Ti/N control of precipitates and toughness in welded Mg-treated shipbuilding steel plate

ZHANG Yuqi; YANG Jian; ZHANG Yinhui

doi:10.7513/j.issn.1004-7638.2026.03.020

Volume 47 Issue 3

Jun. 2026

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ZHANG Yuqi, YANG Jian, ZHANG Yinhui. Ti/N control of precipitates and toughness in welded Mg-treated shipbuilding steel plate[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(3): 172-180. doi: 10.7513/j.issn.1004-7638.2026.03.020

Citation:

ZHANG Yuqi, YANG Jian, ZHANG Yinhui. Ti/N control of precipitates and toughness in welded Mg-treated shipbuilding steel plate[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(3): 172-180. doi: 10.7513/j.issn.1004-7638.2026.03.020

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Ti/N control of precipitates and toughness in welded Mg-treated shipbuilding steel plate

doi: 10.7513/j.issn.1004-7638.2026.03.020

School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China

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Received Date: 2025-12-14
Accepted Date: 2026-01-14
Rev Recd Date: 2025-12-31
Publish Date: 2026-06-29

Abstract

Abstract

In this study, the effect of the Ti/N ratio on the impact toughness at -20 ℃ of Mg-treated shipbuilding steel plates after high heat input welding of 400 kJ/cm had been investigated. When the Ti/N ratio is increased from 3.00 (TN30) to 5.67 (TN57), the main precipitated particles are TiN particles. The average size of nano secondary phase particles increases from approximately 150 nm to 205 nm, with the particle number density in TN57 being approximately 2.5 times than that in TN30. In TN30 steel, Mg-Ti-O-MnS composite inclusions with a size about 3 μm can effectively induce IAF nucleation. The ferrite laths and dislocation pile-ups significantly enhance its toughness. TN57 steel contains Ti(C, N) composite inclusions which are regular in shape, sharply angular and approximately 5 μm in size. These coarse carbonitrides are detrimental to the toughness of the steel. As the Ti/N ratio is increased from 3.00 to 5.67, the low-temperature impact toughness at -20 ℃ decreases from 183 J to 49 J.
- Mg treatment,
- Ti/N ratio,
- high heat input welding,
- heat affected zone,
- low-temperature impact toughness

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References(30)

References

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