Crystallographic and Microstructural Studies of Lath Martensitic Steel During Tensile Deformation

被引:17
|
作者
Na, Hyuntaek [1 ]
Nambu, Shoichi [1 ]
Ojima, Mayumi [1 ]
Inoue, Junya [1 ]
Koseki, Toshihiko [1 ]
机构
[1] Univ Tokyo, Dept Mat Engn, Grad Sch Engn, Bunkyo Ku, Tokyo 1138656, Japan
来源
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2014年 / 45A卷 / 11期
基金
日本科学技术振兴机构;
关键词
SHAPE-MEMORY ALLOYS; MECHANICAL-PROPERTIES; PLASTIC-DEFORMATION; BEHAVIOR; TRANSFORMATION; REFINEMENT; MORPHOLOGY; TEXTURE; STRAIN;
D O I
10.1007/s11661-014-2461-4
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Significant crystallographic refinement was observed in the as-quenched lath martensitic steel during tensile deformation up to a strain of 20 pct. Crystallographic investigation by electron backscattering diffraction analysis coupled with the use of crystal plasticity model confirmed that the activation behavior of slip systems is inhomogeneous even within each martensite block. In particular, the activation behavior of slip systems is initially affected by the initial crystal orientation; however, the effect becomes negligible with increasing deformation. In addition, slip systems parallel to the lath plane are preferentially activated during elongation. Our results indicate that the nonuniform crystal rotation within individual blocks is induced not only by grain interaction phenomena but also by the anisotropic activity of slip systems. These are key factor that determines the grain refinement behavior in the as-quenched lath martensitic steel during deformation.
引用
收藏
页码:5029 / 5043
页数:15
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