The Effect of High Vacuum Environment on Tensile Fatigue Properties of Ti-6Al-4V Alloy.

孝, 中村; 真, 金子; 志郎, 風見; 徹, 野口

doi:10.2472/jsms.49.1148

Cited by 14 publications

(5 citation statements)

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“…T. Nakamura et al [40] had performed fatigue tests on titanium alloy(Ti-6Al-4V) in room atmosphere and in high vacuum. S-N diagram obtained is shown in Fig.19, in which the fatigue life in the vacuum is clearly longer than that in room atmosphere at higher stress levels of 860 > σ MPa, but no difference is found on the fatigue life at lower stress levels of 860 < σ MPa, where the internal fracture takes place.…”

Section: Effects Of Environmentsmentioning

confidence: 99%

Review and Prospects for Current Studies on Very High Cycle Fatigue of Metallic Materials for Machine Structural Use

Sakai

2009

JMMP

265

194

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In recent years, mechanical structures such as railway wheels, rails, offshore structures, bridges, engine components, load bearing parts of automobiles, etc. have to endure for a long term up to 10 8-10 10 loading cycles in order to save resources and to reduce the cost together with the environmental load to the globe. Thus, the fatigue behavior of structural materials in the very high cycle regime of 10 8-10 10 cycles has become an important subject of the research. In this paper, a review of the current studies in this area performed by many researchers is described in order to provide a certain milestone in the history of the research on fatigue behavior of the metallic materials in the very high cycle regime.

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Section: Effects Of Environmentsmentioning

confidence: 99%

Review and Prospects for Current Studies on Very High Cycle Fatigue of Metallic Materials for Machine Structural Use

Sakai

2009

JMMP

265

194

View full text Add to dashboard Cite

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“…A previous study showed that as for steel, fatigue life is longer in vacuum condition than in air and that the fracture surface is rougher in air [ 17 ]. In addition, it was found that an air environment can accelerate crack propagation but does not change the fracture mode [ 18 , 19 , 20 , 21 ]. Fracture morphologies vary greatly in air and vacuum condition and in a vacuum-loading environment, the fatigue crack propagation rate could be retarded significantly [ 22 , 23 , 24 ].…”

Section: Discussionmentioning

confidence: 99%

Characterization on Crack Initiation and Early Propagation Region of Nickel-Based Alloys in Very High Cycle Fatigue

et al. 2022

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As nickel-based alloys are more and more widely used in engineering fields for bearing cyclic loadings, it is necessary to study their very-high-cycle fatigue (VHCF) properties. In this paper, the fatigue properties of nickel-based alloy 625 were investigated using an ultrasonic fatigue test apparatus. The fracture microscopy shows that around the crack initiation site there are two characteristic zones, a rough area (RA) and a fine granular area (FGA). Inclusions caused the interior fatigue crack initiation, and the coalescence of neighboring micro cracks was strongly influenced by the local microstructure, resulting in the RA morphology. Subsequently, the contact and compressing of the crack surfaces contributed to the formation of the FGA. Finally, the stress intensity factors of the RA and FGA were quantitatively evaluated for further discussion of the crack initiation and propagation processes.

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“…The research shows that the fatigue crack includes the initiation of fatigue crack, the stable propagation of fatigue crack and two stages. The crack initiation stage occupies most of the life of the crack [15] . The equiaxed α phase in titanium alloy can effectively curb the initiation of cracks.…”

Section: Anti-fatigue Mechanism and Performancementioning

confidence: 99%

Application and research of titanium alloy oil drill pipes

Ma,

Zhu,

Zhang

et al. 2023

J. Phys.: Conf. Ser.

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The complex and harsh drilling environment has put forward higher requirements and standards for future drilling tools. Compared with other drill pipes, titanium alloy drill pipe has a series of characteristics such as high specific strength, excellent corrosion resistance, fatigue resistance, and non-magnetic, making it be the first choice of material for oil and gas drilling in unconventional deep well, deep sea and other harsh environments. This paper discussed the design and microstructure properties of titanium alloy drill pipes in terms of alloy composition, service performance as well as pipe body processing and joint connection. Combined with the development of the application and standards of titanium alloy drill pipe, the prospects of the development and application of titanium alloy drill pipe in unconventional drilling operations such as deep wells and ultra-deep wells were foreseen, in order to provide support for promoting the application and development of titanium alloy drill pipe in the oil fields.

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The Effect of High Vacuum Environment on Tensile Fatigue Properties of Ti-6Al-4V Alloy.

Cited by 14 publications

References 0 publications

Review and Prospects for Current Studies on Very High Cycle Fatigue of Metallic Materials for Machine Structural Use

Review and Prospects for Current Studies on Very High Cycle Fatigue of Metallic Materials for Machine Structural Use

Characterization on Crack Initiation and Early Propagation Region of Nickel-Based Alloys in Very High Cycle Fatigue

Application and research of titanium alloy oil drill pipes

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