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The effect of σ-phase formation on long-term durability of welding joints in SUPER 304H steels
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SYSNO ASEP 0467327 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název The effect of σ-phase formation on long-term durability of welding joints in SUPER 304H steels Tvůrce(i) Horváth, J. (CZ)
Král, Petr (UFM-A) RID, ORCID
Janovec, J. (CZ)Celkový počet autorů 3 Zdroj.dok. Acta Physica Polonica A, Vol. 130, č. 4. - Warszawa : Polish Academy of Sciences Publishing House, 2016 - ISSN 0587-4246 Rozsah stran s. 960-962 Poč.str. 3 s. Forma vydání Tištěná - P Akce Conference on Applied Crystallography /23./ Datum konání 20.09.2015 - 24.09.2015 Místo konání Krynica Zdrój Země PL - Polsko Typ akce WRD Jazyk dok. eng - angličtina Země vyd. PL - Polsko Klíč. slova Durability ; Scanning electron microscopy ; Welding Vědní obor RIV JG - Hutnictví, kovové materiály Institucionální podpora UFM-A - RVO:68081723 UT WOS 000388580800041 EID SCOPUS 84996835477 DOI https://doi.org/10.12693/APhysPolA.130.960 Anotace Article presents results on the analysis of secondary phases formed in the medium-term static isothermal ageing welding joints of a SUPER 304H (675°C/2 × 104 h). The investigations of the precipitates were focused on the occurrence of σ-phase because its formation leads to significant deterioration of mechanical properties. The microstructure was investigated on microscopic level by scanning/transmission electron microscopy. The distribution and quantification of brittle σ-phase were studied on macroscopic level by color etching method using light optical microscopy. The effect of microstructural changes (σ-phase formation) on the impact strength of an aged base material was investigated. For comparison impact tests on received state material were also performed. The results showed that long-term ageing led to the significant reduction of impact strength as a result of the formation of the σ-phase. It was found that the σ-phase distribution is influenced by welding process. The influence of brittle σ-phase on long-term durability of the degraded steel regarding its insufficient impact strength has been discussed. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2017
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