Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 860, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.144255
Keywords
Wire arc additive manufacturing; Titanium alloy; Annealing; Microstructure; Charpy impact toughness; Deformation twin
Categories
Funding
- National Key Research and Devel-opment Project of the P. R. China
- [2018YFB1105803]
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The microstructure, tensile properties, and impact toughness of wire arc additive manufactured (WAAMed) titanium alloy were investigated. The results showed that by using a newly developed deformation twinning induced plasticity alloy and annealing treatment, titanium alloy with excellent toughness can be obtained.
The microstructure of wire arc additive manufactured (WAAMed) titanium alloy was characterized by brittle martensitic, which was significantly different from that of wrought alloy. It was generally believed that brittle martensitic was detrimental to the toughness of titanium alloys. In order to obtain WAAMed titanium alloy with excellent combination of strength and toughness, Ti5111 alloy, which is a newly developed deformation twin-ning induced plasticity(TWIP) alloy with an excellent combination of impact toughness and strength, was pre-pared by arc additive manufacturing(WAAM) technology and then annealed at 900 degrees C + air cooling(AC) and 950 degrees C+ air cooling. Microstructure, tensile properties and impact toughness of WAAMed Ti5111 alloy were investigated. Electron backscatter diffraction (EBSD) observation was adopted to identify the deformation twins activated in impact samples. Results showed that as-built WAAMed Ti5111 with excellent toughness was ob-tained, which was 42.8% higher than that of WAAMed Ti-6Al-4V alloy. After annealing, more deformation twins and secondary twins were activated during impact loading, which could effectively improve the toughness of WAAMed Ti5111.
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