公开(公告)号：US20220307097A1

公开(公告)日：2022-09-29

申请号：US17641732

申请日：2019-09-29

Applicant: INSTITUTE OF METAL RESEARCH CHINESE ACADEMY OF SCIENCES

Inventor： Dianzhong LI ,  Yikun LUAN ,  Pei WANG ,  Xiaoqiang HU ,  Paixian FU ,  Hongwei LIU ,  Lijun XIA ,  Chaoyun YANG ,  Hanghang LIU ,  Hang LIU ,  Yiyi LI

IPC: C21C7/00 ,  C21C7/10 ,  C22C33/04 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

Abstract: 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.