Interphase Strain Gradients in Multilayered Steel Composite from Microdiffraction
Interphase Strain Gradients in Multilayered Steel Composite from Microdiffraction
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DOI：
10.1007/s11661-013-2100-5
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发表时间：
2014-01-01
影响因子：
2.8
通讯作者：
Feng, Zhili
中科院分区：
文献类型：
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作者：
Barabash, Rozaliya I.;Barabash, Oleg M.;Feng, Zhili
成功地制备了由马氏体层和奥氏体层交替排列的具有高强度和塑性的多层钢复合材料。为了了解导致这种特殊力学行为的微塑性机制，采用亚微米束尺寸的三维X射线显微镜来研究在增量拉伸加载过程中最上面两层的应力/应变分布。在马氏体/奥氏体界面处原位监测了随载荷水平变化的三维应变梯度随深度的变化。在加载过程中观察到应变梯度的重新分布。马氏体层顶部沿加载方向有较大的压缩应变，而奥氏体层下有较小的拉应变。(C)2013年矿物、金属和材料学会和ASM国际
Multilayered steel composites consisting of alternating martensite and austenite layers and exhibiting a combination of high strength and ductility were successfully fabricated. To understand the microplasticity mechanisms responsible for such exceptional mechanical behavior, 3D X-ray microscopy with a submicron beam size was employed to probe the stress/strain distribution within the top two layers during incremental tensile loading. The 3D depth-dependent strain gradients were monitored in situ near the martensite/austenite interfaces as a function of the load level. It was observed that the strain gradients redistributed during loading. Specifically, large compressive strains developed in the top martensite layer transverse to the loading direction, while small tensile strains were found across the layer interface into the underneath austenite layer. (C) The Minerals, Metals & Materials Society and ASM International 2013