Precipitation behavior of the second phase in austenite in Ti-Nb microalloyed steel

LIU Kun; GAN Xiaolong; WANG Wenjun; XIONG Ziliu; LIU Bin; YANG Yang

doi:10.7513/j.issn.1004-7638.2026.03.018

Volume 47 Issue 3

Jun. 2026

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LIU Kun, GAN Xiaolong, WANG Wenjun, XIONG Ziliu, LIU Bin, YANG Yang. Precipitation behavior of the second phase in austenite in Ti-Nb microalloyed steel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(3): 156-163. doi: 10.7513/j.issn.1004-7638.2026.03.018

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LIU Kun, GAN Xiaolong, WANG Wenjun, XIONG Ziliu, LIU Bin, YANG Yang. Precipitation behavior of the second phase in austenite in Ti-Nb microalloyed steel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(3): 156-163. doi: 10.7513/j.issn.1004-7638.2026.03.018

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Precipitation behavior of the second phase in austenite in Ti-Nb microalloyed steel

doi: 10.7513/j.issn.1004-7638.2026.03.018

1.
College of materials science and engineering, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
2.
CITIC Metal Co., Ltd, Beijing 100004, China
3.
Baosteel Central Research Institute, Wuhan 430080, Hubei, China

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Received Date: 2026-01-19
Accepted Date: 2026-02-09
Rev Recd Date: 2026-02-03
Publish Date: 2026-06-29

Abstract

Abstract

Based on the solid solution precipitation and nucleation growth theory of the second phase of microalloyed composite, a thermodynamic and kinetic model for the precipitation of the (Ti, Nb)C composite second phase in austenite in 0.06%C-0.17%Ti-0.03%Nb microalloyed steel was constructed, and the nucleation rate-temperature(NRT) curve and precipitation-time-temperature(PTT) curve of the second phase precipitates in austenite were drawn. The NrT curve of the test steel showed an anti "C" type feature, while the PTT curve showed a typical "C" type feature. The peak nucleation rate was observed at approximately 900 ℃, a temperature which also corresponds to the optimum point for precipitation kinetics. The theoretical results were verified by stress relaxation test. TEM were used to characterize the second phase precipitates in the typical samples of stress relaxation test. The results showed that the second phase precipitates and the matrix met the N-W orientation relationship, mainly composed of (Ti, Nb)C composite carbides precipitated in austenite.
- second phase precipitation,
- theoretical calculation,
- NrT curve,
- PTT curve,
- stress relaxation

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References(19)

References

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