Fatigue strength and cyclic crack resistance of titanium alloy VT3-1 in different structural states. Communication 1. Study procedure and experimental results

Troshchenko, V. T.; Gryaznov, B. A.; Nalimov, Yu. S.; Gerasimchuk, O. N.; Ивасишин, О. М.; Markovskii, P. E.

doi:10.1007/bf02208494

Cited by 15 publications

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“…Thus, previously [8] it was found that for a two-phase titanium VT3-1 alloy, with the sizes of the structural element responsible for the fatigue strength being d 7 10 a = mm (a globular microstructure) and d 1 0 4 a = . mm (a lamellar microstructure), the value of l 0 (1) was equal to 64 and 2.2 mm, respectively (see Table 1, where numbers 1 and 7 correspond to the numbers of the microstructures).…”

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confidence: 95%

“…The fatigue test results are given in Fig. 2, and their detailed analysis made earlier [7,8]. Development of the Model for Predicting the Fatigue Limit.…”

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confidence: 99%

“…The object of the experimental investigation was a two-phase ( ) a b + titanium VT3-1 alloy [7,8] that was studied in the form of an initial bar and billets after different modes of thermomechanical treatment. The starting bars were subjected to preliminary quenching (1323 K, holding in a furnace for 0.5 h), in order to attain the dispersed a-state and to eliminate the texture formed during the manufacture of bars.…”

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“…The fatigue tests were performed under normal conditions on smooth specimens with a working section of 5 5 mm in the plane cantilever bending at fully-reversed cyclic loading using an electrodynamic vibration-testing machine according to the procedures described in detail in [7,8]. The 1% drop in the resonant frequency of the specimen vibrations that corresponds to the formation of a semi-elliptical surface crack of a depth of about 10% of the specimen section thickness was considered as the fatigue fracture criterion.…”

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A generalized grain-size dependence of the fatigue limit

Herasymchuk

2011

Strength Mater

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A generalized model is developed for calculating the fatigue limit of the material based on the data on its microstructure. The experimental results of fatigue and cyclic fracture toughness tests and the data on the analysis of the microstructure of two-phase (a b + ) titanium VT3-1 alloy with a different microstructure (globular, bimodal and fine lamellar microstructure) have shown that the dependence of the fatigue limit on the structural parameter, which is responsible for the material fatigue strength, has a nonlinear S-like nature. The formula for calculating the fatigue limit is justified by the data on the microstructural parameters and by the results of static tensile tests of the material, with a fair agreement obtained between the calculated and experimental results. The model has been validated for materials with another type of the crystal lattice [steel containing 0.16% C with a body-centered cubic lattice (bcc) and brass 70/30 with a face-centered cubic lattice (fcc)] and has shown a satisfactory agreement between the experimental and calculation results.Introduction. In view of the current widespread use of advanced structural materials in mechanical engineering and also the extension of the notion about the ultimate potential of traditionally used alloys due to the optimization of their processing, the need to determine the characteristics of resistance to fatigue fracture increases dramatically. It should be noted that the traditional correlation relationships that connect the characteristics of cyclic strength with those of static strength and microstructure cannot be used for novel advanced materials and new processes for manufacturing components as being untested and such that do not provide the desired accuracy for determining the fatigue strength characteristics. The carrying out of experimental studies on the fatigue strength characteristics of new alloys in order to optimize their manufacturing process with the methods specified in current standards results in extremely high consumption of material resources and time. In many cases, an important point is that the required data on the material strength under cyclic loading are to be obtained in the shortest possible time (for instance, to verify the correctness of the engineering design or technology decision made), and the data from traditional long-term tests obtained untimely quite often lose their value.One of the most important parameters of the material microstructure which is currently associated with the fatigue limit is the grain size, d. Already the pioneering studies on the effect of the grain size on the fatigue fracture resistance started as early as the 30s of the last century have revealed that the fatigue limit increases with a decrease in the grain size. However, in a number of papers it was noted that a finer microstructure does not necessarily result in the lifetime change. The linear relationship between the yield stress and the parameter of microstructure 1 d derived in [1, 2] and a similar relationship for the fatigue ...

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confidence: 95%

“…The fatigue test results are given in Fig. 2, and their detailed analysis made earlier [7,8]. Development of the Model for Predicting the Fatigue Limit.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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A generalized grain-size dependence of the fatigue limit

Herasymchuk

2011

Strength Mater

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“…The fatigue strength characteristics were studied experimentally according to the procedure described in detail in [5]. Flat cantilever specimens with a working cross section of 1 mm in thickness and 5 mm in width were tested in lateral bending using a VÉDS-400A type electrodynamic vibrator under resonant transverse vibration condition.…”

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Fatigue strength of an (α + β)-type titanium alloy Ti-6Al-4V produced by the electron-beam physical vapor deposition method

et al. 2006

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The fatigue test results are presented for an (α β + )-type titanium alloy in the form of two-layered smooth specimens (the first layer is a condensate prepared by the electron-beam physical vapor deposition method, the second one is a substrate from a standard sheet material of the same type) and condensate specimens. It has been found that the presence in the condensate of deposition defects such as droplets lowers the fatigue limit of the material by approximately 1.5 times as compared to that of the condensate which is free of defects. It is shown that in the absence of droplets, the fatigue limit of the condensate is no lower than that of the substrate material. The microstructure, texture and fracture surfaces of the materials under study are analyzed, on the basis of which the fatigue limits of the defectless condensate and substrate material are calculated using approaches of linear fracture mechanics. Good agreement has been obtained between calculated and experimental data.

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