Prediction method of crack sensitivity during DC casting of Al-Mn and Al-Mg series aluminum alloys

Makoto Morishita*, Mitsuhiro Abe, Kenji Tokuda, Makoto Yoshida

*この研究の対応する著者

研究成果査読

4 被引用数 (Scopus)

抄録

Since it has been difficult to predict a crack sensitivity depending on alloy composition during aluminum DC casting, a new prediction method based on a relation between calculated solid fraction and temperature was developed concerning Al-Mn and Al-Mg series aluminum alloys. In order to understand that the surface crack is located at ingot surface, two cracking modes were considered. They were due to "difference in strain between water chilling surface and mushy surface (crack mode Z)" and "difference in strain rate between surface and just inner surface (crack mode Y)". It's common knowledge that the material is cracked at high solid fraction region since melt cannot go into a crack gap and ductility is very low. Therefore we assumed the high solid fraction region was from 0.75 to 0.95 (Region II) and set up two indexes which are calculated from temperature difference (ΔT Π) and difference in a temperature drop per unit solid fraction ( ΔRΠ/ΔTΠ) within the Region II. By using the both indexes, which were called "Brittle temperature range" and "Parameter of the strain rate difference" respectively, the crack sensitivities through IX casting experiments were suitably represented.

本文言語English
ページ(範囲)417-423
ページ数7
ジャーナルKeikinzoku/Journal of Japan Institute of Light Metals
59
8
DOI
出版ステータスPublished - 2009 8

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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