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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 고영건
- 발행연도
- 2021
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This study aimed at investigating the effects of sintering conditions on
microstructure evolution and tensile properties of Ti-6Al-4V alloy
processed by metal injection molding (MIM). For this purpose, a series
of MIM was performed to fabricate Ti-6Al-4V alloy samples using a
conjugation of sintering steps performed in the range 1173 ? 1373 K for
3h, 1173 ? 1423 K for 6 h, and a post-heat treatment at 1173 K for 3h,
followed by furnace cooling. Microstructural observations by scanning
electron microscopy and electron backscatter diffraction showed that the
heat treatments proposed in the present study was responsible for the
changes in the alpha-beta microstructures and porosity of the matrix.
After the initial heat treatment, this study showed that the porosity was
reduced evidently and equiaxed alpha grains were converted to beta
phase exhibiting lamella structure. Further heat treatments were found
to decrease the porosity slightly while promoting the appearance of
equiaxed alpha grains, where a notable amount of beta phase would be
retained. Therefore, a simultaneous improvement of strength and
ductility was achieved due to a decrease in porosity as well as
microstructural transformations. The improvement of strength was
attributed to the presence of beta lamellae boundary while ductility
would be compensated by equiaxed alpha grains. Such mechanical
behavior would be explained in relation to the microstructure evolution
of the Ti-6Al-4V sample via MIM.
microstructure evolution and tensile properties of Ti-6Al-4V alloy
processed by metal injection molding (MIM). For this purpose, a series
of MIM was performed to fabricate Ti-6Al-4V alloy samples using a
conjugation of sintering steps performed in the range 1173 ? 1373 K for
3h, 1173 ? 1423 K for 6 h, and a post-heat treatment at 1173 K for 3h,
followed by furnace cooling. Microstructural observations by scanning
electron microscopy and electron backscatter diffraction showed that the
heat treatments proposed in the present study was responsible for the
changes in the alpha-beta microstructures and porosity of the matrix.
After the initial heat treatment, this study showed that the porosity was
reduced evidently and equiaxed alpha grains were converted to beta
phase exhibiting lamella structure. Further heat treatments were found
to decrease the porosity slightly while promoting the appearance of
equiaxed alpha grains, where a notable amount of beta phase would be
retained. Therefore, a simultaneous improvement of strength and
ductility was achieved due to a decrease in porosity as well as
microstructural transformations. The improvement of strength was
attributed to the presence of beta lamellae boundary while ductility
would be compensated by equiaxed alpha grains. Such mechanical
behavior would be explained in relation to the microstructure evolution
of the Ti-6Al-4V sample via MIM.
목차
제 1장. 서론 11.1.연구배경 11.2. 연구동향 21.3. 참고문헌 4제 2장. 이론적배경 52.1. Ti-6Al-4V 합금 52.1.1. Ti-6Al-4V 합금 개요 52.1.2. 타이타늄 합금의 미세조직 및 특성 72.2. 금속분말사출성형(metal injection molding, MIM) 102.2.1. 금속분말사출성형 개요 102.2.2. 금속분말사출성형 공정 및 특성 122.2.3. 소결분위기 및 온도 142.3. 참고문헌 16제 3장. 연구방법 173.1. 소결분위기 제어 173.1.1. 대기 분위기 173.1.2. 아르곤가스 분위기 173.1.3. 고진공 분위기 183.1.4. 고진공과 TiH2 분위기 193.2. 소결온도 및 시간 제어 193.2.1. 미세기공 감소를 위한 소결공정 193.2.2. 미세조직형태변화를 위한 소결공정 213.3. 참고문헌 22제 4장. 연구결과 234.1. 소결분위기 제어 234.1.1. 불순물 정량분석 결과 234.2. 소결온도 및 시간 제어 294.2.1. 소결온도 및 시간에 따른 미세기공 감소 효과 영향 294.2.2. 미세기공 감소 효과에 따른 기계적물성평가 364.2.3. 후-열처리 과정을 통한 미세조직 유도 영향 424.2.4. 미세조직형태 변화에 따른 기계적물성평가 49제 5장. 연구결론 545.1. 결론 54제 6장. 향후 연구방향 556.1. 소결시간변수를 제어하여 완전한 등축조직 유도 556.2. 참고문헌 57
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