Number of the records: 1
The effect of σ-phase formation on long-term durability of welding joints in SUPER 304H steels
- 1.
SYSNO ASEP 0467327 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title The effect of σ-phase formation on long-term durability of welding joints in SUPER 304H steels Author(s) Horváth, J. (CZ)
Král, Petr (UFM-A) RID, ORCID
Janovec, J. (CZ)Number of authors 3 Source Title Acta Physica Polonica A, Vol. 130, č. 4. - Warszawa : Polish Academy of Sciences Publishing House, 2016 - ISSN 0587-4246 Pages s. 960-962 Number of pages 3 s. Publication form Print - P Action Conference on Applied Crystallography /23./ Event date 20.09.2015 - 24.09.2015 VEvent location Krynica Zdrój Country PL - Poland Event type WRD Language eng - English Country PL - Poland Keywords Durability ; Scanning electron microscopy ; Welding Subject RIV JG - Metallurgy Institutional support UFM-A - RVO:68081723 UT WOS 000388580800041 EID SCOPUS 84996835477 DOI https://doi.org/10.12693/APhysPolA.130.960 Annotation 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. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2017
Number of the records: 1