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Effect of V and Nb on precipitation behavior and mechanical properties of high Cr steel

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鬼澤 高志  ; 若井 隆純 ; 安藤 勝訓 ; 青砥 紀身 

Onizawa, Takashi; Wakai, Takashi; Ando, Masanori; Aoto, Kazumi

バナジウム(以下、V)およびニオブ(以下、Nb)に着目し、MX析出強化機構の長時間有効性・安定性に関する検討を目的に、V・Nbの添加量の異なる高Cr鋼試作材を作製した。それらの受入材および600$$^{circ}$$C$$times$$6000h時効材について、各種材料強度試験および組織観察・分析を実施し、機械的性質および組織安定性に及ぼすこれらの添加量の影響について調べた。

This paper studies the long term efficiency and stability of strengthening mechanisms provided by V and Nb in high chromium ferritic steels. These elements are believed to improve the high temperature strength of high Cr steels by precipitating as carbides and/or nitrides, namely fine MX particles. However, the long term efficiency and stability of such precipitation strengthening mechanisms provided by the fine MX particles have not been clarified yet. A series of trial products controlling V and Nb contents is produced and mechanical tests are conducted to investigate the effect of these elements on the mechanical properties and the long term stability of the MX strengthening mechanism. Before and after a long term aging process, metallurgical examinations and quantitative analyses are conducted to investigate the effect of these elements on the microstructure evolutions. Based on these results, the long term efficiency and stability of the strengthening mechanisms provided by the fine MX particles are discussed.

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パーセンタイル:90.98

分野:Nuclear Science & Technology

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