Effect of Zr on the microstructure and properties of direct-quenched Ti microalloyed high-strength low carbon martensitic steel

XIONG Xuegang; LUO Hanyu; ZENG Han; CAO Jianchun; ZHOU Xianchao; WANG Chuangwei

doi:10.7513/j.issn.1004-7638.2025.06.018

Volume 46 Issue 6

Dec. 2025

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XIONG Xuegang, LUO Hanyu, ZENG Han, CAO Jianchun, ZHOU Xianchao, WANG Chuangwei. Effect of Zr on the microstructure and properties of direct-quenched Ti microalloyed high-strength low carbon martensitic steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(6): 147-156. doi: 10.7513/j.issn.1004-7638.2025.06.018

Citation:

XIONG Xuegang, LUO Hanyu, ZENG Han, CAO Jianchun, ZHOU Xianchao, WANG Chuangwei. Effect of Zr on the microstructure and properties of direct-quenched Ti microalloyed high-strength low carbon martensitic steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(6): 147-156. doi: 10.7513/j.issn.1004-7638.2025.06.018

Citation:

XIONG Xuegang, LUO Hanyu, ZENG Han, CAO Jianchun, ZHOU Xianchao, WANG Chuangwei. Effect of Zr on the microstructure and properties of direct-quenched Ti microalloyed high-strength low carbon martensitic steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(6): 147-156. doi: 10.7513/j.issn.1004-7638.2025.06.018

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Effect of Zr on the microstructure and properties of direct-quenched Ti microalloyed high-strength low carbon martensitic steel

doi: 10.7513/j.issn.1004-7638.2025.06.018

1.
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650031, Yunnan, China
2.
State Key Labloratory of Vanadium and Titanium Resource Comprehensive Utilization, Pangang Group Research Institute Co., Ltd., Panzhihua 617000, Sichuan, China
3.
Pangang Group Xichang Steel & Vanadium Co., Ltd., Xichang 615000, Sichuan, China

More Information

Received Date: 2025-01-10
Accepted Date: 2025-04-08
Rev Recd Date: 2025-03-27

Available Online: 2025-12-31

Publish Date: 2025-12-31

Abstract

Abstract

In this work, the effect of Zr on the microstructure, properties, and strengthening mechanism of direct quenched Ti microalloyed high-strength low-carbon martensitic steel was systematically studied, through two-stage mechanical processing combined with direct quenching process. And the final rolling temperature of the steel ranged from 950 ℃ to 850 ℃. The results show that as the final rolling temperature decreases, the hardness of both Ti steel and Ti-Zr steel increases first and then decreases, and the number of precipitates in Ti steel decreases gradually, while the number of precipitates in Ti-Zr steel increases first and then decreases. The hardness (HV) of Ti steel reaches the highest value of 338.8 when final rolling at 875 ℃, and the highest hardness (HV) of Ti-Zr steel reaches the highest value of 332.2 when final rolling at 900 ℃. Meanwhile, the uniformity and fineness of the microstructure of Ti microalloyed steel were improved by the addition of Zr, the prior austenite grain size was reduced by 2.9–6.0 µm, the geometrically necessary dislocation density was increased from 1.6×10¹³ m⁻² to 6.6×10¹³ m⁻², and the average size of martensitic blocks was reduced by 0.13–0.38 µm. The solid solution of Ti element in austenite was promoted by the addition of Zr, the precipitation of strain induced carbonitrides in austenite was restrained by more than 10%, and the precipitation strengthening effect was also reduced. Among them, solid solution strengthening and dislocation strengthening were identified as the main strengthening mechanisms of Ti-Zr steel, accounting for approximately 60% of the total yield strength.
- Zr,
- low carbon martensite,
- final rolling temperature,
- precipitation,
- strengthening mechanism

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References(27)

References

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