한국소성가공학회:학술대회논문집 (Proceedings of the Korean Society for Technology of Plasticity Conference)

한국소성∙가공학회 (The Korean Society for Technology of Plasticity and materials processing)
권호 표지

Ti-6Al-4V 합금의 ECAP 가공시 미세 조직의 변화 연구

Microstructural Evolution during the Equal Channel Angular Pressing of Ti-6Al-4V Alloy

  • 고영건 (신소재공학과, 포항공과대학교) ;
  • 정원식 (금속재료공학과, 한양대학교) ;
  • 신동혁 (금속재료공학과, 한양대학교) ;
  • 이종수 (신소재공학과, 포항공과대학교)
  • 발행 : 2002.05.01
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초록

The effects of pressing temperatures on the formability and the microstructural evolution during equal channel angular pressing (ECAP) of lamellar Ti-6Al-4V alloy were investigated in this study. ECAP above isothermally 600$^{\circ}C$ was successful without producing any noticeable segments at the specimen surfaces after a single pass of pressing. After 4 passes of ECA pressing, lamellar microstructures were significantly refined revealing equiaxed grains of 0.3$\mu\textrm{m}$ in diameter consisting of high angle grain boundaries. Also these ultrafine grains were relatively stable with little grain growth when annealed up to 600$^{\circ}C$ for 1hour.

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