Evaluation of Fatigue Strength on Shot Peened Pure Titanium

Author:  Phillip Milidantri, Ryota Mochizuki, Noriyuki Hisamori
Source:  ICSP-13
Doc ID:  2017077
Year of Publication:  2017
Introduction: Ti-6Al-4V has high static strength and superior corrosion resistance, so it is a material that is widely used, not only for aerospace parts and medical instruments but also in areas such as sports equipment. Prof. Masaki and others investigated the fatigue strength of Ti-6Al-4V processed under various shot peening conditions, and it has been confirmed that the fatigue strength is not able to improve the fatigue strength of Ti-6Al-4V that has not been processed with shot peening. [1] Thus, it can be understood that for Ti-6Al-4V materials, the application of shot peening is difficult. On the other hand, pure titanium has low static strength, so there are few instances where it has been used. However, compared to Ti-6Al-4V it has higher productivity and its material price is lower. If, through shot peening, it is possible to obtain fatigue strength that is equal to or better than that of Ti-6Al-4V, it may be possible to increase the use cases of pure titanium. In this study, a plate-bending fatigue test was performed to investigate the effects of various shot peening conditions on the fatigue strength of pure titanium. For comparison, the fatigue strength results for Ti-6Al-4V that were measured in the previous study will also be noted here. [2]

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