and the charpy impact values is evident and the sigma phase plays a major role in lowering the toughness.

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