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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 발행연도
- 2020
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Effect of multi-pass reduction for cold drawing on the microstructural evolution and subsequent mechanical properties of a non-equiatomic Co10Cr15Fe25Mn10Ni30V10(atomic %) high-entropy alloy (HEA) wire was investigated. After cutting from a Y-block ingot, HEA rods were caliber rolled, annealed, and then produced into wires with of varying diameters by cold drawing at room temperature. As reduction ratio increased, the center of the cross section exhibited a duplex major <111> and minor <100> deformation textures. On the other hands, the surface formed <111>-<100> deformation texture band according to the orientation rotation caused by the shear deformation. The maximum reduction ratio of 96% was successfully applied to obtain 1-mm diameter wire without
fracture. This resulted in a maximum tensile strength of 1.6 GPa. Both electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) examination revealed that nano-scale ultrafine grains and deformation twins were generated by the multi-step drawing process. As the reduction ratio increased, not grain refinement but nano-twinning became dominant mechanisms required for achieving high-strength in the Co10Cr15Fe25Mn10Ni30V10 HEA wires. Also, the distribution of strain in the cold drawn HEA wire was analysed using the finite element analysis method (FEM) based on the same conditions as the multi-step cold drawing. As a result of the FEM, the HEA wires had different strain in the radial direction. The author attempted to elucidate the effect of
strain distribution on hardness, and further on nano-grained area and deformation twins.
fracture. This resulted in a maximum tensile strength of 1.6 GPa. Both electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) examination revealed that nano-scale ultrafine grains and deformation twins were generated by the multi-step drawing process. As the reduction ratio increased, not grain refinement but nano-twinning became dominant mechanisms required for achieving high-strength in the Co10Cr15Fe25Mn10Ni30V10 HEA wires. Also, the distribution of strain in the cold drawn HEA wire was analysed using the finite element analysis method (FEM) based on the same conditions as the multi-step cold drawing. As a result of the FEM, the HEA wires had different strain in the radial direction. The author attempted to elucidate the effect of
strain distribution on hardness, and further on nano-grained area and deformation twins.
목차
Ⅰ. 서 론 1Ⅱ. 이론적 배경 51. 고엔트로피 합금 52. 인발 공정 113. 고엔트로피 합금 인발 공정 적용 사례 및 시사점 12Ⅲ. 실험 방법 281. 합금 선택 282. 시편 준비 293. 단면 감소율에 따른 미세조직 변화 분석 304. 단면 감소율에 따른 기계적 특성 변화 분석 315. 유한요소해석 32Ⅳ. 결과 및 고찰 411. 단면 감소율에 따른 미세조직 변화 412. 단면 감소율에 따른 기계적 특성 변화 433. 유한요소해석 결과 444. 강화기구 규명 45Ⅴ. 결 론 60Ⅵ. Acknowledgements 62Ⅶ. 참고문헌 63
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