Effect of Mn content on microstructure and mechanical properties of medium carbon low Si bainitic steel

Yu Jinrui; Yu Xinhong; Zhang Yu; Feng Yisheng; Zhao Ertuan

doi:10.7513/j.issn.1004-7638.2024.03.020

Volume 45 Issue 3

Jul. 2024

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Yu Jinrui, Yu Xinhong, Zhang Yu, Feng Yisheng, Zhao Ertuan. Effect of Mn content on microstructure and mechanical properties of medium carbon low Si bainitic steel[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(3): 147-154. doi: 10.7513/j.issn.1004-7638.2024.03.020

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Yu Jinrui, Yu Xinhong, Zhang Yu, Feng Yisheng, Zhao Ertuan. Effect of Mn content on microstructure and mechanical properties of medium carbon low Si bainitic steel[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(3): 147-154. doi: 10.7513/j.issn.1004-7638.2024.03.020

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Effect of Mn content on microstructure and mechanical properties of medium carbon low Si bainitic steel

doi: 10.7513/j.issn.1004-7638.2024.03.020

Yu Jinrui^1
,,
Yu Xinhong¹,
Zhang Yu¹,
Feng Yisheng^{1, 2},
Zhao Ertuan^{1, 2
,
,}

1.
School of Mechanical Engineering, Shandong University of Technology, Zibo 255049, Shandong,China
2.
Star Spring Technology Co., Ltd., Zibo 255049, Shandong,China

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Received Date: 2023-06-14
Publish Date: 2024-07-02

Abstract

Abstract

Four medium-carbon low-Si bainitic steels with different Mn contents(0.76%, 1.29%, 1.53%, 1.85%) were designed and smelted. The effect of manganese content on the microstructure and mechanical properties of the test steel was studied by OM, SEM, XRD and tensile and impact tests. The results show that the phase transformation between ferrite and pearlite is inhibited by manganese. Manganese addition decreases the nucleation driving force of bainite, causing the declining maximum transformation amount of bainite, and increases the size and content of the remaining supercooled austenite after bainite transformation stagnation. Most of the remaining austenite decomposes into coarse carbide and ferrite mixed structure in the subsequent isothermal process, and forms local coarse structure around the bainite lath. A small amount of the austenite stabilize to room temperature and then form retained austenite. With the increase of manganese content, the yield strength and impact toughness of the test steel gradually decrease, and the tensile strength firstly increase and then decrease due to the competition between alloying and microstructure coarsening. Considering the complexity of heat treatment and balanced mechanical properties of bainitic steel, 1.29% manganese content is proposed for spring steel.
- low silicon bainite steel,
- manganese content,
- carbide,
- retained austenite

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References(24)

References

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