ボロン含有１０Ｃｒ系耐熱鋼の長時間クリープ破断強度に及ぼすＣ，ＮおよびＮｉの効果

DOI Web Site Web Site 参考文献20件

書誌事項

タイトル別名
  • Effect of Carbon, Nitrogen and Nickel on Long-term Creep Rupture Strength of 10 Cr Steels Containing Boron
  • ボロン ガンユウ 10Crケイ タイネツ コウ ノ チョウジカン クリープハダンキョウド ニ オヨボス C N オヨビ Ni ノ コウカ

この論文をさがす

抄録

Microstructure and precipitates of creep ruptured specimens were investigated in order to understand the effects of carbon (C), nitrogen (N) and nickel (Ni) on long-term creep rupture strength of 10Cr heat-resistant steels containing boron (B). The low-N steels showed higher creep rupture strength than the high-N steels. In long-term creep rupture region such as over 10,000 h at 650°C, the deterioration of creep rupture strength was not observed in the low-N, high-C steel. On the other hand, the creep rupture strength of the low-N, low-C steel dropped to the strength level of the high-N steels. The addition of N to the B containing steels promoted the recovery of microstructure. The formation of coarse BN in the high-N steels led to the decrease of the amount of effective B that dissolved in M23(C,B)6 and suppressed its coarsening. From EDS analysis of precipitates, the fraction of M23C6 in the low-C steels was less than that in the high-C steels, while the fraction of coarse Laves phase in the low-C steels was more than that in the high-C steels. In the low-N, low-C steel, the coarsening of precipitates caused the deterioration of the creep rupture strength after 10,000 h exposure. Ni lowered Ac1 and Ac3 transition temperature, but it did not affect the fraction of precipitates according to the calculation of thermodynamic equilibrium using Thermo-Calc. It is concluded that C and N are more effective to the stability of microstructure than Ni.

収録刊行物

  • 鉄と鋼

    鉄と鋼 97 (5), 295-304, 2011

    一般社団法人 日本鉄鋼協会

参考文献 (20)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