高温疲れにともなう炭素鋼のかたさ変化について

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  • The Effect of Rotatory Bending Stress at High Temperature on the Hardness of Carbon Steel
  • コウオン ツカレ ニ トモナウ タンソ コウ ノ カタサ ヘンカ ニ ツイテ

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We measured the micro-Vickers hardness of 0.26 %-carbon steel, which had been subjected to rotatory bending stress at a high temperature. The fatigue test was conducted at the room temperature, 300°C and 550°C mainly, and hardness testing was held under 1000 gram load. Summary of the results is as follows : (l) At 300°C, the increase of the hardness number is greater and the hardening layer is deeper than that at the room temperature. But at 550°C, the hardness change is little or nothing. (2) Moreover, this hardening layer is caused by the repeated stress above about 0.8 σω at the room temperature, but about 0.65 σω at 300°C, where σω is the endurance limit at each temperature.

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