Effect of Sand Mold Constraint on Warpage Deformation of Lamellar Graphite Gray Cast Iron and Prediction by Elastoplastic-Creep Finite Element Analysis

Muhammad Khairi Faiz, Kengo Uehara, Tomoki Nakajima, Toshitake Kanno, Yuichi Hiramoto, Tomoyuki Miyashita, Toshimitsu Okane, Makoto Yoshida

研究成果: Article査読

抄録

Casting that comprises multiple parts with different thicknesses is prone to experience warpage deformation due to the non-uniform temperature distribution from the beginning of solidification to room temperature. This study is the first to investigate the effect of sand mold shake-out timing on the warpage deformation of a lamellar graphite gray cast iron casting with thick and thin geometries by both experiment and finite element analysis. It was found that warpage deformation was suppressed by 81.6% when the shakeout was performed just after A1 (austenite to ferrite) phase transformation temperature rather than after eutectic solidification temperature. The elastoplastic-creep analysis was proven to predict the warpage amount better than elastoplastic analysis, in which prediction error was reduced by 116%. The introduction of creep term that should not contribute to the work-hardening of the casting was assumed to relax the stress and suppress the warpage deformation; however, poor estimation of the creep properties at about 1000 °C to the A1 transformation temperature reduced the prediction accuracy. A sudden increase of warpage was observed and predicted during shakeout due to the release of the elastic strain that was accumulated as a result of sand mold constraint.

本文言語English
ページ(範囲)4669-4680
ページ数12
ジャーナルJournal of Materials Engineering and Performance
30
6
DOI
出版ステータスPublished - 2021 6

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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