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논문 기본 정보

자료유형
학술대회자료
저자정보
김성수 (한국원자력연구원) 정종엽 (한국원자력연구원)
저널정보
대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2024년 학술대회
발행연도
2024.11
수록면
1,511 - 1,515 (5page)

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초록· 키워드

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In the process of manufacturing parts, the heat or deformation applied by thermal and mechanical treatment is not completely released and is remained. The remaining heat is due to a lattice strain or changes in atomic arrangement. This heat is confirmed by thermal analysis (differential scanning calorimeter, DSC). The heat remaining in the deformed material has been called stored energy earlier. The term stored energy is given because it is not known how heat remains in the material. The heat of fusion or solidification that flows in and out during the phase transformation process can be stored, so its essence is entropy. This is because the heat that flows in and out during the solidification or melting process is essentially a phenomenon that causes changes in atomic arrangement. This storage or accumulation of heat related to changes in atomic arrangement also occurs in solids. In other words, stored energy is a misunderstanding of residual entropy. The atoms of materials that are deformed by cold working or rapidly cooled from high temperature remain in an excited state. The fact that the atomic arrangement is disturbed by deformation or rapid cooling treatment is itself an increase in entropy. The amount of heat measured by thermal analysis is converted into entropy by the second law of thermodynamics (S=Q/T). This increase in entropy leaves the atomic arrangement in an excited state, so when the entropy inside the material increases, the volume (=length3) of the material increases and expands three-dimensionally. The heat remaining inside the material due to this thermal mechanical treatment expands the lattice distance, and when the lattice distance is measured, it is observed as tensile strain. Various phenomena that occur in structural materials due to residual entropy are very similar to residual stress. The difference is that residual entropy can well explain the exothermic reaction that occurs in materials where residual stress is expected to remain, whereas residual stress cannot explain the exothermic reaction. Various phenomena caused by changes in the atomic arrangement due to deformation or rapid cooling rate in structural materials can be explained by residual entropy.

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Abstract
1. 서론
2. 실험
3. 결과 및 논의
4. 결론
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