Microstructure of intercritical heat affected zone and toughness of microalloyed steel laser welds; Materials Science and Engineering: A; Vol. 770

Microstructure of intercritical heat affected zone and toughness of microalloyed steel laser welds; Materials Science and Engineering: A; Vol. 770

Dettagli Bibliografici
Parent link:Materials Science and Engineering: A
Vol. 770.— 2020.— [138522, 10 p.]
Ente Autore: Национальный исследовательский Томский политехнический университет Инженерная школа новых производственных технологий Отделение материаловедения
Altri autori: Derevyagina L. S. Lyudmila Sergeevna, Gordienko A. I. Antonina Ildarovna, Orishich A. M. Anatoliy, Malikov A. G., Surikova N. S. Natalya, Volochaev M. N. Mikhail
Riassunto:Title screen
Microstructure of laser welds of the X70 low-carbon pipe steel was studied. High cooling rates after laser welding and non-uniform distribution of carbon in the ferrite-pearlite base metal caused formation of regions with increased microhardness (up to 650 НV) in inter-critical heat affected zone (ICHAZ). These regions consisted of finely dispersed degenerate upper bainite and martensite-austenite constituents of a slender shape and small fraction of a massive shape along the boundaries of bainite laths, as well as twinned martensite. High concentration of martensite-austenite constituents (10–16%) and residual stresses in ICHAZ, as well as a dendritic martensitic structure with carbide interlayers along the boundaries of martensite laths in fusion zone were the main reasons of sharp decrease in charpy impact energy of the welded samples. High microhardness of the laser welds was decreased down to 320 HV and their brittleness was improved by annealing. Also, in ICHAZ, degenerate upper bainite and the regions of martensite-austenite constituents decayed forming tempered sorbite and Fe2C and Fe3C carbides, respectively. Charpy impact energy of the welds doubled after annealing compared to the welds without annealing, and ductile-brittle transition temperature decreased down to –60°С.
Режим доступа: по договору с организацией-держателем ресурса
Lingua:inglese
Pubblicazione: 2020
Soggetti:
электронный ресурс
труды учёных ТПУ
low-carbon steel
laser welding
heat affected zone
structure
toughness
низкоуглеродистые стали
лазерная сварка
термическое воздействие
Accesso online:https://doi.org/10.1016/j.msea.2019.138522
Natura: Elettronico Capitolo di libro
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=664841

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