Characterization and evolution of non-metallic inclusions in GCr15 bearing steels during cooling and solidification

被引：22
|
作者：
Cheng, Gong [1 ]
Zhang, Lifeng [2 ]
Ren, Ying [1 ]
机构：
[1] USTB, Sch Met & Ecol Engn, Beijing, Peoples R China
[2] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China
来源：
IRONMAKING & STEELMAKING | 2020年 / 47卷 / 10期
基金：
美国国家科学基金会;
关键词：
Bearing steels; inclusions; non-aqueous electrolysis; cooling and solidification; MAXIMUM INCLUSION; STATISTICS; SIZE; FATIGUE;
D O I：
10.1080/03019233.2020.1719315
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Industrial experiments and thermodynamic calculations were performed to investigate the evolution of non-metallic inclusions during cooling and solidification of GCr15 bearing steels with different steel compositions. Non-metallic inclusions in bloom and rolled rod were characterized using the improved non-aqueous electrolysis method firstly. Inclusions in molten steel were mainly irregular MgO center dot Al2O3 and globular CaO-Al2O3-(MgO). Pure cluster MgO center dot Al2O3, MgO-Al2O3-CaS-(MnS) and MgO-Al2O3-(CaS)-MnS, CaO-Al2O3-(MgO)-CaS, MnS and cubic TiN precipitates were observed in bloom. The high-temperature heating accelerated the precipitation of MnS on the MgO center dot Al2O3 and more MgO-Al2O3-MnS complex inclusions were detected in rolled rod. During the continuous casting, CaO-Al2O3-(MgO) type inclusions in molten steel fully or partially transformed into MgO-Al2O3-CaS. The MgO and CaS content in inclusions increased while the CaO and Al2O3 content decreased during the transformation. Details of inclusion transformation were illustrated by thermodynamic calculations.
引用
收藏
页码：1217 / 1225
页数：9
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