Journal
METALS
Volume 7, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/met7090367
Keywords
superalloy; surface contamination; prior particle boundary; hot isostatic pressing; selective laser melting
Funding
- ALCA Program of the Japan Science and Technology Agency, JST
- Japan Society for the Promotion of Science [16K06799]
- Grants-in-Aid for Scientific Research [16K06799] Funding Source: KAKEN
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The aim of this study was to gain a deep understanding of the microstructure-mechanical relationship between solid-state sintering and full-melting processes. The IN718 superalloy was fabricated by hot isostatic pressing (HIP) and selective laser melting (SLM). Continuous precipitates were clearly localized along the prior particle boundary (PPB) in the HIP materials, while SLM materials showed a microstructure free of PPB. The mechanical properties of specimens that underwent SLM + solution treatment and aging were comparable to those of conventional wrought specimens both at room temperature and 650 degrees C. However, a drop was observed in the ductility of HIP material at 650 degrees C. The brittle particles along the PPB were found to affect the HIP materials' creep life and ductility during solid-state sintering.
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