高Cr耐熱鋼中の炭化物, Laves相の形態別定量法
1992 年 78 巻 4 号 p. 594-600
詳細
1992 年 78 巻 4 号 p. 594-600
A method for quantitaive analysis of Laves phase and M23C6 type carbide in high Cr heat resistance ferritic steel has been estab lished, and precipitation behavior of the Laves phase and carbide in these steels were investigated. The results obtained are as follows.
(1) The Laves phase and carbide are quantitatively extracted by potentiostatic electrolysis in 10% AA-1% TMAC-methanol electrolyte or in 10 %HCl-methanol electrolyte.
(2) Only the Laves phase in the residues extracted by above electrolysis can be dissolved in 0.5% Br2-methanol solution at 20°C for over 90 minutes. Consequently, the amount and chemical composition of the Laves phase and carbide can he determined by analysis of this treatment solution and the residues respectively.
(3) The amount of the Laves phase increased with an increasing of aging time, while the amount of carbide remained constant.
(4) The chemical composition of the Laves phase and carbide were independent of aging time, and approxiamately constant.
