Effect of Zr content on strain-induced precipitation behavior of Ti–Zr microalloyed low-carbon steel

Hanyu Luo; Xuegang Xiong; Yiyue Lai; Jianchun Cao; Lisheng Yang; Jinchang Zhang

doi:10.1515/ijmr-2023-0355

Article

Effect of Zr content on strain-induced precipitation behavior of Ti–Zr microalloyed low-carbon steel

Hanyu Luo , Xuegang Xiong , Yiyue Lai , Jianchun Cao , Lisheng Yang and Jinchang Zhang

Published/Copyright: February 10, 2025

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From the journal International Journal of Materials Research Volume 116 Issue 2

Abstract

With two different Zr content Ti–Zr microalloyed low-carbon steels, isothermal relaxation tests at 875–950 °C were conducted using a Gleeble-3500 thermal simulation testing machine. Based on the Avrami equation, the thermodynamic and kinetic model for the precipitation of Ti ( k 1 + m 1 ) Zr ( k 2 + m 2 ) C ( k 1 + k 2 ) N ( m 1 + m 2 ) in austenite was established. The results indicate that the microalloyed elements in Ti–Zr microalloyed low-carbon steel will form composite precipitates through replacement and heterogeneous mechanisms, and nucleate and precipitate at grain boundaries and dislocations in the form of (Ti, Zr) (C, N). For the nucleation and precipitation of carbonitrides at dislocations in 0.035Zr steel and 0.091Zr steel, their nucleation rate–temperature curves (NrT) and Precipitation–time–temperature (PTT) curves intersect at a certain point. The increase in Zr content suppresses the precipitation of carbonitrides from austenite, reducing the strain-induced precipitation in Ti–Zr microalloyed low-carbon steel during rolling process.

Keywords: Ti–Zr microalloyed steel; thermodynamics and kinetics; strain-induced precipitation; composite precipitates

Corresponding author: Jianchun Cao, Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, P.R. China, E-mail: nmcjc@163.com

Research ethics: Not applicable.
Informed consent: Not applicable.
Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.
Use of Large Language Models, AI and Machine Learning Tools: None declared.
Conflict of interest: The authors state no conflict of interest.
Research funding: This work was financially supported by the National Natural Science Foundation of China (no. 51761019) and the Vanadium Titanium Alliance Collaborative Project (2022FTLMXTXM-03).
Data availability: The raw data can be obtained on request from the corresponding author.

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Received: 2023-12-01

Accepted: 2024-10-09

Published Online: 2025-02-10

Published in Print: 2025-02-25

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Articles in the same Issue

https://doi.org/10.1515/ijmr-2023-0355

Keywords for this article

Ti–Zr microalloyed steel; thermodynamics and kinetics; strain-induced precipitation; composite precipitates