Evaluation of surface integrity in micro drilling process for nickel-based superalloy

被引:1
作者
Muhammad Imran
Paul T. Mativenga
Ali Gholinia
Philip J. Withers
机构
[1] The University of Manchester,Manufacturing and Laser Processing Research Group, School of Mechanical, Aerospace and Civil Engineering
[2] The University of Manchester,School of Materials
来源
The International Journal of Advanced Manufacturing Technology | 2011年 / 55卷
关键词
Micro drilling; Nickel alloy; Surface integrity; Surface and subsurface deformation;
D O I
暂无
中图分类号
学科分类号
摘要
This study focuses on the mechanical drilling of micro-holes in Inconel 718 alloy under wet cutting conditions. Qualitative and quantitative mechanical and metallurgical characterization of the surface and subsurface region was undertaken using nanoindentation, backscatter electron microscopy, electron backscatter diffraction microscopy and transmission electron microscopy. The analysis revealed three different zones, namely, a highly deformed nanostructured surface layer containing ultra-fine and high aspect ratio grains drawn out by large scale deformation, a deformed subsurface layer and finally the unaffected parent metal. The nano-hardness, plastic deformation, microstructure and crystal misorientation were assessed. The correlation between the modified surface and subsurface layers and the cutting conditions was established. The phenomena behind the formation of the different zones were investigated. The results suggest that subsurface alterations are driven by thermo-mechanical loading, causing plasticity and grain refinement by excessive shearing local to the cut surface.
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页码:465 / 476
页数:11
相关论文
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