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公开(公告)号：US11655512B2
公开(公告)日：2023-05-23
申请号：US17641732
申请日：2019-09-29
发明人： Dianzhong Li , Yikun Luan , Pei Wang , Xiaoqiang Hu , Paixian Fu , Hongwei Liu , Lijun Xia , Chaoyun Yang , Hanghang Liu , Hang Liu , Yiyi Li
CPC分类号： C21C7/0006 , C21C7/10 , C22C33/04 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06
摘要： Provided in the present application are a rare-earth microalloyed steel and a control process. The steel has a special microstructure, and the microstructure comprises a rare earth-rich nanocluster having a diameter of 1-50 nm. The nanocluster has the same crystal structure type as a matrix. The rare earth-rich nanocluster inhibits the segregation of the elements S, P and As on a grain boundary, and obviously improves the fatigue life of the steel. In addition, a rare-earth solid solution also directly affects a phase change dynamics process so that the diffusion-type phase change starting temperature in the steel changes at least to 2° C., and even changes to 40-60° C. in some kinds of steel, thereby greatly improving the mechanical properties thereof, and providing a foundation for the development of more kinds of high-performance steel.
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公开(公告)号：US12091733B2
公开(公告)日：2024-09-17
申请号：US18142152
申请日：2023-05-02
发明人： Dianzhong Li , Yikun Luan , Hongwei Liu , Paixian Fu , Xiaoqiang Hu , Pei Wang , Lijun Xia , Chaoyun Yang , Hanghang Liu , Yang Liu , Peng Liu , Yiyi Li
CPC分类号： C22C38/005 , C21C7/0006 , C21C7/04 , C21C7/06 , C22C33/04 , C22C38/004
摘要： A control process of inclusions in ultra-clean rare earth steel, wherein the content of rare earth elements REM in the ultra-clean rare earth steel, the total oxygen content T[O]m, the total sulfur content T[S]m in the steel, and the total oxygen content T[O]r in a rare earth metal or alloy added to the steel are controlled to satisfy the following formula: −500
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