Relationship between creep strength and magnetic properties of cobalt-bearing high chromium ferritic steel

研究成果: ジャーナルへの寄稿学術誌査読

抄録

In this study, the relation between the change of the magnetic properties and the creep strength with the addition of Co was investigated for ferritic steel containing 15 mass%Cr. Co addition up to 6 mass% hardly contributes to solid solution strengthening and precipitation strengthening at room temperature. However, in the range of 650ºC to 750ºC, it was confirmed that the addition of Co was effective for the creep strengthening because the steel with a larger amount of Co had higher creep strength. This creep strengthening is explained by a reduction in the diffusion rate associated with a change in magnetic properties by Co addition. The increase of the volume magnetization of the steel with increase of Co amount in the temperature range from room temperature to about 800ºC was confirmed. Comparing the difference in volume magnetization and the ratio of creep strain rate for steels with different amounts of Co, a clear correlation was found between the values. That is, at the temperature at which the difference in volume magnetization becomes maximum, the peak of the creep strain rate ratio was observed. This result is explained as follows. In a low temperature region where the magnetization is large or in a high temperature region above the Curie point of both steels, there is no significant difference in the creep strength between them. However, in the temperature where one steel loses the ferromagnetism but the other steel maintains ferromagnetism, a significant difference in the creep strength was observed.

本文言語英語
ページ(範囲)788-798
ページ数11
ジャーナルTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
106
11
DOI
出版ステータス出版済み - 2020

!!!All Science Journal Classification (ASJC) codes

  • 凝縮系物理学
  • 物理化学および理論化学
  • 金属および合金
  • 材料化学

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