Evolution of the microstructure and mechanical properties of Sanicro 25 austenitic stainless steel after long-term ageing

• Autorzy: Sroka M. , Zieliński A. , Golański G. , Pawlyta M. , Purzyńska H. , Novy F.

Identyfikatory

DOI

10.1007/s43452-023-00690-y

• Języki publikacji: EN

Abstrakty

EN

A newly developed heat-resistant austenitic steel, Sanicro 25 is currently considered the leading candidate material for an advanced ultra-supercritical installation. The test material was subjected to long-term ageing (up to 30,000 h) at 700 and 750 °C, after which investigations into the microstructure, identification of precipitates, and testing of mechanical properties were conducted. Sanicro 25 had an austenitic microstructure with annealed twins and numerous large primary NbX and Z-phase precipitates in the as-received condition. It was found that the long-term ageing of the steel resulted in numerous precipitation processes. For example, M23C6 carbides, Laves, σ and G phases occurred at the grain boundaries. However, Z-phase precipitates, ε_Cu particles, and Laves phase were observed inside the grains. At the same time, compound complexes of precipitates based on the primary Z-phase precipitates were revealed in the microstructure. The ageing process increased the particle size of M23C6 carbides and the σ phase. After longer ageing times, a precipitate-free zone (PFZ) near the grain boundaries was observed. The precipitation processes initially lead to an increase in the strength properties of the steel. However, after 5000 h, an over-ageing effect was observed at 750 °C, which was not observed at 700 °C.

Słowa kluczowe

EN

Sanicro 25 steel; microstructure; precipitation; ageing; mechanical properties

PL

właściwości mechaniczne; mikrostruktura; stal

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2023
• Tom: Vol. 23, no. 3
• Strony: art. no. e149, 2023
• Opis fizyczny: Bibliogr. 32 poz., rys., wykr.

Twórcy

autor

Sroka M.

• Department of Engineering Materials and Biomaterials, Silesian University of Technology, Ul. Konarskiego 18a, 44-100 Gliwice, Poland

• https://orcid.org/0000-0002-8711-5534

autor

Zieliński A.

• Łukasiewicz Research Network - Institute for Ferrous Metallurgy, K. Miarki 12-14, 44-100 Gliwice, Poland

autor

Golański G.

• Department of Materials Engineering, Czestochowa University of Technology, Al. Armii Krajowej 19, 42-200 Częstochowa, Poland

autor

Pawlyta M.

• Materials Research Laboratory, Silesian University of Technology, Ul. Konarskiego 18a, 44-100 Gliwice, Poland

autor

Purzyńska H.

• Łukasiewicz Research Network - Institute for Ferrous Metallurgy, K. Miarki 12-14, 44-100 Gliwice, Poland

autor

Novy F.

• Department of Materials Engineering, University of Zilina, Univerzitná, 8215/1, 010 26 Žilina, Slovakia

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024)