Effect of bismuth content on the microstructure and properties of free cutting steels

Li Binzhou; Wang Dong; Wang Yijia; Jiang Yuanbo; Shao Zhibao; Li Changsheng

doi:10.7513/j.issn.1004-7638.2024.02.027

Volume 45 Issue 2

Feb. 2024

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Li Binzhou, Wang Dong, Wang Yijia, Jiang Yuanbo, Shao Zhibao, Li Changsheng. Effect of bismuth content on the microstructure and properties of free cutting steels[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(2): 190-197. doi: 10.7513/j.issn.1004-7638.2024.02.027

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Li Binzhou, Wang Dong, Wang Yijia, Jiang Yuanbo, Shao Zhibao, Li Changsheng. Effect of bismuth content on the microstructure and properties of free cutting steels[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(2): 190-197. doi: 10.7513/j.issn.1004-7638.2024.02.027

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Effect of bismuth content on the microstructure and properties of free cutting steels

doi: 10.7513/j.issn.1004-7638.2024.02.027

Li Binzhou^{1, 2
,},
Wang Dong¹,
Wang Yijia^{1, 2},
Jiang Yuanbo^{1, 2},
Shao Zhibao³,
Li Changsheng³

1.
State Key Laboratory of Metal Materials for Marine Equipment and Application, Anshan 114009, Liaoning, China
2.
Ansteel Beijing Research Institute Co., Ltd., Beijing 102200, China
3.
The State Key Lab of Rolling & Automation, Northeastern University, Shenyang 110819, Liaoning, China

More Information

Received Date: 2022-12-09
Available Online: 2024-04-30
Publish Date: 2024-04-30

Abstract

Abstract

The bismuth-containing free-cutting steel served as an environment-friendly material has a broad application prospect. Bismuth was alloyed by preparing bismuth ferromanganese alloy, which was then added to the molten steel in the process of vacuum induction melting. After casting the melt and hot rolling, three kinds of bismuth-containing free cutting steels were obtained. The effect of bismuth content on the second phase, mechanical properties and cutting properties of steels was studied. With the increase of bismuth content from 0.013% to 0.069%, the size of MnS decreased by about 45% and the shape changed from rod to ball. The yield strength, the hardness of matrix and second phase, and the impact energy of the steels decreased. The tensile strength increased slightly, and the elongation of the experimental steel increased greatly. The comprehensive mechanical properties of the steel decreased slightly. The results of cutting experiments showed that with the increase of bismuth content, the wear of milling tools decreased significantly; the surface flatness and smoothness of the steels increased; the chip shapes changed from long strip to short spiral; the chip breakage degree was greater; and the cutting performance was significantly improved.
- free cutting steel,
- bismuth,
- manganese sulfide,
- machinability,
- mechanical property

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References(17)

References

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