MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Effects of Fine Particle Bombarding on Surface Characteristics and Fatigue Strength of Commercial Pure Titanium
Tatsuro MoritaHidemasa NakaguchiSyo NodaChuji Kagaya
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2012 Volume 53 Issue 11 Pages 1938-1945

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Abstract

This study investigated the effects of fine particle bombarding (FPB) on the surface characteristics and fatigue strength of commercial pure titanium. For comparison, conventional shot peening (SP) was also performed. The surface microstructure was nano-crystallized by FPB and SP. The grain size of nano-crystals reduced with decreasing particle diameter or increasing air pressure for accelerating particles. The surface hardness and compressive residual stress markedly increased by FPB. The surface layers were uniformly generated along the surface, and effectively suppressed the initiation of fatigue cracks. As a result, the fatigue strength greatly increased. Since the surface layers acted as a barrier to subsurface cracks, its improvement ratio was closely related to the surface characteristics.

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© 2012 The Japan Institute of Metals and Materials
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