TY - JOUR N2 - 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. L1 - http://www.czasopisma.pan.pl/Content/119290/PDF-MASTER/AMM-2021-4-19-Byoungchul%20Hwang.pdf L2 - http://www.czasopisma.pan.pl/Content/119290 PY - 2021 IS - No 4 EP - 1022 DO - 10.24425/amm.2021.136417 KW - 347 stainless steel KW - in-situ KW - high temperature KW - fracture behaviour KW - welding KW - confocal laser scanning microscope (CLSM) A1 - Ko, Seok-Woo A1 - Park, Hyeonwoo A1 - Yoo, Il A1 - Kim, Hansoo A1 - Lee, Joonho A1 - Hwang, Byoungchul PB - Institute of Metallurgy and Materials Science of Polish Academy of Sciences PB - Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences VL - vol. 66 DA - 2021.12.28 T1 - In-situ Observation of High-Temperature Fracture Behaviour of 347 Stainless Steel Subjected to Simulated Welding Process SP - 1019 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/119290 T2 - Archives of Metallurgy and Materials ER -