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논문 기본 정보

자료유형
학술저널
저자정보
Seong Ho Lee (Pusan National University) Jinyeong Yu (Pusan National University) Seho Cheon (Pusan National University) Jung Gi Kim (Gyeongsang National University) Taekyung Lee (Pusan National University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.30 No.4
발행연도
2024.4
수록면
886 - 894 (9page)
DOI
10.1007/s12540-023-01544-1

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초록· 키워드

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A post-heat treatment is necessary to finely adjust the desired microstructure and mechanical properties of Ti alloys producedby additive manufacturing. This research offers a comprehensive study of how electropulsing treatment (EPT) changes themicrostructure and microhardness of Ti–6Al–4V alloy fabricated by selective laser melting. It verifies the potential benefitsof using EPT instead of the conventional furnace heat treatment (FHT). The microstructural evolution was interpreted basedon the number and magnitude of electropulses, which were then compared with FHT samples treated at the same temperaturesand durations. Notably, the harmful columnar microstructure completely disappeared though the application of multipleelectropulses at a current density of 20 A mm−2. Such a result was not attained by the FHT counterpart using the same peaktemperature (1319 K) and duration (23 min). Furthermore, the EPT specimen exhibited a significant β-grain refinement. Theaccelerated atomic diffusion flux, one of athermal effects of EPT, resulted in the fast transformation of columnar microstructureinto fine and equiaxed prior-β grains. The microhardness was affected by both lath thickness and phase constituents inthe as-built alloy, whereas it was only governed by the former after the post-heat treatments. Utilizing EPT as an alternativepost-heat treatment can effectively alleviate the microstructural inhomogeneity of additively manufactured metals.

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