The effect of non-metallic inclusions in refining microstructure and improving cryogenic toughness of novel high-Mn steel weld metals for LNG tanks

Zhang, Jinshuai; Li, Guangqiang; Wang, Honghong; Wan, Xiangliang; Hu, Mingfeng; Meng, Qingrun

doi:10.1007/s40194-022-01365-7

Cited by 4 publications

(1 citation statement)

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“…The formation of MnS and Al 2 O 3 inclusions are generally unavoidable for the welding process in high-Mn steel [6,7]. Such coarse inclusions generally tend to act as the crack initiation due to their high hardness, causing fractures and deteriorating the impact toughness of the weld metal [8][9][10]. Thus, many studies are devoted to controlling the composition, number and size of inclusions to optimise the mechanical properties [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Evolution of inclusions in novel cryogenic high-Mn austenitic steel weld metal with cerium addition

Zhang

Wang

et al. 2023

Science and Technology of Welding and Joining

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Cerium (Ce) was effectively transitioned into the high-Mn austenitic steel weld metal under submerged arc welding by adding cerium dioxide and calcium silicon reducing agents into flux. The evolution behaviours of the composition, number density and size of inclusions in weld metal with different Ce contents were systematically investigated by thermodynamic calculation and experiments. The results show that the number density of inclusions increased and average size decreased with the increase of Ce content from 0 to 0.087 wt-%. Meanwhile, and the percentage of inclusions number with size less than 0.80 μm increased from 79.28% to 91.43%. The evolutionary process of inclusions was Al 2 O 3 → Al 11 O 18 Ce → CeAlO 3 → Ce 2 O 3 → Ce 2 O 2 S with the increase of Ce content in the present weld metal. In particular, Ce-O-S-Al inclusion was extracted by in-situ sample preparation method, which proved its internal structure and evolution process. The complete formation model of Ce-Al-O-S system was also established.

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