Effect of Temperature on Surface Cracking Defects in AA7075 Hot Extrusion

Tatsuya Funazuka*, Kuniaki Dohda, Norio Takatsuji, Kaito Takano, Ngernbamrung Sukunthakan

*この論文の責任著者

研究成果: 書籍の章/レポート/会議録会議への寄与査読

2 被引用数 (Scopus)

抄録

Aluminum alloys in the 7xxx series are high-strength alloys that are used in a wide variety of products in the transportation equipment and aerospace fields to reduce weight. In particular, the A7075 alloy has the highest strength and is expected to find further applications in a wide range of fields such as aircraft parts and sporting goods. However, low productivity is a problem due to its high deformation resistance, tendency to produce surface defects called tearing on the product surface, and short tool life. Tearing tends to occur under high temperature and high speed conditions, and is thought to be caused by local melting of Zn, an additive element, due to heat generation in processing. In this study, to improve the productivity of A7075 alloy, the profile was cooled during extrusion to prevent recrystallization of extrudate surface grains due to processing heat and to prevent processing heat during forming. In order to investigate the cooling effect, hot extrusion simulation was conducted. The cooling effect successfully suppressed the occurrence of tearing. These results indicate that cooling the extrudate during forming reduces the effect of heat generation during forming and prevents recrystallization of the extrudate surface grains and local melting of Zn.

本文言語英語
ホスト出版物のタイトル Key Engineering Materials
出版社Scientific.net
ページ409-415
ページ数7
926
ISBN(電子版)1662-9795
DOI
出版ステータス出版済み - 2022
イベント25th International Conference on Material Forming, ESAFORM 2022 - Braga, ポルトガル
継続期間: 2022/04/272022/04/29

学会

学会25th International Conference on Material Forming, ESAFORM 2022
国/地域ポルトガル
CityBraga
Period2022/04/272022/04/29

ASJC Scopus 主題領域

  • 材料科学一般
  • 材料力学
  • 機械工学

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