二相ステンレス鋼中のσ相, 炭化物, 窒化物の態別定量法及び析出挙動

概要

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A method for quantitative analysis of σ-phase, carbides and nitrides in duplex stainless steel was investigated and the analytical procedure has been established. And then, precipitation behavior of the σ-phase in duplex stainless steel was investigated by using this method. The results obtained are summarized as follows : (1) The residues adhered to the sample surface after potentiostatic electrolysis in 1%HCl-10% acetylacetone-methanol electrolyte (1%HA) can not be teared off by only ultrasonic cleaning, and in this case, the residues can be teared off by polishing the sample surface with a wire brush. (2) Only the σ-phase in the above mentioned precipitates is gradually dissolved by 10%Br_2-methanol dissolution treatment, and consequently the composition of the σ-phase can be analyzed by using this solution. (3) The precipitates except the σ-phase are quantitatively extracted by galvanostatic electrolysis in 10% tetramethyl ammoniumchloride-10% acetylacetone-methanol electrolyte (10%TMAC), and the amount and composition of carbides and nitrides can be analyzed. (4) The amount and composition of the σ-phase, carbides and nitrides can be analyzed by using the procedures from (1) to (3) and previous report. (5) The formation of the σ-phase is very fast at 1073K, and the amount of the σ-phase is quite larger than that of carbides and nitrides.
社団法人日本鉄鋼協会の論文
1989-10-01