Effect of Nitrogen on the High Temperature Creep Behavior of 9Cr-2Co Steel.

DOI Web Site 被引用文献5件 参考文献20件
  • Hara Ken-ichiro
    Graduate School, Yokohama National University
  • Aoki Hajime
    Graduate School, Yokohama National University
  • Masuyama Fujimitsu
    Nagasaki Research and Development Center, Mitsubishi Heavy Industries, Ltd.
  • Endo Takao
    Department of Mechanical Engineering and Material Science, Yokohama National University

この論文をさがす

抄録

Constant load creep tests were conducted at 873, 898 and 923 K under an initial stress of 50, 60 or 70 MPa to examine the effect of nitrogen addition (0.06, 0.11, 0.16 and 0.19 mass%) on the creep behavior of a 9mass%Cr-2mass%Co ferritic steel. Extraction residue analysis showed that 240 to 410 ppm of nitrogen was present as solid solution. The rest of the nitrogen existed as nitride precipitates. The creep rate decreased while creep rupture life increased with an increase in nitrogen content. It is also observed that the higher the nitrogen, the shorter the creep rupture strain. A state equation for creep could be represented as; ε0=A0σ0nexp(-Q0/RT ), where ε0 is the imaginary initial strain rate defined in the text, A0 is a constant, n is the stress exponent and Q0 is the apparent activation energy. The mean values of n and Q0 were 4.5 and 360 kJ/mol, respectively. The Orowan stress for specimens crept at 873 K and 70 MPa was estimated from the measurement of mean interparticle spacing obtained by TEM study. The resultant values are 15, 22, 30 and 38 MPa for specimens containing 0.06, 0.11, 0.16 and 0.19 mass% nitrogen, respectively.

収録刊行物

被引用文献 (5)*注記

もっと見る

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