The influence of second-phase particles on austenite grain growth behavior in Nb-Ti microalloyed steel

HUANG Jian; XU Haijian; PANG Zongxu; ZHANG Jianping; WANG Yong; LI Tianyi

doi:10.7513/j.issn.1004-7638.2025.04.023

Volume 46 Issue 4

Aug. 2025

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HUANG Jian, XU Haijian, PANG Zongxu, ZHANG Jianping, WANG Yong, LI Tianyi. The influence of second-phase particles on austenite grain growth behavior in Nb-Ti microalloyed steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(4): 174-181. doi: 10.7513/j.issn.1004-7638.2025.04.023

Citation:

HUANG Jian, XU Haijian, PANG Zongxu, ZHANG Jianping, WANG Yong, LI Tianyi. The influence of second-phase particles on austenite grain growth behavior in Nb-Ti microalloyed steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(4): 174-181. doi: 10.7513/j.issn.1004-7638.2025.04.023

Citation:

HUANG Jian, XU Haijian, PANG Zongxu, ZHANG Jianping, WANG Yong, LI Tianyi. The influence of second-phase particles on austenite grain growth behavior in Nb-Ti microalloyed steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(4): 174-181. doi: 10.7513/j.issn.1004-7638.2025.04.023

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The influence of second-phase particles on austenite grain growth behavior in Nb-Ti microalloyed steel

doi: 10.7513/j.issn.1004-7638.2025.04.023

HUANG Jian^{1, 2
,
,},
XU Haijian³,
PANG Zongxu^{1, 2},
ZHANG Jianping^{1, 2},
WANG Yong^{1, 2},
LI Tianyi^{1, 4}

1.
State Key Laboratory of Metallic Materials for Marine Equipment and Applications, Anshan 114009, Liaoning, China
2.
Iron & Steel Research Institutes of Ansteel Group Corporation, Anshan 114009, Liaoning, China
3.
Angang Steel Co., Ltd., Anshan 114009, Liaoning, China
4.
Ansteel Group Beijing Research Institute Co., Ltd., Beijing 102200, China

More Information

Received Date: 2024-07-22
Available Online: 2025-08-31
Publish Date: 2025-08-31

Abstract

Abstract

The heat treatment experiments were conducted on Nb-Ti microalloyed steel at 1050-1250 ℃ for 5-240 minutes to study the austenite grain growth behaviour. Thermo-calc and TEM were used to analyze the precipitation particles under different heating processes, and the grain growth mode was predicted using the HUMPHREYS' theory. The results showed that as the austenitization temperature increased, the mass ratio of Nb/Ti in the NbC particles gradually decreased. The grain size was small and uniform when the temperature was kept at 1050-1100 ℃ for 1 hour. As the temperature increased to 1150 ℃, abnormal grain growth occurred. When heated at 1250 ℃, the grain size coarsened significantly. The actual grain growth mode under each process was the same as predicted by the HUMPHREYS' model. Considering the austenite grain size and the dissolution and precipitation patterns of microalloyed elements during the heating process, the optimal heating temperature for the experimental steel is around 1200 ℃.
- Nb-Ti microalloyed steel,
- austenite grain size,
- grain growth kinetics,
- second-phase,
- HUMPHREYS' model

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References(24)

References

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