Introduction of Compressive Residual Stress by Means of Cavitation Peening into a Titanium Alloy Rod Used for Spinal Implants


The introduction of compressive residual stress is an effective way to reduce fretting fatigue and fretting wear between a spinal implant rod and its holding fixture. The objective of this paper is to demonstrate that cavitation peening can introduce compressive residual stress into the surface of a spinal implant rod manufactured from medical grade titanium alloy Ti-6Al-4V, which has already been processed by glass shot peening. In order to apply the cavitation peening for the small rod, whose diameter is only 5.5 mm, the cavitating region was concentrated by increasing the ambient pressure. The depth profiles of the resulting residual stress were evaluated by X-ray diffraction following layer removal by electropolishing. The results show that cavitation peening creates compressive residual stress deeper into the rod, even though the stress value at the near surface is saturated due to initial processing using glass shot peening. The depth of the compressive residual stress continuously increases from 44 μm to 230 μm with an increase in the cavitation peening processing time. In addition, the full width at half maximum value of the X-ray diffraction profile, which is closely related to the micro-strain, decreases by up to 32% following the application of cavitation peening.

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O. Takakuwa, A. Gill, G. Ramakrishnan, S. Mannava, V. Vasudevan and H. Soyama, "Introduction of Compressive Residual Stress by Means of Cavitation Peening into a Titanium Alloy Rod Used for Spinal Implants," Materials Sciences and Applications, Vol. 4 No. 7B, 2013, pp. 23-28. doi: 10.4236/msa.2013.47A2004.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] S. R. Mannava, S. Bhamare, V. Chaswal, L. Felon, D. Kirschman, D. Lahrman, R. Tenaglia, D. Qian and V. K. Vasudevan, “Application of Laser Shock Peening for Spinal Implant Rods,” International Journal of Structural Integrity, Vol. 2, No. 1, 2011, pp. 101-113. doi:10.1108/17579861111108653
[2] Y. Sano, K. Akita, K. Masaki, Y. Ochi, I. Altenberger and B. Scholtes, “Laser Peening without Coating as a Surface Enhancement Technology,” Journal of Laser Micro Nanoengineering, Vol. 1, No. 3, 2006, pp. 161-166. doi:10.2961/jlmn.2006.03.0002
[3] H. Soyama and Y. Sekine, “Sustainable Surface Modification Using Cavitation Impact for Enhancing Fatigue Strength Demonstrated by a Power Circulating-Type Gear Tester,” International Journal of Sustainable Engineering, Vol. 3, No. 1, 2010, pp. 25-32. doi:10.1080/19397030903395174
[4] A. Naito, O. Takakuwa and H. Soyama, “Development of Peening Technique Using Recirculating Shot Accelerated by Water Jet,” Materials Science and Technology, Vol. 28, No. 2, 2012, pp. 234-238. doi:10.1179/1743284711Y.0000000027
[5] Y. Sano, M. Obata, T. Kubo, N. Mukai, M. Yoda, K. Masaki and Y. Ochi, “Retardation of Crack Initiation and Growth in Austenitic Stainless Steels by Laser Peening without Protective Coating,” Materials Science and Engineering A, Vol. 417, No. 1-2, 2006, pp. 334-340. doi:10.1016/j.msea.2005.11.017
[6] O. Takakuwa, M. Nishikawa and H. Soyama, “Numerical Simulation of the Effects of Residual Stress on the Concentration of Hydrogen around a Crack Tip,” Surface and Coatings Technology, Vol. 206, No. 11-12, 2012, pp. 2892-2898. doi:10.1016/j.surfcoat.2011.12.018
