デンドライトの2次アームの間隔におよぼす溶質含有量の影響
1970 年 34 巻 9 号 p. 925-929
詳細
1970 年 34 巻 9 号 p. 925-929
The effect of the carbon content on the secondary dendrite arm spacing in Fe-C alloys has been investigated. In the case of a constant cooling rate during solidification, it has been shown that the arm spacing is independent of the carbon content under 1.8%C, and that it decreases with increasing carbon content in the range of 1.8∼3.8%C. And the experiment on isothermal holding in the freezing range during solidification has shown that the effect of holding temperature on the arm spacing can be neglected.
These results have been discussed on the basis of the “coarsening” model proposed by Kattamis et al.. It is found that the results can be explained well by this model, and that the decrease of the arm spacing above 1.8%C arises from the large contribution of ΔT⁄C (ΔT: freezing range, C: concentration).
A similar analysis has been performed on the experimental data of Al-Cu alloys in the published papers, and it has been shown that the data agree well with the relationship predicted by the model.
