Wu Xiangyu,Dong Bingcheng,Wang Zifei,et al.Modification Effect and Mechanism of La-Ce on Inclusions in GCr15 Bearing Steel[J].Special Steel,2024,45(02):39-45.
Wu Xiangyu,Dong Bingcheng,Wang Zifei,et al.Modification Effect and Mechanism of La-Ce on Inclusions in GCr15 Bearing Steel[J].Special Steel,2024,45(02):39-45. DOI: 10.20057/j.1003-8620.2023-00234.
Modification Effect and Mechanism of La-Ce on Inclusions in GCr15 Bearing Steel
In order to investigate the effect of Rare Earth La-Ce on the modification of inclusions in GCr15 bearing steel, a high-temperature tube furnace with a nominal capacity of 1 kg was used to smelt 6 heats of GCr15 bearing steel ingots with different La-Ce contents. Characterization methods such as optical microscopy and scanning electron microscopy were used, and the transformation law of inclusions in GCr15 steel at different La-Ce contents was studied using FactSage thermodynamic software. The results show that the typical inclusions in GCr15 bearing steel without adding La-Ce are Al
2
O
3
and MnS, and the addition of La-Ce will modify it to more complex Rare Earth inclusions. With the increase of La-Ce content, the transformation law of inclusions in steel at 1 600 ℃ is Al
2
O
3
→ REAlO
3
→ RE
2
O
3
→ RE
2
O
2
S →RE
2
O
2
S+RE
x
S
y
(RE is La、Ce). With the increase of La-Ce content, the density of inclusions and the average aspect ratio in the steel both decrease first and then increase. When the La-Ce content is 96 ×10
-6
, Al
2
O
3
and MnS were both transformed into spherical RE
2
O
2
S · RE
x
S
y
composite rare earth inclusions. The number of inclusions in the steel was at a low level and the overall morphology of the inclusions was well controlled.
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