X-Ray Diffraction Study on the Strain Anisotropy and Dislocation Structure of Deformed Lath Martensite

被引：0
作者：
S. Hossein Nedjad
F. Hosseini Nasab
M. R. Movaghar Garabagh
S. R. Damadi
M. Nili Ahmadabadi
机构：
[1] Faculty of Materials Engineering,Department of Materials Engineering
[2] Sahand University of Technology,undefined
[3] Faculty of Materials Engineering,undefined
[4] Sahand University of Technology,undefined
[5] Faculty of Engineering,undefined
[6] Tarbiat Modares University,undefined
[7] School of Metallurgy and Materials Engineering,undefined
[8] University of Tehran,undefined
来源：
Metallurgical and Materials Transactions A | 2011年 / 42卷
关键词：
Screw Dislocation; Edge Dislocation; Maraging Steel; Integral Breadth; Line Profile Analysis;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
18Ni (300) maraging steel possessing lath martensite structure was deformed by four passes of equal-channel angular pressing (ECAP) at ambient temperature. Line profile analysis (LPA) of X-ray diffraction (XRD) patterns identified strong strain anisotropy and remarkable increases in the relative fraction of screw dislocations after ECAP. The strain anisotropy was reasonably accounted for by the anisotropy of elastic constants. Domination of screw dislocations in the deformed structure was attributed to the preferred annihilation of edge dislocations in the early stages of deformation along with the difficulties for annihilation of screw dislocations by cross slipping. Cobalt addition was mainly assumed to make cross slipping difficult by reducing stacking-fault energy and favoring short-range ordering.
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页码：2493 / 2497
页数：4
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