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순수 타이타늄의 기계적 특성에 미치는 마찰 교반 용접 공정 조건의 영향
이용재 ( Y. J. Lee ),최안드레 ( A. Choi ),이승준 ( S. J. Lee ),( Hidetoshi Fujii ),신세은 ( S. E. Shin ),이동근 ( D. G. Lee ) 한국열처리공학회 2019 熱處理工學會誌 Vol.32 No.3
Friction stir welding is one of the interesting welding methods for titanium and its alloy which proceeds with plastic flow due to thermo-mechanical stirring and friction heat. Solid-state welding can solve severe problems such as high-temperature oxidation, interstitial oxygen diffusion and grain coarsening by liquid-state welding. Dynamic recrystallization and grain refinement can vary significantly with the plunging load and rotational speed of tool during friction stir welding, and suitable process conditions must be optimized to obtain microstructure and better mechanical characteristics. Suitable FSW conditions were 1000 kg of plunging load and 200 rpm of rotational speed and it showed YS 270 MPa, UTS 332.1 MPa, and El 17.3%, which were very similar to those of wrought titanium sheet. (Received May 10, 2019; Revised May 17, 2019; Accepted May 24, 2019)