検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

9Cr-W-Mo-V-Nb鋼の長時間クリープ特性に及ぼす熱処理の影響

Influence of heat treatment on long term creep properties of 9Cr-W-Mo-V-Nb steel

小原 智史; 若井 隆純 ; 浅山 泰 ; 山田 芳之*; 中澤 崇徳*; 山崎 政義*; 本郷 宏通*

Obara, Satoshi; Wakai, Takashi; Asayama, Tai; Yamada, Yoshiyuki*; Nakazawa, Takanori*; Yamazaki, Masayoshi*; Hongo, Hiromichi*

高クロム鋼の高温強度特性の長時間安定性の向上に向けた検討として、既存高クロム鋼に対し広範囲かつ系統的に変化させた熱処理を施し、クリープ破断特性に及ぼす熱処理の影響について評価した。また、それら熱処理の影響の長時間有効性について検討するとともに、FBR用高クロム鋼の熱処理条件の最適化に向けた検討を行った。

This paper describes the effect of heat treatment on mechanical properties of 9Cr-W-Mo-V-Nb steel as a part of development of high Cr steel for fast breeder reactor (FBR). The effects of normalizing temperature and tempering temperature and time on creep properties were investigated from the viewpoint of microstructures. Creep strength increased with increase in normalizing temperature from 950$$^{circ}$$C to 1200$$^{circ}$$C. The microstructural factors that improve creep strength are increased amount of MX which precipitated during tempering process and increased dislocation density. In addition, coarsening of prior austenite grain size also contribute to increasing creep strength. Although creep rupture time of 780$$^{circ}$$C-1h tempering specimen was greater than that of 700$$^{circ}$$C-1h and 750$$^{circ}$$C-1h tempering specimen in a long-term region exceeding 20000h at 650$$^{circ}$$C, creep ductility and reduction of area of the former remarkably degraded compared to those of the latter.

Access

:

- Accesses

InCites™

:

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.