Design of ultrafine eutectic-dendrite composites with enhanced mechanical properties in Fe-based alloy

被引：11
作者：
Kim, T. E. [1 ]
Sohn, S. W. [1 ]
Park, J. M. [1 ,2 ]
Bang, C. W. [1 ]
Kim, W. T. [3 ]
Kim, D. H. [1 ]
机构：
[1] Yonsei Univ, Dept Met Engn, Ctr Noncrystalline Mat, Seoul 120749, South Korea
[2] IFW Dresden, Inst Complex Mat, D-01171 Dresden, Germany
[3] Cheongju Univ, IT Div, Cheongju 360764, South Korea
来源：
METALS AND MATERIALS INTERNATIONAL | 2013年 / 19卷 / 04期
关键词：
composites; deformation; phase transformation; compression test; transmission electron microscopy; plasticity; METALLIC-GLASS COMPOSITES; HIGH-STRENGTH; MARTENSITIC-TRANSFORMATION; PLASTICITY; DUCTILITY; SYSTEM; STEELS; SCALE; GAMMA;
D O I：
10.1007/s12540-013-4005-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of Mn content on the evolution of microstructure and the enhancement of mechanical properties in Fe-Nb-Mn hierarchical composites consisted of ultrafine eutectic and primary dendrite has been studied by using X-ray diffractometry, scanning electron microscopy, transmission electron microcopy and compression test. Fe-11Nb-5Mn hierarchical composite consisted of alpha'-Fe dendrite and urtrafine alpha'-Fe + Fe2Nb eutectic, and exhibited a reasonably good combination of mechanical properties, i.e. yield strength of 1283 +/- 10 MPa and compressive plastic strain of 7.75 +/- 5%, while Fe-11Nb-15Mn composite consisted of E >-Fe dendrite and E >-Fe + Fe2Nb eutectic structure with some retained gamma phase, and exhibited a far better combination of mechanical properties, i.e. higher yield strength of 1462 +/- 10 MPa and larger compressive plastic strain of 11.28 +/- 2%. The origin for the simultaneous enhancement of high strength and large plastic strain is attributed to E >-Fe martensite formation and strain-induced martensitic transformation from E > to alpha' during deformation.
引用
收藏
页码：667 / 671
页数：5
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