[7] O. Takakuwa and H. Soyama, “Suppression of HydrogenAssisted Fatigue Crack Growth in Austenitic Stainless Steel by Cavitation Peening,” International Journal of Hydrogen Energy, Vol. 37, No. 6, 2012, pp. 5268-5276. doi:10.1016/j.ijhydene.2011.12.035
[8] O. Takakuwa and H. Soyama, “Using an Indentation Test to Evaluate the Effect of Cavitation Peening on the Invasion of the Surface of Austenitic Stainless Steel by Hydrogen,” Surface and Coatings Technology, Vol. 206, No. 18, 2012, pp. 3747-3750. doi:10.1016/j.surfcoat.2012.03.027
[9] Y. Fu, N. L. Loh, A. W. Batchelor, D. Liu, X. Zhu, J. He and K. Xu, “Improvement in Fretting Wear and Fatigue Resistance of Ti-6Al-4V by Application of Several Surface Treatments and Coatings,” Surface and Coatings Technology, Vol. 106, No. 2-3, 1998, pp. 193-197. doi:10.1016/S0257-8972(98)00528-3
[10] D. Liu, B. Tang, X. Zhu, H. Chen, J. He and J. P. Celis, “Improvement of the Fretting Fatigue and Fretting Wear of Ti-6Al-4V by Duplex Surface Modification,” Surface and Coatings Technology, Vol. 116-119, 1999, pp. 234-238. doi:10.1016/S0257-8972(99)00279-0
[11] V. Fridrici and P. Kapsa, “Effect of Shot Peening on the Fretting Wear of Ti-6Al-4V,” Wear, Vol. 250, No. 1-12, 2001, pp. 642-649.
[12] S. A. Kumar, R. Sundar, G. S. Raman, H. Kumar, R. Gnanamoorthy, R. Kaul, K. Ranganathan, S. M. Oak and L. M. Kukreja, “Fretting Wear Behavior of Laser Peened Ti-6Al-4V,” Tribology Transactions, Vol. 55, No. 5, 2012, pp. 615-623. doi:10.1080/10402004.2012.686087
[13] H. Soyama, D. O. Macodiyo and S. Mall, “Compressive Residual Stress into Titanium Alloy Using Cavitation Shotless Peening,” Tribology Letters, Vol. 17, No. 3, 2004, pp. 501-504. doi:10.1023/B:TRIL.0000044497.45014.f2
[14] H. Soyama, T. Kusaka and M. Saka, “Peening by the Use of Cavitation Impacts for the Improvement of Fatigue Strength,” Journal of Materials Science Letters, Vol. 20, No. 13, 2001, pp. 1263-1265. doi:10.1023/A:1010947528358
[15] H. Soyama, “Enhancing the Aggressive Intensity of a Cavitating Jet by Means of Nozzle Outlet Geometry,” Transactions of ASME, Journal of Fluids Engineering, Vol. 133, No. 10, 2011, Article ID: 101301-1-11. doi:10.1115/1.4004905
[16] ASTM Designation G134-95, “Standard Test Method for Erosion of Solid Materials by a Cavitating Liquid Jet,” Annual Book of ASTM Standards, Vol. 3, 2006, pp. 559-571.
[17] C. E. Brennen, “Cavitation and Bubble Dynamics,” Oxford University Press, Oxford, 1995.
[18] SAEJ784a, “Society of Automotive Engineers,” 1972.
[19] H. Soyama, T. Kikuchi, M. Nishikawa and O. Takakuwa, “Introduction of Compressive Residual Stress into Stainless Steel by Employing a Cavitating Jet in Air,” Surface and Coatings Technology, Vol. 205, No. 10, 2011, pp. 3167-3174. doi:10.1016/j.surfcoat.2010.11.031
[20] H. Soyama and N. Yamada, “Relieving Micro-Strain by Introducing Macro-Strain in a Polycrystalline Metal Surface by Cavitation Shotless Peening,” Materials Letters, Vol. 62, No. 20, 2008, pp. 3564-3566. doi:10.1016/j.matlet.2008.03.055
[21] I. Ostrovskii, N. Ostrovskaya, O. Korotchenkov and J. Reidy, “Radiation Defects Manipulation by Ultrasound in Ionic Crystals,” IEEE Transactions on Nuclear Science, Vol. 52, No. 6, 2005, pp. 3068-3073. doi:10.1109/TNS.2005.861476

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