Ordering-disordering phenomena and micro-hardness characteristics of B2 phase in Fe-(5-6.5%)Si alloys

被引:126
作者
Shin, JS [1 ]
Bae, JS
Kim, HJ
Lee, HM
Lee, TD
Lavernia, EJ
Lee, ZH
机构
[1] Korea Inst Ind Technol, Ctr Adv Mat, Inchon 406130, South Korea
[2] Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South Korea
[3] Univ Calif Irvine, Dept Chem & Biochem Engn & Mat, Irvine, CA 92697 USA
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2005年 / 407卷 / 1-2期
关键词
silicon steel; order-disorder phenomena; segregation; micro-hardness; electrical resistivity;
D O I
10.1016/j.msea.2005.07.012
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The disappearing and forming behavior of B2 ordered phase in high Si steels with Si-levels between 5 and 6.5% (by weight, unless specified otherwise) was investigated by observing TEM and measuring electrical resistivity and micro- and nano-hardness. The critical cooling rate for suppressing the formation of 132 ordered phase increased exponentially with Si-content. The ordered phase coarsening was observed to occur actively above 800 degrees C, where atoms have enough mobility. The removal of solidification segregation is necessary in order to reduce the amount of B2 ordered phase in the as-cast or hot-rolled state, to lower the annealing temperature for the dissolution of B2 ordered phase, and to shorten the annealing time. Micro-Vickers hardness depended only on Si-content even under various heat treatment conditions, and the nano-hardness had a small difference between B2 and A2 phases. In the high Si steels, the short-range order in A2 disordered phase was likely to cause a comparable hardness as that of B2 ordered phase. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:282 / 290
页数:9
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