밀어닐링 온도가 Ti-6Al-4V 합금의 미세조직 및 경도에 미치는 영향

서성지; 권기훈; 최호준; 이기영; 정민수

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자료유형: 학술저널

저자정보: 서성지 (한국생산기술연구원 열처리그룹) 권기훈 (한국생산기술연구원 열처리그룹) 최호준 (한국생산기술연구원 성형기술그룹) 이기영 ([주]케이피씨엠) 정민수 (한국생산기술연구원 열처리그룹)

저널정보: 한국열처리공학회 열처리공학회지 열처리공학회지 제32권 제6호

발행연도: 2019.1

수록면: 263 - 269 (7page)

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The mechanism of microstructure and hardness changes during mill annealing of Ti-6Al-4V alloy was investigated. The annealing heat treatments were performed at $675{\sim}795^{\circ}C$ in vacuum for 2 hours, followed by air cooling. The microstructure was observed by using an optical microscope and X-ray diffraction, and hardness was measured by using a Rockwell hardness tester and micro Vickers hardness tester. The average grain size becomes smaller at $675^{\circ}C$ to $735^{\circ}C$ due to the formation of new grains rather than grain growth, but becomes larger at $735^{\circ}C$ to $795^{\circ}C$ due to growth of the already-formed grains rather than formation of new grains. The mill annealing temperature becomes higher, the ${\beta}$ phase fraction decreases and ${\alpha}$ phase fraction increases at room temperature. This is because the higher annealing temperature, the smaller amount of V present in the ${\beta}$ phase, and thus the ${\beta}$ to ${\alpha}$ transformation occurs more easily when cooled to room temperature. As the mill annealing temperature increases, the hardness value tends to decrease, mainly due to resolution of defects such as dislocations from $675^{\circ}C$ to $735^{\circ}C$ and due to grain growth from $735^{\circ}C$ to $795^{\circ}C$, respectively.

#Ti-6Al-4V #Mill annealing #Hardness #Microstructure #Phase fraction #Grain size

참고문헌 (14)

참고문헌 신청

S. Tanaka / 2013 / ICF 13

T. Morita / 2005 / Materials transactions 46:1681

I. Inagaki / 2014 / Nippon steel & sumitomo metal technical report 106:22

Y. Ren / 2018 / Influence of primary α-phase volume fraction on the mechanical properties of Ti-6Al-4V alloy at different strain rates and temperatures / IOP Conference Series : Materials Science and Engineering 322(2):022022

박상후 / 2018 / 미세조직적 인자가 밀소둔된 Ti-6Al-4V 합금의피로 및 피로균열전파 거동에 미치는 영향 / 대한금속·재료학회지 56(12):845~853

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