금속고화체용 STS304-Zr 합금의 미세조직과 파괴거동에 미치는 열처리의 영향

서지정보

ㆍ발행기관 : 한국재료학회 ㆍ수록지정보 : 한국재료학회지 / 28권 / 3호
ㆍ저자명 : 김종우, 장선아, 한승엽, 박환서, 이정훈, 이성학, 권용재, 이정구, 신상용

목차

1. 서 론
2. 실험 방법
2.1 합금 제조
2.2 미세조직 분석
2.3 파괴 거동 분석
3. 결과 및 고찰
3.1 STS304-Zr 합금의 미세조직과 파괴거동
3.2 열처리 후 미세조직과 파괴거동의 변화
4. 결 론
References

영어 초록

Three kinds of STS304-Zr alloys were fabricated by varying the Zr content, and their microstructure and fracture properties were analyzed. Moreover, we performed heat treatment to improve their properties and studied their microstructure and fracture properties. The microstructure of the STS304-Zr alloys before and after the heat treatment process consisted of α-Fe and intermetallics: Zr(Cr, Ni, Fe)2 and Zr6Fe23. The volume fraction of the intermetallics increased with an increasing Zr content. The 11Zr specimen exhibited the lowest hardness and fine dimples and cleavage facets in a fractured surface. The 15Zr specimen had high hardness and fine cleavage facets. The 19Zr specimen had the highest hardness and large cleavage facets. After the heat treatment process, the intermetallics were spheroidized and their volume fraction increased. In addition, the specimens after the heat treatment process, the Laves phase (Zr(Cr, Ni, Fe) 2) decreased, the Zr6Fe23 phase increased and the Ni concentration in the intermetallics decreased. The hardness of all the specimens after the heat treatment process decreased because of the dislocations and residual stresses in α-Fe, and the fine lamellar shaped eutectic microstructures changed into large α-Fe and spheroidized intermetallics. The cleavage facet size increased because of the decomposition of the fine lamellarshaped eutectic microstructures and the increase in spheroidized intermetallics.

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