Effect of Age Hardening on Phase Composition and Microhardness of V-Free and V-Alloyed High-Nitrogen Austenitic Steels

Effect of Age Hardening on Phase Composition and Microhardness of V-Free and V-Alloyed High-Nitrogen Austenitic Steels

Dettagli Bibliografici
Parent link:AIP Conference Proceedings
Vol. 2051 : Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2018 (AMHS’18).— 2018.— [020183, 5 p.]
Ente Autore: Национальный исследовательский Томский политехнический университет (ТПУ)
Altri autori: Maier G. Galina, Astafurova E. Elena, Moskvina V. Valentina, Melnikov E. Eugene, Astafurov S. Sergey, Tumbusova I. Irina, Fortuna A. Anastasia, Panchenko M. Marina, Mironov Yu. Yuri, Mirovoy Yu. Yuri, Galchenko N. Nina
Riassunto:Title screen
Effect of age hardening regime (at the temperatures of 700 and 800°C for 10 min to 10 h) on phase composition and microhardness of high-nitrogen steels was investigated. Before age hardening treatments, specimens of V-free and V-alloyed steels, Fe-23Cr-17Mn-0.1C-0.6N (0V-HNS) and Fe-19Cr-22Mn-1.5V-0.3C-0.9N (1.5V-HNS), were water-quenched after 1200°C (for 0.5 h) to produce supersaturated solid solution of interstitial atoms (nitrogen and carbon) in austenite (7% ferrite in 0V-HNS, no ferrite and <5% VN precipitates in 1.5V-HNS were formed). V-alloying changes a kinetics of age-hardening in high-nitrogen steels. According to XRD data, aging at 700 and 800°C results in decomposition of austenite and ferrite in 0V-HNS and formation of duplex microstructure, which consist of high-nitrogen austenite, ferrite, Cr2(N, C) precipitates and intermetallic σ-phase. Such duplex microstructure consists of two types of grains: (1) austenitic grains with precipitates mainly along grain boundaries possess lower microhardness characteristics (about 3.5 GPa); and (2) decomposed multiphase grains have high microhardness (4.5-5.5 GPa depending on aging duration). After aging of vanadium-containing steel at 700 and 800°C, rather homogeneous composite structure forms, which consists of high-nitrogen austenite, ferrite and (V, Cr) (N, C) particles randomly distributed both on grain boundaries and in grain bodies. This stricture possesses high microhardness values about 4.0-4.5 GPa. Independently on age hardening regime and steel composition, the most pronounced effects of hardening occur during short-time age hardening regimes (0.5-1 h).
Режим доступа: по договору с организацией-держателем ресурса
Lingua:inglese
Pubblicazione: 2018
Soggetti:
электронный ресурс
труды учёных ТПУ
упрочнение
фазовый состав
микротвердость
легированные стали
аустенитные стали
Accesso online:https://doi.org/10.1063/1.5083426
Natura: Elettronico Capitolo di libro
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=659194

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