Analysis of microstructures, inclusions and carbides of G95Cr18 bearing steel billets by mold casting

Fu Yuhao; Wu Qiang; Zhu Haoran; Ji Dengping; Liu Bin; Fu Jianxun

doi:10.7513/j.issn.1004-7638.2024.04.027

Volume 45 Issue 4

Aug. 2024

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Article Navigation > IRON STEEL VANADIUM TITANIUM > 2024 > 45(4): 189-197

Fu Yuhao, Wu Qiang, Zhu Haoran, Ji Dengping, Liu Bin, Fu Jianxun. Analysis of microstructures, inclusions and carbides of G95Cr18 bearing steel billets by mold casting[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(4): 189-197. doi: 10.7513/j.issn.1004-7638.2024.04.027

Citation:

Fu Yuhao, Wu Qiang, Zhu Haoran, Ji Dengping, Liu Bin, Fu Jianxun. Analysis of microstructures, inclusions and carbides of G95Cr18 bearing steel billets by mold casting[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(4): 189-197. doi: 10.7513/j.issn.1004-7638.2024.04.027

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Analysis of microstructures, inclusions and carbides of G95Cr18 bearing steel billets by mold casting

doi: 10.7513/j.issn.1004-7638.2024.04.027

Fu Yuhao^1
,,
Wu Qiang¹,
Zhu Haoran¹,
Ji Dengping^{1, 2},
Liu Bin^{1, 3},
Fu Jianxun^{1
,
,}

1.
Advanced Solidification Technology Center, School of Materials Science and Engineering, Shanghai University, State Key Laboratory of Metallurgy and Manufacture of Advanced Special Steels, Shanghai 200444, China
2.
Zhejiang Qingshan Iron and Steel Co., Ltd., Lishui 323000, Zhejiang, China
3.
Ansteel Beijing Research Institute, Beijing 102200, China

Received Date: 2023-06-28
Publish Date: 2024-08-30

Abstract

Abstract

Based on Thermo-calc software, the matrix structure, phase transformation and carbides precipitation of G95Cr18 bearing steel were analyzed. Metallographic microscope and scanning electron microscope were used to analyze the mold casting billets structures, inclusions and carbides. The research shows that the main components of inclusions in the casting slab of G95Cr18 bearing steel are Ce, O, Al, Ca and a few other elements. The main type of inclusions is rare earth oxygen sulfide Ce-Al-O-Ca-S, and a small amount of magnesia-aluminum spinel Al-Mg-O is also found. The inclusion density is 31 - 48 mm^-2, and the average sizes of inclusions are concentrated in a range of 2.2 μm to 2.6 μm with the inclusion area proportion of 0.02% to 0.03%. The area proportion of carbides from the edge to the core increases from 3.0% to 7.5%, and the morphology of carbides shows a transforming trend of block → rod → strip → network. Most of the network carbides near the core are distributed along the grain boundaries. These types of carbides are composed of bright white Nb-enriched MC carbides and gray M₇C₃ carbides enriched in Cr, respectively. The sizes of MC carbides are smaller than that of M₇C₃ carbides, and they present as massive carbides in the matrix and network carbides in the grain boundary.
- G95Cr18 bearing steel,
- inclusion,
- carbides,
- Thermo-calc software

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References(22)

References

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