Zr 添加 18-12 ステンレス鋼におよぼす熱処理の影響 : Zr 添加 18-12 ステンレス鋼の研究 I

概要

論文の詳細を見る
Thirteen kinds of austenitic 18-12 stainless steels containing zirconium up to 2.81% were melted in vacuum. The behaviors of carbide, nitride and some other phases in the forged specimens of these steels during heat treatments were studied by examining the austenite grain size, hardness and microscopic structures. At the same time, these phases were extracted from these specimens electrolytically and identified by the X-ray analyses or electron-diffraction method. Results obtained are as follows ; (1) Austenite grain size of 18-12 stainless steel is refined by the addition of a small amount of zirconium such as 0.02%. (2) The microstructures of each ingot containing zirconium shows the precipitation of ZrC and the quantity of ZrC is increased as the content of zirconium is increased. An intermetallic compound Fe_2Zr is found in the steels containing zirconium higher than 1.15%. In addition to these phases, some zirconium nitrides of cubic structure are found in each steel. (3) In the specimens solution-treated at 1100℃ for 3h, M_<23>C_6 dissolves into the matrix, but, even in steels containing a small amount of zirconium. a part of ZrC remains as the undissolved carbide. Though the solution treatment at higher temperature such as 1300℃ causes the austenite grain growth and decreases hardness, it is impossible to dissolve ZrC completely. (4) Burning structures are found on the austenite grain boundaries and the intermetallic compound Fe_2Zr is dissolved by the solution treatment at 1300℃ for 3h. (5) The precipitation of M_<23>C_6 is observed in the specimens containing a small amount of zirconium by annealing at 600℃ for 100h, but the quantity of this precipitant is decreased as the content of zirconium is increased, and this carbide is not observed microscopically in the specimen containing 0.87% zirconium. (6) The precipitation of M_<23>C_6 is accelerated by annealing at 900℃ and the carbide is already observed at this annealing temperature within 5h. (7) M_<23>C_6 cannot be observed in the specimens annealed at 1000℃ while ZrC seems to be precipitated at this temperature within 100h. (8) This carbides M_<23>C_6 is identified to be (Fe・Cr)_<23>C_6 from the results of electron-diffraction pattern.
社団法人日本鉄鋼協会の論文
1962-08-01

Zr 添加 18-12 ステンレス鋼におよぼす熱処理の影響 : Zr 添加 18-12 ステンレス鋼の研究 I

スポンサーリンク

概要

著者

関連論文

スポンサーリンク