1.上海大学材料科学与工程学院先进凝固技术中心,省部共建高品质特殊钢冶金与制备国家重点实验室,上海 200444
2.山钢股份莱芜分公司技术中心,莱芜 271104
吴翔宇(1992—),男,博士; E-mail:1003198443@qq.com
付建勋(1969—),男,博士,教授; E-mail:fujianxun@shu.edu.cn
收稿:2023-11-17,
纸质出版:2024-03-30
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吴翔宇,董丙成,王梓菲等.La-Ce对GCr15轴承钢中夹杂物的改质效果及机理[J].特殊钢,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.
吴翔宇,董丙成,王梓菲等.La-Ce对GCr15轴承钢中夹杂物的改质效果及机理[J].特殊钢,2024,45(02):39-45. DOI: 10.20057/j.1003-8620.2023-00234.
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.
为了探究稀土La-Ce对GCr15轴承钢中夹杂物的改质效果,采用了公称容量为1 kg的高温管式炉,冶炼了6炉不同La-Ce含量的GCr15轴承钢钢锭,借助光学显微镜、扫描电镜等表征手段,并结合FactSage热力学软件对不同La-Ce含量的GCr15钢中夹杂物的转化规律进行研究。结果表明,未添加La-Ce的GCr15轴承钢中典型夹杂物为不规则状的Al
2
O
3
和MnS,La-Ce的添加会将其改质为类型较为复杂的稀土夹杂物,随着La-Ce含量的提高,1 600 ℃下钢中夹杂物的转化规律为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为La-Ce)。当La-Ce含量为96×10
-6
时,Al
2
O
3
和MnS均被改质为球状的RE
2
O
2
S·RE
x
S
y
复合稀土夹杂物,钢中夹杂物的数量处于较低水平且夹杂物的整体形貌控制较好。
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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