高温硬度計による軟鋼の歪時効硬化の研究

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  • Study of Age-Hardening of Soft Steel by Means of High-Temperature Hardness Meter
  • コウオン コウドケイ ニ ヨル ナンコウ ノ ワイ ジコウ コウカ ノ ケンキュウ

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The phenomenon which is called strain-aging reaction—the hardening of metal by aging reaction after cold working—brings us face to face with various problems. It was confirmed that strain-age hardening is caused by C and N dissolved in α iron, and the phenomenon in consequence of fixing C or N as TiC or TiN by can be nearly totally prevented adding proper amount of Ti, and extremely decreasing the amount of C or N dissolved in α iron. But there is no definite theory on the influence of small amount of C or N dissolved in α iron on strain-aging reaction. In our research in connection with the age hardening phenomenon, the hardness of mild steel was measured at various temperature in the range from room temperature to 340°C, using specimens of 0.07%C steel, in which were the amount of C or N being dissolved in α iron was variously increased or decreased by heat treatment. As the result it was found that the 1st peak of hardness occured by coagulation of C or N in the vicinity of the dislocation at various temperature below 200°C according to the solubility of C or N in α iron, and the 2nd peak was caused by recovery of N in α iron at temperature from 210°C to 240°C.

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