In-situ TiC particle-reinforced Hastelloy X superalloy fabricated by laser additive manufacturing
In-situ metal matrix composites are desirable for achieving optimum mechanical properties. This study investigated the enhancement of mechanical performance in Hastelloy X (HX) superalloy through in-situ synthesis of TiC and γ′ phases via titanium (Ti) addition using a high-throughput laser additive...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-05-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425006714 |
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| Summary: | In-situ metal matrix composites are desirable for achieving optimum mechanical properties. This study investigated the enhancement of mechanical performance in Hastelloy X (HX) superalloy through in-situ synthesis of TiC and γ′ phases via titanium (Ti) addition using a high-throughput laser additive manufacturing system. The influence of Ti content on phase evolution, microstructure, and mechanical properties was comprehensively analyzed for both the as-deposited and heat-treated HX superalloys. The results revealed that increasing Ti content exacerbated micro-segregation during the deposition, promoting pronounced dendritic growth and a higher σ phase volume fraction. These microstructural changes enhanced tensile strength while concurrently elevated cracking susceptibility, with macroscopic cracking detected upon reaching 5 wt% Ti. Following heat treatment, micro-segregation was significantly reduced. In alloys containing 2–4 wt% Ti, TiC and nano-sized γ′ phases precipitated after heat treatment, leading to a 40 % improvement in yield strength and tensile strength compared to the baseline HX superalloy, while maintaining an elongation of approximately 30 %. |
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| ISSN: | 2238-7854 |