高Crフェライト鋼の遷移クリープ変形に及ぼす固溶Mo及びWの効果

概要

論文の詳細を見る
The creep behaviour of martensitic 9% chromium steels and the steels alloyed with Mo and W was investigated at temperature of 600 to 650℃ under stress of 160 to 168 MPa. The results showed that the creep curves of these alloys were similar to those observed for martensitic 9-12% chromium steels. The minimum creep rate of ε^^._<min> for model steels alloyed with Mo and W was one order of magnitude lower than ε^^._<min> in base steel. Also it is found that transient creep stage is controlled by glide using the stress-change technique under the present experimental condition. Furthermore, the changes of strengthening factor can be described as a function of the solute mole fraction, C, times the second power of the size-misfit parameter, ε^2_b. In the range of high W mole fraction, however, the changes of strengthening factor deviate from the linear relation line which represents C×ε^2_b. This is suggested that transient creep of these alloys with high W mole fraction is controlled by cluster hardening, in addition to solid solution hardening.
社団法人日本鉄鋼協会の論文