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Movement of Dislocations in the Sub-Surface of a Polycrystalline Metal by Cavitation Peening Observed by Transmission Electron Microscopy

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ABSTRACT
The impact produced when cavitation bubbles collapse can be utilized to modify surfaces in the same way as shot peening and it is called cavitation peening (CP). CP is one of a number of surface modification techniques used to improve the fatigue strength of metallic materials by introducing compressive residual stress. Although it has been shown by an X-ray diffraction method that CP decreases the micro-strain related to dislocations in the sub-surface of a polycrystalline material, the mechanism for this decrease is unclear. In this paper, the movement of dislocations by CP was observed using transmission electron microscopy (TEM).
 
Cite this paper
Takakuwa, O. , Chiba, A. and Soyama, H. (2015) Movement of Dislocations in the Sub-Surface of a Polycrystalline Metal by Cavitation Peening Observed by Transmission Electron Microscopy. Materials Sciences and Applications, 6, 140-144. doi: 10.4236/msa.2015.62017.
 
References
[1]Soyama, H., Saito, K. and Saka, M. (2002) Improvement of Fatigue Strength of Aluminum Alloy by Cavitation Shotless Peening. Journal of Engineering Materials and Technology, 124, 135-139.
http://dx.doi.org/10.1115/1.1447926
 
[2]Macodiyo, D.O. and Soyama, H. (2003) Cavitation Shotless Peening for Improvement of Fatigue Strength of Carbonized Steel. International Journal of Fatigue, 25, 1217-1222.
http://dx.doi.org/10.1016/S0142-1123(03)00121-X
 
[3]Soyama, H. and Macodiyo, D.O. (2005) Fatigue Strength Improvement of Gears Using Cavitation Shotless Peening. Tribology Letters, 18, 181-184.
http://dx.doi.org/10.1007/s11249-004-1774-7
 
[4]Soyama, H., Kikuchi, T., Nishikawa, M. and Takakuwa, O. (2010) Introduction of Compressive Residual Stress into Stainless Steel by Employing a Cavitating Jet in Air. Surface and Coatings Technology, 205, 3167-3174.
http://dx.doi.org/10.1016/j.surfcoat.2010.11.031
 
[5]Soyama, H. (2014) The Use of Cavitation Peening to Increase the Fatigue Strength of Duralumin Plates Containing Fastener Holes. Materials Sciences and Applications, 5, 430-440.
http://dx.doi.org/10.4236/msa.2014.56047
 
[6]Soyama, H. and Yamada, N. (2008) Relieving Micro-Strain by Introducing Macro-Strain in a Polycrystalline Metal Surface by Cavitation Shotless Peening. Materials Letters, 62, 3564-3566.
http://dx.doi.org/10.1016/j.matlet.2008.03.055
 
[7]Ryan, N.D. and Mcqueen, H.J. (1986) Dynamic Recovery and Strain Hardening in the Hot Deformation of Type 317 Stainless Steel. Materials Science and Engineering, 81, 259-272.
http://dx.doi.org/10.1016/0025-5416(86)90267-3
 
[8]Kim, S.I. and Yoo, Y.C. (2001) Dynamic Recrystallization Behavior of AISI 304 Stainless Steel. Materials Science and Engineering A, 311, 108-113.
http://dx.doi.org/10.1016/S0921-5093(01)00917-0
 
[9]Belyakov, A., Kimura, Y. and Tsuzaki, K. (2005) Recovery and Recrystallization in Ferritic Stainless Steel after Large Strain Deformation. Materials Science and Engineering A, 403, 249-259.
http://dx.doi.org/10.1016/j.msea.2005.05.057
 
[10]Beck, P.A. (1954) Annealing of Cold Works Metals. Advances in Physics, 3, 245-324.
http://dx.doi.org/10.1080/00018735400101203
 
[11]Ostrovskii, I., Ostrovskaya, N., Korotchenkov, O. and Reidy, J. (2005) Radiation Defects Manipulation by Ultrasound in Ionic Crystals. IEEE Transactions on Nuclear Science, 52, 3068-3073.
http://dx.doi.org/10.1109/TNS.2005.861476
 
[12]Soyama, H., Takano, Y. and Ishimoto, M. (2000) Peening of Forging Die by Cavitation. Technical Review of Forging Technology, 25, 53-57.                                                                           eww150203lx
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