Výsledky vyhledávání - "Kyung Keun Um"

Effects of local-brittle-zone (LBZ) microstructures on crack initiation and propagation in three Mo-added high-strength low-alloy (HSLA) steels

Autor: Seok Gyu Lee, Woo Gyeom Kim, Sunghak Lee, Bohee Kim, Kyung Keun Um, Seok Su Sohn

Publikováno v: Materials Science and Engineering: A. 760:125-133

Fracture toughness of intercritically-reheated coarse-grained HAZ (ICRCGHAZ), i.e., local brittle zone, is severely reduced at low temperatures by the presence of undesirable microstructural features such as coarsened prior austenite grains, bainitic

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::778df8441c3684b8b409036c63f38b72
https://doi.org/10.1016/j.msea.2019.05.120

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Effects of martensite-austenite constituent on crack initiation and propagation in inter-critical heat-affected zone of high-strength low-alloy (HSLA) steel

Autor: Seok Su Sohn, Woo Gyeom Kim, Kyung Keun Um, Sunghak Lee, Bohee Kim, Seok Gyu Lee

Publikováno v: Materials Science and Engineering: A. 715:332-339

Crack susceptibility of martensite-austenite constituent (MA) in inter-critical heat-affected zone (ICHAZ) is varied with properties of adjacent matrix, hardness of MA, and MA/matrix interfacial characteristics, but reasons why MAs are voided at MA/m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5c1b9282ad315318b3560a95907d2916
https://doi.org/10.1016/j.msea.2018.01.021

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Effects of Ni and Mn addition on critical crack tip opening displacement (CTOD) of weld-simulated heat-affected zones of three high-strength low-alloy (HSLA) steels

Autor: Seok Su Sohn, Seok Gyu Lee, Dong Ho Lee, Kyung Keun Um, Sunghak Lee, Woo Gyeom Kim, Ki Seok Kim

Publikováno v: Materials Science and Engineering: A. 697:55-65

In order to understand and improve fracture toughness of heat affected zones (HAZs) of high-strength low alloy (HSLA) steels, complex microstructures including quasi-polygonal ferrite (QPF), acicular ferrite (AF), granular bainite (GB), bainitic ferr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0b49349ecb569abcd9ff52d08ffd5d2d
https://doi.org/10.1016/j.msea.2017.04.115

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Effects of Mo addition on crack tip opening displacement (CTOD) in heat affected zones (HAZs) of high-strength low-alloy (HSLA) steels

Autor: Seok Gyu Lee, Bohee Kim, Kyung-Keun Um, Woo Gyeom Kim, Sunghak Lee

Publikováno v: Scientific Reports, Vol 9, Iss 1, Pp 1-12 (2019)
Scientific Reports

Effects of Mo addition on microstructures and crack tip opening displacement (CTOD) in heat affected zones (HAZs) of three high-strength low-alloy (HSLA) steels were investigated in this study, and the correlation between them was explained by fractu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::864e07b1117dcf880f6e62e14fc9154b
https://doi.org/10.1038/s41598-018-36782-6

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Effect of deformation induced transformation of ɛ-martensite on ductility enhancement in a Fe-12 Mn steel at cryogenic temperatures

Autor: Joong Eun Jung, Jong Bae Jeon, Young Won Chang, Jung-Su Kim, Kyung-Keun Um

Publikováno v: Metals and Materials International. 20:41-47

Metastable ɛ-martensite (ɛ-Ms) formed during a prior heat treatment of Fe-12Mn steel has been reported to transform into α-Ms during subsequent inelastic deformation. This deformation induced phase transformation (DIPT) from ɛ-Ms to α-Ms has bee

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::828463c9b0d327435356e0f8b2accdb2
https://doi.org/10.1007/s12540-014-1010-4

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Small-scale mechanical property characterization of ferrite formed during deformation of super-cooled austenite by nanoindentation

Autor: Heung Nam Han, Dohyun Kim, Kyung-Keun Um, Kyu Hwan Oh, Miyoung Kim, Tae-Hong Ahn, Jong-Kyo Choi

Publikováno v: Materials Science and Engineering: A. 523:173-177

The mechanical properties of dynamically and statically transformed ferrites were analyzed using a nanoindentater-EBSD (Electron BackScattered Diffraction) correlation technique, which can distinguish indenting positions according to the grains in th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::47030ec179ca4d0e89a8629070a06545
https://doi.org/10.1016/j.msea.2009.05.050

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Ferrite Transformation during Deformation of Super-cooled Austenite

Autor: Hu-Chul Lee, Kyung-Keun Um

Publikováno v: ISIJ International. 48:1050-1055

The research results achieved by the Korean national project, HIPERS-21, on the ferrite transformation during the deformation of super-cooled low carbon austenite were summarized. Fine ferrite grains formed during the deformation of austenite, i.e. d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2417894f4f568e30a850d0c89c8bbe4d
https://doi.org/10.2355/isijinternational.48.1050

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Formation of Ultrafine Ferrite by Strain-induced Dynamic Transformation in Plain Low Carbon Steel

Autor: Dong-Han Seo, Wung-Yong Choo, Kyung-Keun Um, Jae Sang Lee, Jong-Kyo Choi

Publikováno v: ISIJ International. 43:746-754

Strain-induced dynamic transformation (SIDT) is of great advantage to obtaining ultrafine-grained ferrite in low carbon steels partly by early impingement of ferrite nuclei which are very rapidly and concurrently formed due to the deformation and par

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7b13733e38f1fc08368ba6ba55c60888
https://doi.org/10.2355/isijinternational.43.746

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