In-situ Observation of High-Temperature Fracture Behaviour of 347 Stainless Steel Subjected to Simulated Welding Process

• Autorzy: Ko Seok-Woo , Park Hyeonwoo , Yoo Il , Kim Hansoo , Lee Joonho , Hwang Byoungchul

Identyfikatory

DOI

10.24425/amm.2021.136417

• Języki publikacji: EN

Abstrakty

EN

In-situ study on the high-temperature fracture behaviour of 347 stainless steel was carried out by using a confocal laser scanning microscope (CLSM). The welding microstructures of the 347 stainless steel were simulated by subjecting the steel specimen to solution and aging treatments. Undissolved NbC carbides were present within grains after solution treatment, and M₂₃C₆ carbides were preferentially formed at grain boundaries after subsequent aging treatment. The M₂₃C₆ carbides formed at grain boundaries worked as stress concentration sites and thus generated larger cracks during high-temperature tensile testing. In addition, grain boundary embrittlement was found to be a dominant mechanism for the high-temperature fracture of the 347 stainless steel because vacancy diffusion in the Cr-depleted zones enhances intergranular fracture due to the precipitation of M₂₃C₆ carbides at grain boundaries.

Słowa kluczowe

EN

347 stainless steel; in-situ; high temperature; fracture behavior; welding; confocal laser scanning microscope; CLSM

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2021
• Tom: Vol. 66, iss. 4
• Strony: 1019--1022
• Opis fizyczny: Bibliogr. 21 poz., fot., rys.

Twórcy

autor

Ko Seok-Woo

• Seoul National University of Science and Technology, Department of Materials Science and Engineering, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Republic of Korea

• https://orcid.org/0000-0001-6317-8808

autor

Park Hyeonwoo

• Korea University, Department of Materials Science and Engineering, Seoul 02841, Republic of Korea

• https://orcid.org/0000-0003-2562-4656

autor

Yoo Il

• ADNOC LNG, Abu Dhabi, United Arab Emirates

• https://orcid.org/0000-0002-5808-2315

autor

Kim Hansoo

• Korea University, Department of Materials Science and Engineering, Seoul 02841, Republic of Korea

• https://orcid.org/0000-0002-4014-8670

autor

Lee Joonho

• Korea University, Department of Materials Science and Engineering, Seoul 02841, Republic of Korea

• https://orcid.org/0000-0002-9464-6480

autor

Hwang Byoungchul

• Seoul National University of Science and Technology, Department of Materials Science and Engineering, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Republic of Korea

• https://orcid.org/0000-0001-6330-4747

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Uwagi

1. This study was supported by the research Program funded by the SeoulTech (Seoul National University of Science and Technology).

2. Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).