Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Study on the Lubrication Characteristics at the Elevated Temperature in Hot Forging Test with Extruded AZ80 Mg Alloy

AZ80 압출재를 이용한 고온단조 윤활특성 분석

  • 윤종헌 (한국기계연구원 부설 재료연구소) ;
  • 이상익 (한국기계연구원 부설 재료연구소) ;
  • 전효원 (한국기계연구원 부설 재료연구소) ;
  • 이정환 (한국기계연구원 부설 재료연구소)
  • Received : 2013.01.23
  • Accepted : 2013.03.04
  • Published : 2013.04.01
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Abstract

This paper demonstrates the lubricant performance in T-shape hot forging of Mg alloys. This processes induces complex plastic material flow of the initial billet such as simultaneous compression and extrusion deformations. Five lubricants with different amounts of graphite are applied to the T-shape forging at temperatures of 300 and $350^{\circ}C$. As the amount of graphite in the lubricant increases, the extruded depth gradually increases, which improves hot forgeability for Mg alloys. However, the lubricant performance decreases as forging temperature increases from 300 to $350^{\circ}C$. As the punch stroke increases, forgeability is considerably influenced by the lubricant. Thus, the selection of lubricants in hot forging of Mg alloys is critical when plastic deformation is severe.

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References

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