Effect of Mg on carbides in 21-4N valve steel

Ji Dengping; Zhu Haoran; Liu Beibei; Sun Han; Xu Xiangyu; Fu Jianxun

doi:10.7513/j.issn.1004-7638.2024.03.027

Volume 45 Issue 3

Jul. 2024

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Article Navigation > IRON STEEL VANADIUM TITANIUM > 2024 > 45(3): 195-199

Ji Dengping, Zhu Haoran, Liu Beibei, Sun Han, Xu Xiangyu, Fu Jianxun. Effect of Mg on carbides in 21-4N valve steel[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(3): 195-199. doi: 10.7513/j.issn.1004-7638.2024.03.027

Citation:

Ji Dengping, Zhu Haoran, Liu Beibei, Sun Han, Xu Xiangyu, Fu Jianxun. Effect of Mg on carbides in 21-4N valve steel[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(3): 195-199. doi: 10.7513/j.issn.1004-7638.2024.03.027

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Effect of Mg on carbides in 21-4N valve steel

doi: 10.7513/j.issn.1004-7638.2024.03.027

Ji Dengping^{1, 2
,},
Zhu Haoran¹,
Liu Beibei¹,
Sun Han¹,
Xu Xiangyu¹,
Fu Jianxun^{1
,
,}

1.
School of Materials Science and Engineering, Shanghai University, Center for Advanced Solidification Technology，State Key Laboratory of Advanced Special Steel, Shanghai 200444, China
2.
Zhejiang Qingshan Iron and Steel Co., Ltd., Lishui 325000, Zhejiang, China

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Received Date: 2022-08-08
Publish Date: 2024-07-02

Abstract

Abstract

In order to explore the influence of different magnesium content on primary carbides in 21-4N valve steel, 21-4N valve steel with different magnesium content was smelted in a laboratory high temperature resistance furnace, and the research was carried out by use of Zeiss metallographic microscope, scanning electron microscope and electrolytic corrosion. The results show that with the increase of Mg content in 21-4N steel, both the average maximum size and area ratio of carbides firstly decrease and then increase. The addition of trace magnesium is helpful to improve the size and distribution of Cr-rich precipitated carbides in steel. When the mass fraction of magnesium is 1.6×10⁻⁵, the average maximum size of precipitated carbides is 60.55 μm and its area ratio is 10.43%, and most of them are granular in steel, and the continuity is destroyed. The reason is that the segregation of magnesium at the grain boundary can inhibit the diffusion of alloy elements such as C and Cr, and then block the continuous growth of carbide, thus achieving the effect of refining the carbide size.
- 21-4N valve steel,
- Mg modification,
- primary carbide

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References(17)

References

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