Relation between the fracture laws and the fatigue life of a surface-hardened pseudo-α titanium alloy

Bagmutov, V. P.; Vodop'yanov, V. I.; Zakharov, I. N.; Denisevich, D. S.

doi:10.1134/s0036029516070053

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…EMT consisted (Figure 1) of exposing alternating current of high density j (300 A/mm 2 and 600 A/mm 2 ) and of low voltage U (1.5-2 V) to the material. The current passed through the local contact zone of the tool with the surface of the sample [23][24][25]. The tool and the treated surface were cooled with water.…”

Section: Methodsmentioning

confidence: 99%

“…The authors in [21,22] established that the combination of oxidation with ultrasonic hardening increased the depth and hardness of the modified layer. The authors in [23][24][25] showed the capabilities of combined electromechanical and ultrasonic treatment to increase the static and cyclic strength of pseudo-α and α + β titanium alloys by creating a hardened layer on the surface and by forming compressive residual stress.…”

Section: Introductionmentioning

confidence: 99%

“…In papers [23,24], the structure and mechanical behavior of titanium pseudo-α alloy were explored after various combined treatments. It was shown that the hardening of alloys with reduced content of the β-phase during high-speed electro-thermal-mechanical influences occurred mainly in the deformation mechanism.…”

Section: Introductionmentioning

confidence: 99%

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Features of Changes in the Surface Structure and Phase Composition of the of α + β Titanium Alloy after Electromechanical and Thermal Treatment

Bagmutov

Vodop'yanov

Zakharov

et al. 2022

Metals

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Changes of structure, phase composition and microhardness in high-strength α + β titanium alloy were investigated after electromechanical treatment (EMT) and subsequent aging. The EMT was performed with alternating current density (j of 300 and 600 A/mm2). The aging was performed upon heating at 600 °C and exposure for 14 h. Methods of scanning electron microscopy, X-ray phase structure, micro X-ray spectral and durometric analyses were used. Modified layers (up to 200–250 µm in depth) on the surface of α + β titanium alloy were formed due to intensive thermo-deformation during the EMT and the following aging. The structure of the surface layer was characterized by high dispersivity (with particle sizes of about 30–500 nm), significant concentration heterogeneity (due to redistribution of the alloying elements and changes in the volume ratio of α- and β-phases), distortions in the crystal structure, increased levels of microstrain and microstress (2–2.5 times as compared to the initial) and increases in microhardness (by 30–40%).

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Features of Changes in the Surface Structure and Phase Composition of the of α + β Titanium Alloy after Electromechanical and Thermal Treatment

Bagmutov

Vodop'yanov

Zakharov

et al. 2022

Metals

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“…Основное внимание уделяли исследованиям структуры [15,17,19,25,26], глубины, твердости и других параметров упрочненного слоя [15 - 18, 21, 23 - 25], а также эксплуатационных характеристик (износостойкости [18,22], усталостной прочности [15,26]) упрочненных образцов.…”

Section: Introductionunclassified

Influence of structure and properties of surface layer on fatigue durability of hardened steels strengthened by combined electromechanical treatment

Bagmutov

Dudkina

Zakharov

et al. 2019

Izv. vysš. učebn. zaved., Čern. metall.

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Using the example of hardened carbon steels (steel 45, U8), the effect of combination of various surface hardening technologies is considered (using electromechanical processing, surface plastic deformation, non-abrasive ultrasonic finishing and their combination) on changes in structural state and surface microhardness, cyclic durability of hardened specimens and fatigue failure mechanisms. The studies were carried out by the methods of optical and scanning electron microscopy and by microhardness and fatigue tests. It is shown that for the investigated steels in quenched state, a high-speed pulsed thermo-deformation effect during electromechanical processing is accompanied by an increase in the surface microhardness (by more than 50 %) and decrease in the fatigue limit (by 20 – 30 %). Such a change in properties is associated with formation in the surface layer of substantially non-equilibrium, inhomogeneous in chemical composition, ultradispersed phases with increased hardness. At the same time, in the near-surface metal volumes tempering processes of the hardened structure proceed with the formation of softening zones and tensile residual stresses, accompanied by a decrease in the microhardness in these zones and the fatigue limit of the specimens. Such effects reduce some of the materials performance characteristics during surface hardening. The ways to improve the properties of such products due to additional technological operations require further studies. Combined surface hardening (based on electromechanical processing, surface plastic deformation and non-abrasive ultrasonic finishing) of carbon steels allows, due to variations in the intensity of temperature and deformation effects, to purposefully change the structural-phase composition and stress-strain state of the surface and near-surface metal layers. As a result, it becomes possible to form a balanced complex of strength and fatigue characteristics of the samples, depending on the preliminary heat treatment of steel. The operations of surface plastic deformation and non-abrasive ultrasonic finishing after electromechanical hardening, due to intensive plastic deformation provide smoothing of the surface and healing of near-surface defects and allow correction of stress-strain state of the processed metal. It provides an increase in microhardness in the tempering zone by 20 – 25 % and the fatigue limit of the samples by 25 – 30 %.

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Numerical Study of Crack Initiation in Surface Hardened Ti6Al2V Alloy Based on the Residual Stress Analysis

Савкин

Denisevich

Bagmutov

et al. 2018

Springer Proceedings in Physics

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Relation between the fracture laws and the fatigue life of a surface-hardened pseudo-α titanium alloy

Cited by 4 publications

References 2 publications

Features of Changes in the Surface Structure and Phase Composition of the of α + β Titanium Alloy after Electromechanical and Thermal Treatment

Features of Changes in the Surface Structure and Phase Composition of the of α + β Titanium Alloy after Electromechanical and Thermal Treatment

Influence of structure and properties of surface layer on fatigue durability of hardened steels strengthened by combined electromechanical treatment

Numerical Study of Crack Initiation in Surface Hardened Ti6Al2V Alloy Based on the Residual Stress Analysis

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