Factors Controlling the Fatigue Strength of Nitrided Titanium

Morita, Tatsuro; Takahashi, H.; Shimizu, M.; Kawasaki, Kenji

doi:10.1111/j.1460-2695.1997.tb00404.x

Cited by 63 publications

(18 citation statements)

References 7 publications

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“…Since there are no data given in the scientific literature concerning the fatigue behaviour of nitrided CoCrMo alloy, any sort of comparison could not be made. On the other hand, analogous results are common regarding the Ti-based alloys 20,21. Therefore,…”

supporting

confidence: 59%

Fatigue life determination of plasma nitrided medical grade CoCrMo alloy

Bayrak¹,

Yetim²,

Alsaran³

et al. 2010

Fatigue Fract Eng Mat Struct

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A B S T R A C T In this paper, the fatigue behaviour of plasma nitrided medical grade forged CoCrMo alloy was studied. Since metallic biomaterials are used for implant applications where high and/or cyclic stresses along with corrosive effects of human body are of concern, enhancing mechanical and surface properties of implant alloys is crucial. Plasma nitriding was implemented at three different temperatures as 600, 700 and 800 • C for time intervals of 1 and 4 h. S-N curves of untreated and nitrided specimens were obtained via axial tension compression fatigue tests. It was found that plasma nitriding treatment reduces the fatigue resistance of forged CoCrMo alloy by the ratios of 7-23% depending on the surface roughness, phase structure and hardness of the modified layer which are determined by the treatment parameters.

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supporting

confidence: 59%

Fatigue life determination of plasma nitrided medical grade CoCrMo alloy

Bayrak¹,

Yetim²,

Alsaran³

et al. 2010

Fatigue Fract Eng Mat Struct

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show abstract

“…Titanium possesses inherent advantages such as high specific strength and excellent corrosion resistance. To further improve the performance of titanium, the authors studied a variety of surface modifications, such as nitriding, 12,13) DLC (diamond-like carbon) coatings, 14) and hybrid surface modification composed of plasma treatments and FPB. 1517) Recently, the combination effects of short heat treatment and FPB on the fatigue strength of Ti6Al4V alloy were investigated.…”

Section: Introductionmentioning

confidence: 99%

Effects of Fine Particle Bombarding on Surface Characteristics and Fatigue Strength of Commercial Pure Titanium

et al. 2012

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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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“…The reduction in plain fatigue strength of titanium alloys nitrided at higher temperatures of around 850°C has been attributed to the grain growth during nitriding and the formation of a compound layer possessing low fracture strength [12,13]. One proposal for overcoming this problem is to perform the nitriding process at relatively lower temperatures (less than 600°C) [11,13]. To date, however, only a limited amount of work has been performed on low-temperature plasma-nitrided Ti-6Al-4V [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Plasma Nitriding Environment and Time on Plain Fatigue and Fretting Fatigue Behavior of Ti–6Al–4V

Ali

Raman

2010

Tribol Lett

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Plasma nitriding was performed on Ti-6Al-4V fatigue test samples at 520°C in two environments (nitrogen and nitrogen-hydrogen mixture in a ratio of 3:1) for two time periods (4 and 18 h). Plain fatigue and fretting fatigue tests were conducted on unnitrided and plasma nitrided samples. Plasma nitriding degraded lives under both plain fatigue and fretting fatigue loadings. The samples nitrided in nitrogen exhibited superior lives compared with the samples nitrided in the nitrogen-hydrogen mixture, possibly due to the relatively higher hardness (and presumably lower toughness) of the nitrided layer of the samples nitrided in the nitrogen-hydrogen mixture environment. For those samples nitrided in the nitrogen-hydrogen mixture, those nitrided for 18 h exhibited superior lives compared with those nitrided for 4 h. This trend was observed for samples nitrided in nitrogen gas at lower stress levels only; the converse was true at higher stress levels of 550 MPa and 700 MPa under plain fatigue loading. However, under fretting fatigue loading, the plasma nitriding time did not influence the lives significantly.

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Factors Controlling the Fatigue Strength of Nitrided Titanium

Cited by 63 publications

References 7 publications

Fatigue life determination of plasma nitrided medical grade CoCrMo alloy

Fatigue life determination of plasma nitrided medical grade CoCrMo alloy

Effects of Fine Particle Bombarding on Surface Characteristics and Fatigue Strength of Commercial Pure Titanium

Effect of Plasma Nitriding Environment and Time on Plain Fatigue and Fretting Fatigue Behavior of Ti–6Al–4V

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