Large Plastic Deformation and Ultra-Fine Grained Structures Generated by Machining |
| Journal |
Key Engineering Materials (Volumes 375 - 376) |
| Volume |
Advances in Machining & Manufacturing Technology IX |
| Edited by |
Yingxue Yao, Xipeng Xu and Dunwen Zuo |
| Pages |
21-25 |
| DOI |
10.4028/www.scientific.net/KEM.375-376.21 |
| Online since |
March, 2008 |
| Authors |
Wen Jun Deng,
Wei Xia,
Yong Li,
Zhen Ping Wan,
Yong Tang
|
| Keywords |
Machining, Severe Plastic Deformation (SPD), Ultra-Fine Grain Material |
| Abstract |
Microstructure of machined copper chips at very low velocity was characterized by
transmission electron microscopy. The structure of the machined chip produced by reasonable
combinations of machining parameters is virtually entirely occupied by isolated equiaxed submicron
grains of 100~300nm in size with high-angle boundaries. A finite element model was developed to
study large plastic deformation in plain orthogonal machining copper. The numerical results show
most of the grain refinement associated with the formation of ultra-fine grained chip may be attributed
to the large shear strain imposed in the deformation zone. It is feasible to take machining process as a
method of preparing ultra-fine grained materials. But the optimal design of the machining process
requires a precise and quantitative understanding of the mechanics of deformation-induced subgrain
microstructure. |
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