Selective Laser Melting 방식으로 적층제조된 Inconel 718 합금의 조사 경화 특성

서지정보

ㆍ발행기관 : 한국분말야금학회 ㆍ수록지정보 : 한국분말야금학회지 / 30권 / 5호
ㆍ저자명 : 서주원, 임상엽, 진형하, 천영범, 강석훈, 한흥남

목차

1. Introduction
2. Experimental
2.1. 사용 재료 및 적층 제조 공정 변수
2.2. 이온 조사 실험 조건 및 미세조직 평가 방법
2.3. 나노압입시험
3. Results and Discussion
3.1. 이온 조사로 인한 경도 변화 나노압입시험 결과
3.2. 이온 조사 후 미세조직 분석 결과
4. Conclusion
Acknowledgement

영어 초록

An irradiation hardening of Inconel 718 produced by selective laser melting (SLM) was studied based on the microstructural observation and mechanical behavior. Ion irradiation for emulating neutron irradiation has been proposed owing to advantages such as low radiation emission and short experimental periods. To prevent softening caused by the dissolution of ' and '' precipitates due to irradiation, only solution annealing (SA) was performed. SLM SA Inconel 718 specimen was ion irradiated to demonstrate the difference in microstructure and mechanical properties between the irradiated and non-irradiated specimens. After exposing specimens to Fe3+ ions irradiation up to 100 dpa (displacement per atom) at an ambient temperature, the hardness of irradiated specimens was measured by nanoindentation as a function of depth. The depth distribution profile of Fe3+ and dpa were calculated by the Monte Carlo SRIM (Stopping and Range of Ions in Matter)-2013 code under the assumption of the displacement threshold energy of 40 eV. A transmission electron microscope was utilized to observe the formation of irradiation defects such as dislocation loops. This study reveals that the Frank partial dislocation loops induce irradiation hardening of SLM SA Inconel 718 specimens.

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