Optimizing the comprehensive properties of PBF-LB/M Ti6Al4V alloy in nitric acid by heat treatment
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.
Authors
- H.B. Ji
- L. M. Zhang
- A. L. (ORCID: https://orcid.org/0000-0002-0335-5320)
- Zhifu Liu (ORCID: https://orcid.org/0000-0001-9087-1114)
- D.C. Ren (ORCID: https://orcid.org/0000-0002-4268-8910)
- Yong Zheng (ORCID: https://orcid.org/0000-0002-6516-2188)
Institutions
- University of Science and Technology of China (CN)
- Chinese Academy of Sciences (CN)
- Institute of Metal Research (CN)
Publication Details
- Journal
- npj Materials Degradation
- Published
- 2025-05-03
- DOI
- https://doi.org/10.1038/s41529-025-00587-6
- Citations
- 3
- Primary Topic
- Additive Manufacturing Materials and Processes
- Type
- article
- Field-Weighted Citation Impact
- 2.14
Funders
- National Natural Science Foundation of China
- China National Nuclear Corporation