Strength and Fracture Mechanism of an Ultrafine-Grained Austenitic Steel for Medical Applications

Klevtsov, G. V.; Valiev, Ruslan Z.; Klevtsova, N. A.; Tyurkov, M.N.; Linderov, Mikhail; Abramova, Marina M.; Рааб, А. Г.; Минасов, Т. Б.

doi:10.3390/ma14247739

Cited by 4 publications

(3 citation statements)

References 23 publications

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“…In [ 12 , 13 ], it is shown through the example of Ti and austenitic steel that materials with a UFG structure resist torsional fracture better than initial CG materials. However, bone screws are complex-shaped items with a pronounced stress raiser (thread).…”

Section: Discussionmentioning

confidence: 99%

“…There are a variety of SPD techniques, both well-established ones, such as high-pressure torsion, equal-channel angular pressing (ECAP) and ECAP-Conform [ 5 , 6 ], and new emerging ones (see, e.g., [ 7 , 8 ]). Numerous studies conducted in the past few years provide convincing evidence that the formation of a UFG structure enables increasing considerably the hardness and strength properties of materials during tension and torsion, and increasing the fatigue limit of materials [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. The use of UFG materials that are stronger will enable miniaturizing medical implants without a decline in their mechanical properties under different types of loading.…”

Section: Introductionmentioning

confidence: 99%

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Strength of Products Made of Ultrafine-Grained Titanium for Bone Osteosynthesis

et al. 2022

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This paper evaluates the fatigue strength of ultrafine-grained (UFG) Grade 4 Ti in the low-cycle fatigue region, as well as the strength of medical implants (plates and screws) made of UFG Ti under various types of loading in comparison with the strength of products made of coarse-grained (CG) Ti. To produce a UFG state, titanium billets after annealing were processed by the ECAP-Conform technique. The fatigue of the prismatic specimens with a thickness of 10 mm from CG and UFG Ti was tested by the three-point bending method using an Instron 8802 facility. The modeling and evaluation of the stress-strain state in the ANSYS software package for finite-element analysis revealed, in particular, the localization of equivalent stresses in the area of hole edges and at fillets during the tension of the plates. The performed research has demonstrated that medical implants (plates and screws) from UFG Grade 4 Ti have a higher strength under different types of loading (tension, fatigue strength, torsion) in comparison with products from CG Ti. This opens up a possibility for the miniaturization of medical products from UFG Ti while preserving their main performance properties at an acceptable level.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strength of Products Made of Ultrafine-Grained Titanium for Bone Osteosynthesis

et al. 2022

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“…In addition to tensile testing, materials intended for the manufacture of implants are subjected to other types of loading, both static and dynamic. A positive effect of ECAP processing on the torsion resistance of such materials as titanium, austenitic steel was noted [6,13,15]. However, ECAP processing has an ambiguous effect on other characteristics of materials, such as fatigue strength, impact strength, and static crack resistance.…”

Section: Introductionmentioning

confidence: 99%

Strength and fracture mechanism of a magnesium alloy for medical applications after equal-channel angular pressing

et al. 2022

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In this paper, we study the strength and fracture mechanism of the cast magnesium alloy Mg-Zn-Ca (1.0 % Zn, 0.2 % Ca) for medical applications after equal-channel angular pressing (ECAP) in comparison with the initial condition (after homogenization annealing). Mechanical tests included tensile and torsion tests of samples with a diameter of 3 mm and impact strength tests of samples with a V-shaped stress raiser. The microrelief of all fractures was studied in a Phenom ProX G6 scanning electron microscope (SEM). The results of tensile testing of the samples showed that the strength of the alloy after ECAP increased by a factor of 1.5 -1.8, and the elongation increased by a factor 2.6. The torsional strength of the alloy increased by a factor 1.1-1.3, and the relative shear of the alloy decreased by factor a 1.3 as compared with the alloy after annealing. In contrast to static loads, the magnesium alloy Mg-Zn-Са after ECAP is poorly resisting one-time impact loads. Analysis of the results of this study allows us to conclude that the magnesium alloy Mg-Zn-Ca after ECAP is more promising for the manufacture of medical products that experience static loads during operation, as compared with the alloy after annealing.

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Strength and fracture mechanism of nanostructured metal materials for medical applications

Klevtsov

Valiev

Fesenyuk³

et al. 2022

Lett. Mater.

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In this paper we study titanium Grade4, magnesium alloy Mg-Zn-Ca, corrosion-resistant austenitic steel 08Kh18N9 for medical applications. The mechanical properties in tension, torsional strength, and cyclic crack resistance under different types of loading of steels are investigated. The results are compared for two states of steels: the initial coarse-grained (CG) state and ultrafine-grained (UFG) state produced by severe plastic deformation processing via equal-cannel angular pressing (ECAP). It is demonstrated that the ultrafine-grained materials have essentially better strength and lower sensitivity to cyclic overloads. It is concluded that all the studied UFG materials are more promising compared to CG ones for the manufacture of medical devices for various purposes, which experience various static and cyclic loads during operation.

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Strength and Fracture Mechanism of an Ultrafine-Grained Austenitic Steel for Medical Applications

Cited by 4 publications

References 23 publications

Strength of Products Made of Ultrafine-Grained Titanium for Bone Osteosynthesis

Strength of Products Made of Ultrafine-Grained Titanium for Bone Osteosynthesis

Strength and fracture mechanism of a magnesium alloy for medical applications after equal-channel angular pressing

Strength and fracture mechanism of nanostructured metal materials for medical applications

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