Effect of Combined Shot Peening Process for Surface Nanocrystallization Method on Fatigue Strength of TC4

Ai Ling Wen; Sheng Wu Wang; Rui Ming Ren; Xiu Xia Yan

doi:10.4028/www.scientific.net/AMR.97-101.2217

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 97-101Effect of Combined Shot Peening Process for...

Effect of Combined Shot Peening Process for Surface Nanocrystallization Method on Fatigue Strength of TC4

Abstract:

In order to enhance the fatigue limit of titanium (TC4), the combined shot peening were employed. Firstly, nano-crystallization in surface layer of TC4 were carried out by high-energy shot peening, and then the surface repair shot peening with small balls were introduced for repairing the surface damage by high-energy shot peening, and reducing the surface roughness, thus to enhance the quality of nanocrystalline surface layer of TC4. The fatigue tests were performed using the specimens treated by the combined shot peening. In addition, the influence factors of fatigue limit, the behavior of fatigue crack initiation and propagation etc. are discussed. The results showed that the fatigue limit of TC4 specimen treated by high-energy shot peening is increased by 13%, while the fatigue limit of TC4 specimen treated by the compound shot peening process is increased by 34% (165MPa). The main reason of fatigue improvement is considered to be that the combined shot peening process may effectively repair the surface damage, and also there is the certain relationship between the fatigue limit improvement and the surface roughness reducing.

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Periodical:

Advanced Materials Research (Volumes 97-101)

Pages:

2217-2220

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.97-101.2217

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Online since:

March 2010

Authors:

Ai Ling Wen, Sheng Wu Wang, Rui Ming Ren, Xiu Xia Yan

Keywords:

Combined Shot Peening, Fatigue Limit, Nanocrystallisation, Titanium Alloy

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