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Improving Mechanical Properties of Wire Arc Additively Manufactured Ti-6Al-4V Alloy by Ultrasonic Needle Peening Treatment

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Abstract
Wire arc additive manufacturing (WAAM) is being considered as a technology to replace the conventional manufacturing process of titanium alloys. However, coarse β grains, which can extend through several deposited materials, result in strong textures and anisotropy. As a solution, we study the plastic deformation effects of ultrasonic needle peening (UNP) on the microstructure. UNP treated materials deform plastically and the dislocation density increases. Fine α+α' grains with low aspect ratio are observed in the UNP treated specimens. UNP treated WAAM Ti-6Al-4V alloys have higher strength and lower elongation than those characteristics of WAAM Ti-6Al-4V alloys. Due to UNP treatment, the z-axis directional specimens exhibit a greater effect of reducing elongation than do the x-axis directional specimens. The UNP treatment produces fine grains
in proportion to the number of times UNP is performed, thereby increasing strength. UNP processes produce a large number of dislocations in the WAAM Ti-6Al-4V alloys, with the most dislocations being formed at the surface.
Author(s)
Hui-Jun YiJin-Woo KimYoung-Lak Kim신상용
Issued Date
2021
Type
Article
Keyword
wire arc additive manufacturingTi-6Al-4V alloyultrasonic needle peeningmicrostructuretensile test
DOI
10.3740/MRSK.2021.31.5.245
URI
https://oak.ulsan.ac.kr/handle/2021.oak/8975
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_nrf_kci_oai_kci_go_kr_ARTI_9793757&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Improving%20Mechanical%20Properties%20of%20Wire%20Arc%20Additively%20Manufactured%20Ti-6Al-4V%20Alloy%20by%20Ultrasonic%20Needle%20Peening%20Treatment&offset=0&pcAvailability=true
Publisher
Korean Journal of Materials Research
Location
대한민국
Language
영어
ISSN
1225-0562
Citation Volume
31
Citation Number
5
Citation Start Page
245
Citation End Page
254
Appears in Collections:
Engineering > Material Engineering
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