Precipitation behavior of composite precipitates in Nb-Ti micro-alloy EH36 offshore steel

Qiao Jialong; Guo Feihu; Shi Pengzhao; Cao Ruihong; Xiong Chenguang; Xu Lijun

doi:10.7513/j.issn.1004-7638.2024.01.018

Volume 45 Issue 1

Feb. 2024

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Qiao Jialong, Guo Feihu, Shi Pengzhao, Cao Ruihong, Xiong Chenguang, Xu Lijun. Precipitation behavior of composite precipitates in Nb-Ti micro-alloy EH36 offshore steel[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(1): 122-130. doi: 10.7513/j.issn.1004-7638.2024.01.018

Citation:

Qiao Jialong, Guo Feihu, Shi Pengzhao, Cao Ruihong, Xiong Chenguang, Xu Lijun. Precipitation behavior of composite precipitates in Nb-Ti micro-alloy EH36 offshore steel[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(1): 122-130. doi: 10.7513/j.issn.1004-7638.2024.01.018

Citation:

Qiao Jialong, Guo Feihu, Shi Pengzhao, Cao Ruihong, Xiong Chenguang, Xu Lijun. Precipitation behavior of composite precipitates in Nb-Ti micro-alloy EH36 offshore steel[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(1): 122-130. doi: 10.7513/j.issn.1004-7638.2024.01.018

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Precipitation behavior of composite precipitates in Nb-Ti micro-alloy EH36 offshore steel

doi: 10.7513/j.issn.1004-7638.2024.01.018

1.
National Engineering Research Center of Continuous Casting Technology, Iron and Steel Research Institute Co., Ltd., Beijing 100081, China
2.
Xinyu Iron and Steel Group Co., Ltd. , Xinyu 338001, Jiangxi, China
3.
School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning , China

Received Date: 2023-06-26
Publish Date: 2024-02-29

Abstract

Abstract

Based on the principal component regression analysis of the factors affecting the yield strength of EH36 offshore steel, combined with the solid solution precipitation calculation of composite precipitation phase and the classical precipitation kinetics theory, the main factors affecting the yield strength of EH36 offshore steel and the precipitation behavior of composite precipitation phase in γ were systematically studied, and the influence of austenite deformation and energy storage during rolling on the precipitation kinetics of composite precipitation phase was discussed. The results show that the main factors affecting the yield strength of EH36 offshore steel are Ti, Nb and N. MN and M(C,N) began to precipitate at 1728.5 K and 1430.0 K, respectively, and were mainly (Ti,Nb)N and (Nb,Ti)C. In the austenite phase region, the maximum precipitation amounts of MN and M(C,N) are 0.0165% and 0.0277% respectively, and the maximum precipitation volume fractions are 0.000228% and 0.000389% respectively. The fastest precipitation temperatures for grain boundary nucleation are 1580.3 K and 1228.3 K respectively. With the increase of deformation energy storage, the relative nucleation rate of MN and M(C,N) increases, the incubation period of precipitation is obviously shortened and the precipitation strengthening effect is enhanced.
- EH36 offshore steel,
- yield strength,
- composite precipitates,
- principal component analysis,
- PTT curve,
- NrT curve,
- deformation energy storage

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References(21)

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