Gradient residual strain and stress distributions in a high pressure torsion deformed iron disk revealed by high energy X-ray diffraction
Gradient residual strain and stress distributions in a high pressure torsion deformed iron disk revealed by high energy X-ray diffraction
复制标题
高能 X 射线衍射揭示高压扭转变形铁盘中的梯度残余应变和应力分布
DOI：
10.1016/j.scriptamat.2017.11.037
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发表时间：
2018
影响因子：
6
通讯作者：
A. Hohenwarter
中科院分区：
文献类型：
--
作者：
J. Todt;J. Keckes;G. Winter;P. Staron;A. Hohenwarter
利用高能X射线衍射首次研究了直径为30 mm、厚度为8 mm的高压扭转（HPT）变形铁盘内部的残余X射线弹性应力分布。在实验中，一个专用的锥形狭缝系统将衍射规的三维体积限制在~ 0.45 mm 3，然后用于以非侵入性方式扫描大体积样品的横截面。沿着径向和切向方向观察到明显的残余应力梯度，最大拉伸应力约为200 MPa，并与HPT产生的变形梯度相关。
High energy X-ray diffraction is used to investigate for the first time the distribution of residual X-ray elastic stresses inside a high pressure torsion (HPT) deformed iron disk with a diameter and thickness of ~ 30 and ~ 8 mm, respectively. In the experiment, a dedicated conical slit system restricts the diffraction gauge volume in three dimensions to ~ 0.45 mm3, which is then used to scan the bulk sample cross-section in a non-invasive manner. Pronounced residuals stress gradients with maximal tensile stresses of ~ 200 MPa are observed along radial and tangential directions and are correlated to the deformation gradient arising from HPT.