Investigation of surface cracking of hot-extruded AA7075 billet

Sukunthakan Ngernbamrung, Yudai Suzuki, Norio Takatsuji, Kuniaki Dohda

Research output: Contribution to journalConference article

Abstract

Extrudability of AA7075 is determined by tearing occurring through extrusion conditions by extrusion limit diagram relating to temperatures and speeds. Extruded parts were observed for tearing appearance and analyzed elements. As results, localization of melting by local heat generated by friction coupled with tension stress and zinc-segregated concentration stimulates tearing sensitivity. Furthermore, at small grain region, zinc-segregated concentration is well scattered without tearing. Therefore, an attempt to control microstructure in die by a newly-developed twist-groove porthole die is proposed to induce large severe deformation in die leading to grain refinement reducing tearing sensitivity to accelerate speed in hot extrusion.

Original languageEnglish (US)
Pages (from-to)217-224
Number of pages8
JournalProcedia Manufacturing
Volume15
DOIs
StatePublished - Jan 1 2018
Event17th International Conference on Metal Forming, METAL FORMING 2018 - Toyohashi, Japan
Duration: Sep 16 2018Sep 19 2018

Fingerprint

Extrusion
Zinc
Grain refinement
Melting
Friction
Microstructure
Temperature
Hot Temperature

Keywords

  • Aluminum alloy 7075
  • Hot extrusion
  • Porthole die
  • Surface cracking
  • Tearing

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Artificial Intelligence

Cite this

Ngernbamrung, Sukunthakan ; Suzuki, Yudai ; Takatsuji, Norio ; Dohda, Kuniaki. / Investigation of surface cracking of hot-extruded AA7075 billet. In: Procedia Manufacturing. 2018 ; Vol. 15. pp. 217-224.
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Investigation of surface cracking of hot-extruded AA7075 billet. / Ngernbamrung, Sukunthakan; Suzuki, Yudai; Takatsuji, Norio; Dohda, Kuniaki.

In: Procedia Manufacturing, Vol. 15, 01.01.2018, p. 217-224.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Investigation of surface cracking of hot-extruded AA7075 billet

AU - Ngernbamrung, Sukunthakan

AU - Suzuki, Yudai

AU - Takatsuji, Norio

AU - Dohda, Kuniaki

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Extrudability of AA7075 is determined by tearing occurring through extrusion conditions by extrusion limit diagram relating to temperatures and speeds. Extruded parts were observed for tearing appearance and analyzed elements. As results, localization of melting by local heat generated by friction coupled with tension stress and zinc-segregated concentration stimulates tearing sensitivity. Furthermore, at small grain region, zinc-segregated concentration is well scattered without tearing. Therefore, an attempt to control microstructure in die by a newly-developed twist-groove porthole die is proposed to induce large severe deformation in die leading to grain refinement reducing tearing sensitivity to accelerate speed in hot extrusion.

AB - Extrudability of AA7075 is determined by tearing occurring through extrusion conditions by extrusion limit diagram relating to temperatures and speeds. Extruded parts were observed for tearing appearance and analyzed elements. As results, localization of melting by local heat generated by friction coupled with tension stress and zinc-segregated concentration stimulates tearing sensitivity. Furthermore, at small grain region, zinc-segregated concentration is well scattered without tearing. Therefore, an attempt to control microstructure in die by a newly-developed twist-groove porthole die is proposed to induce large severe deformation in die leading to grain refinement reducing tearing sensitivity to accelerate speed in hot extrusion.

KW - Aluminum alloy 7075

KW - Hot extrusion

KW - Porthole die

KW - Surface cracking

KW - Tearing

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