Contribution of interphase precipitation on yield strength in thermomechanically simulated Ti-Nb and Ti-Nb-Mo microalloyed steels

被引：87
作者：
Bu, F. Z. [1 ]
Wang, X. M. [1 ]
Yang, S. W. [1 ]
Shang, C. J. [1 ]
Misra, R. D. K. [2 ]
机构：
[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[2] Univ Louisiana Lafayette, Ctr Struct & Funct Mat, Inst Mat Res & Innovat, Lab Excellence Adv Steel Res, Lafayette, LA 70503 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2015年 / 620卷
关键词：
Continuous cooling; Interphase precipitation; Precipitation hardening; Carbides; NANOMETER-SIZED CARBIDES; LOW-CARBON STEEL; NIOBIUM;
D O I：
10.1016/j.msea.2014.09.111
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The contribution of interphase precipitation on yield strength was studied in Ti-Nb and Ti-Nb-Mo microalloyed steels. The high yield strength is partially attributed to strengthening induced by high degree of interphase precipitation of nanoscale carbides, which are nucleated during continuous cooling. The nanoscale carbides in Ti-Nb-Mo steel were identified as (Ti,Nb,Mo)C crystal structure similar to (Ti,Nb)C in Ti-Nb steel. The interphase precipitation of these carbides with planar or curved boundary, different row spacing and different orientation of the rows in the ferrite grain is related to the mobility of grain boundaries during gamma/alpha transformation based on ledge mechanism. The contribution of interphase precipitation to yield strength was estimated to be similar to 320 MPa and similar to 170 MPa for Ti-Nb-Mo and Ti-Nb steels. The low yield ratio that is important from the perspective of structure application is attributed to the dual phase microstructural consisting of ferrite and bainite. (C) 2014 Elsevier B.V. All rights reserved.
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页码：22 / 29
页数：8
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