17Cr-14Ni 鋼の高温クリープ特性に及ぼす結晶粒度の影響(高温の組織と強度)(<特集>耐熱鋼・耐熱合金)

概要

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The effect of grain size, ranged from 22 to 404μm, on the creep behavior of carbon free 17Cr-14Ni steel was studied at the temperature of 850 and 900℃. The creep properties, mainly steady state-or minimum-creep rate, strongly depend on the grain size, that is, 1] steady state creep rate, ε^^._s, is independent of grain size for the grain sizes from 100 to 200μm, where ε^^._s reaches the minimum, 2] below about 100μm, ε^^._s increases with the decrease of grain size, whereas, 3] above about 200μm, ε^^._s increases with the increase of that. From the measurement of internal stress (σ_i) and the observation of the microstructures, it was concluded that under the constant applied stress the increase in ε^^._s with the decrease of grain size is attributable to the increase of effective stress, σ_e=σ_a-σ_i, where σ_a is the applied stress. On the other hand, the recrystallization at the grain boundary triple points between large grains induced by the stress concentration seems to increase ε^^._s with the increase of grain size above 200μm.
社団法人日本鉄鋼協会の論文
1979-06-01