10 Cr 耐熱鋼のクリープ破断強度及び常温靱性に及ぼす Mo と W 量の影響

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With the Mo equivalents (wt%Mo+1/2wt%W) being within the range of 1.2-1.6%, the effects of Mo and W contents on creep rupture strength and toughness have been investigated for a 10 Cr heat resistant steel. (1) With the Mo equivalent being a constant of 1.2, variation in W and Mo contents shows little effect on the toughness and on the creep rupture properties at under 600℃ as well as on the short-term side of higher temperatures, but the steel containing more W shows higher creep rupture strength on the long-term side of 700℃. (2) The steels containing more Mo or W show lower toughness when heated at 600℃, but increased creep rupture strength at 600℃ as well as on the short-term side of higher temperatures. The change is related to the fact that the increase in Mo or W content enhances both solution hardening and precipitation hardening under the conditions mentioned above. However, the increase in Mo or W content has no any beneficial effect on the long-term creep rupture strength at above 650℃. The increased coarsening tendecy of precipitates resulting from the increase in Mo or W content was considered the factor detrimental to the creep rupture strength on the long-term side at above 650℃. (3) The steels developed in this study show a extrapolated 10^5 h creep rupture strength of as high as 15-20 kgf/mm^2 at 600℃ and 7-9 kgf/mm^2 at 650℃. It is evaluated that these steels would be applicable at up to 621℃ as the rotor material.
社団法人日本鉄鋼協会の論文
1988-03-01

10 Cr 耐熱鋼のクリープ破断強度及び常温靱性に及ぼす Mo と W 量の影響

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