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Drawing Process Design and Mechanical Properties Control for High Strengthening of CP Titanium

순수 타이타늄 고강도화를 위한 인발공정설계 및 기계적 특성 제어 기술

  • Choi, Seong Woo (Titanium Department, Korea Institute of Materials Science) ;
  • Park, Chan Hee (Titanium Department, Korea Institute of Materials Science) ;
  • Lee, Sang Won (Titanium Department, Korea Institute of Materials Science) ;
  • Yeom, Jong Taek (Titanium Department, Korea Institute of Materials Science) ;
  • Hong, Jae Keun (Titanium Department, Korea Institute of Materials Science)
  • 최성우 (재료연구소 타이타늄연구실) ;
  • 박찬희 (재료연구소 타이타늄연구실) ;
  • 이상원 (재료연구소 타이타늄연구실) ;
  • 염종택 (재료연구소 타이타늄연구실) ;
  • 홍재근 (재료연구소 타이타늄연구실)
  • Received : 2016.11.23
  • Accepted : 2016.12.29
  • Published : 2017.02.01

Abstract

CP (Commercially Pure) titanium has been widely used in various industries such as in energy plants and bio-materials because of an excellent corrosion resistance and its non-toxicity to the human body. But there are limitations for usage as structural materials due to low strength. The tensile properties of CP titanium could be improved by microstructure refinement such as in a SPD (Severe Plastic Deformation) process. However, high strengthening of CP titanium wire is impossible by SPD processes like ECAP (Equal Channel Angular Pressing), HPT (High-Pressure Torsion), and the ARB (Accumulative Roll Bonding) process. The study purposes are to increase the strength of CP titanium wire by optimization of the cold drawing process and the harmonization with mechanical properties by heat treatments for the next forming process. The optimization process was investigated with regard to the design of drawing dies and the reduction ratio of cross sections. The elongations of high strength CP titanium were controlled by heat treatment.

Keywords

Acknowledgement

Supported by : 산업통상자원부, 방위사업청

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