Zobrazeno 1 - 10
of 63
pro vyhledávání: '"Changwook Ji"'
Publikováno v:
Journal of Materials Research and Technology, Vol 30, Iss , Pp 3916-3928 (2024)
Magnesium (Mg) alloys are the lightest structural metallic material, but it is hard to be applied to various industrial fields due to the crystallographic nature that is composed with hexagonal closed packed (HCP). Wire arc additive manufacturing (WA
Externí odkaz:
https://doaj.org/article/33c8c228272f4a30a7531d97a7f7bc32
Autor:
Hyun-Uk Jun, Jae-Deuk Kim, Jooyong Cheon, Jaehun Kim, Yeong-Do Park, Yang-Do Kim, Changwook Ji
Publikováno v:
Journal of Materials Research and Technology, Vol 28, Iss , Pp 844-855 (2024)
The microstructure and mechanical properties of adjustable-ring-mode (ARM) laser-welded, hot-stamped 22MnB5 steel joints were analyzed and compared with those of Al–Si coated 22MnB5. Al segregation into the fusion zone (FZ) was suppressed by a ring
Externí odkaz:
https://doaj.org/article/2bb14c91cf204db2a3d244f910709eee
Publikováno v:
Materials, Vol 17, Iss 18, p 4547 (2024)
In this study, microstructure, mechanical, and shape memory properties of the welded Fe-based shape memory alloy (Fe-SMA) plates with a nominal composition of Fe-17Mn-5Si-10Cr-4Ni-(V, C) (wt.%) by gas tungsten arc welding were investigated. The optim
Externí odkaz:
https://doaj.org/article/181974965d994d24b55e9dfced6f6979
Publikováno v:
Journal of Materials Research and Technology, Vol 25, Iss , Pp 6567-6577 (2023)
Magnesium (Mg) alloys have a low density among the structural metals, but it is hard to be plastically deformed due to their crystallographic nature. Wire arc additive manufacturing (WAAM) could be one of the alternative processes to fabricate the Mg
Externí odkaz:
https://doaj.org/article/f689521aaf174d27bf6df34b81ffac46
Autor:
Jae Won Kim, Sunusi Marwana Manladan, Kaisar Mahmud, Woosung Jin, Tejaswin Krishna, Changwook Ji, Dae-Geun Nam, Yeong-Do Park
Publikováno v:
Metals, Vol 13, Iss 11, p 1826 (2023)
In the automotive production line, a single pair of electrodes is employed to produce hundreds of consecutive welds before undergoing dressing or replacement. In consecutive resistance spot welding (RSW) involving Zn-coated steels, the electrodes und
Externí odkaz:
https://doaj.org/article/e3294bd1c20845c0be2a22664481b4fa
Publikováno v:
Metals, Vol 12, Iss 10, p 1722 (2022)
The mechanical properties of Ti-6Al-4V alloy are affected by its microstructures. However, the effects of these microstructures on the high cycle fatigue behavior of Ti-6Al-4V alloy with a mixed structure (α + β phases) remain unknown. In this stud
Externí odkaz:
https://doaj.org/article/dfc0a9508d9540ddbf03a41eae1ec359
Autor:
Jae-Deuk Kim, Siva Prasad Murugan, Seong-Woo Choi, Yutaka S. Sato, Jae-Keun Hong, Changwook Ji, Chang-Sub Kwak, Yeong-Do Park
Publikováno v:
Metals, Vol 12, Iss 8, p 1361 (2022)
The mechanical properties of commercially pure titanium can further be improved through the grain refinement processes; however, welding fine-grained materials is challenging due to the grain coarsening in the weld area and hence the weakening of the
Externí odkaz:
https://doaj.org/article/dfc0c780ce44410aaa8335a1cc50bf75
Publikováno v:
Applied Sciences, Vol 11, Iss 23, p 11572 (2021)
The A356 alloy has been widely used in automotive components, such as wheels and brake disks, because it is an excellent lightweight material with high corrosion resistance and good mechanical properties. Recently, to reduce the weight of brake disks
Externí odkaz:
https://doaj.org/article/cfeeea5e0a1c4c22bd7f18340203edc7
Autor:
Sungwook Kang, Wangho Yun, Hwanjin Kim, Jaewoong Kim, Changwook Ji, Kwangjin Lee, Jaehwang Kim, Hong-Lae Jang, Kwangsan Chun
Publikováno v:
Materials, Vol 14, Iss 22, p 6982 (2021)
As the environmental pollution issue has recently become significant, environmental regulations in Europe and the United States are being strengthened. Thus, there is a demand for the quality improvement of emission after-treatment systems to satisfy
Externí odkaz:
https://doaj.org/article/b436abc7c119435085e44b2c94af1dbd
Autor:
Yoon-Seok Lee, Shunnosuke Yamagishi, Masataka Tsuro, Changwook Ji, Seungchan Cho, Yangdo Kim, Moonhee Choi
Publikováno v:
Metals, Vol 11, Iss 11, p 1854 (2021)
The wear behavior of AISI304 stainless steel was investigated under dry, water-, and oil-lubricated conditions. A block-on-disk wear test was conducted in this work, since the test conditions could be controlled easily. For oil-lubricated contact, a
Externí odkaz:
https://doaj.org/article/7d7c621c120d47fa8d93308ced628d85