Optimizing the comprehensive properties of PBF-LB/M Ti6Al4V alloy in nitric acid by heat treatment
Abstract Titanium (Ti) alloys fabricated by laser powder bed fusion (PBF-LB/M) exhibit substantial potential for industrial applications due to their good formability and cost-effectiveness. However, the poor matching between strength, plasticity, and corrosion resistance properties in as-fabricated...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-05-01
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| Series: | npj Materials Degradation |
| Online Access: | https://doi.org/10.1038/s41529-025-00587-6 |
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| Summary: | Abstract Titanium (Ti) alloys fabricated by laser powder bed fusion (PBF-LB/M) exhibit substantial potential for industrial applications due to their good formability and cost-effectiveness. However, the poor matching between strength, plasticity, and corrosion resistance properties in as-fabricated PBF-LB/M Ti-alloys hinders their broader application. Herein, the effect of heat treatment on the comprehensive properties of PBF-LB/M Ti6Al4V alloy was investigated. Results revealed that hot isostatic pressing (HIP) and annealing treatment (AT) facilitate the transformation of acicular αʹ-Ti phase to α + β phase, leading to a shift in the fracture mechanism from brittle to ductile behaviour, thereby improving the strength-plasticity balance. Moreover, HIP effectively reduced internal defects and promoted the formation of a denser, more robust passive film in nitric acid, compared to PBF-LB/M alloy after AT. This enhanced passive film imparts superior corrosion resistance, thus achieving a favourable compromise between strength, plasticity, and corrosion resistance in PBF-LB/M Ti6Al4V alloy. |
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| ISSN: | 2397-2106 |