Journal
JOURNAL OF MANUFACTURING PROCESSES
Volume 54, Issue -, Pages 148-157Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jmapro.2020.03.010
Keywords
Anisotropy; Ultimate tensile strength; Grain refinement; Ultrasonic peening treatment in three directions; Ultrasonic peening treatment; Cold metal transfer; Additive manufacturing; Ti-6Al-4V
Categories
Funding
- National Natural Science Foundation of China [51575381]
- Tianjin Research Program of Application Foundation and Advanced Technology [15JCZDJC38600]
- Natural Science Foundation of Tianjin [16JCQNJC04300]
- China Scholarship Council [201906250178]
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In the cold metal transfer additive manufacturing process of Ti-6Al-4V thin wall structure, ultrasonic peening treatment (UPT) in three directions is proposed to refine the large columnar prior-beta grains and secondary alpha grains, and to improve anisotropy in tensile properties. The experimental results showed that UPT in three directions applied to each weld right after arc extinguishing has a minor influence on the surface appearance, which shows no apparent plastic deformation, but has a great improvement in grain refinement. The changes in microstructure and dislocations of thin wall structure treated by UPT in three directions were observed. By comparing with those without UPT, the main causes for refinement of columnar prior-beta and secondary alpha grains was explored, namely mechanical effects of ultrasonic at the temperature range of alpha' dissolution temperature T-diss - liquidus temperature T-l. Specimens with UPT have better properties, higher loads with the same indentation displacement in nano-indentation tests, an increase in ultimate tensile strength and a reduction in anisotropic percentage in tensile tests.
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