The role of the strengthening phases on the HAZ liquation cracking in a cast Ni‑based superalloy used in industrial gas turbines

• Autorzy: Rakoczy Łukasz , Grudzień-Rakoczy Małgorzata , Rutkowski Bogdan , Cygan Rafał , Hanning Fabian , Cios Grzegorz , Habisch Stefan , Andersson Joel , Mayr Peter , Zielińska-Lipiec Anna

Identyfikatory

DOI

10.1007/s43452-023-00659-x

• Języki publikacji: EN

Abstrakty

EN

This work presents the influence of microstructural constituents on liquation crack formation in the cast Ni-based superalloy, Rene 108. The investigation was divided into three parts: characterisation of the material's microstructure in pre-weld condition, hot ductility studies and analysis of liquation cracking induced by the gas tungsten arc welding process. Using advanced electron microscopy techniques it is shown that the base material in pre-weld condition is characterised by a complex microstructure. The phases identified in Rene 108 include γ matrix, γ' precipitates, MC and M₂₃C₆ carbides, and M₅B₃ borides. Based on Gleeble testing, it was found that Rene 108 is characterised by high strength at elevated temperatures with a maximum of 1107 MPa at 975 °C. As a result of constitutional liquation, the superalloy’s strength and ductility were significantly reduced. The nil strength temperature was equal to 1292 °C, while the nil ductility temperature was 1225 °C. The low ductility recovery rate (32.1), ratio of ductility recovery (36.2) and hot cracking factor (R_f = 0.05) values confirmed the low weldability of Renѐ 108. In the heat-affected zone (HAZ) induced by welding, constitutional liquation of mainly γ' precipitates, with a contribution of M₂₃C₆ carbides and M₅B₃ borides, was observed. The thin non-equilibrium liquid film, which formed along high-angle grain boundaries, led to crack initiation and their further propagation during cooling. The eutectic γ–γ' re-solidification products are visible on the crack edges.

Słowa kluczowe

EN

constitutional liquation; liquation cracking; René 108; STEM

PL

pęknięcie likwacyjne; René 108; STEM

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2023
• Tom: Vol. 23, no. 2
• Strony: art. no. e119, 2023
• Opis fizyczny: Bibliogr. 41 poz., rys., tab., wykr.

Twórcy

autor

Rakoczy Łukasz

• Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Mickiewicza 30, 30‑059 Krakow, Poland

• https://orcid.org/0000-0002-2205-681X

autor

Grudzień-Rakoczy Małgorzata

• Łukasiewicz Research Network-Krakow Institute of Technology, Zakopiańska 73, 30‑418 Krakow, Poland

• https://orcid.org/0000-0002-5875-9007

autor

Rutkowski Bogdan

• Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Mickiewicza 30, 30‑059 Krakow, Poland

• https://orcid.org/0000-0003-0974-6450

autor

Cygan Rafał

• Investment Casting Division, Consolidated Precision Products Corporation, Hetmańska 120, 35‑078 Rzeszow, Poland

autor

Hanning Fabian

• Department of Engineering Science, University West, Gustava Melins Gata 2, 46132 Trollhattan, Sweden

• https://orcid.org/0000-0002-1607-9177

autor

Cios Grzegorz

• Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, Mickiewicza 30, 30‑059 Krakow, Poland

• https://orcid.org/0000-0003-4269-5456

autor

Habisch Stefan

• Chair of Materials Engineering of Additive Manufacturing, Technical University of Munich, Boltzmannstr. 15, 85748 Garching/Munich, Germany

autor

Andersson Joel

• Department of Engineering Science, University West, Gustava Melins Gata 2, 46132 Trollhattan, Sweden

autor

Mayr Peter

• Chair of Materials Engineering of Additive Manufacturing, Technical University of Munich, Boltzmannstr. 15, 85748 Garching/Munich, Germany

• https://orcid.org/0000-0003-2530-4644

autor

Zielińska-Lipiec Anna

• Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Mickiewicza 30, 30‑059 Krakow, Poland

• https://orcid.org/0000-0002-9660-9333

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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).