The influence of heat treatment on the formation of the structure and the level of mechanical properties of high-alloyed titanium alloy

Kozlova, I. R.; Chudakov, E. V.; Tretyakova, N. V.; Markova, Yu. M.; Vasilieva, E. A.

doi:10.22349/1994-6716-2019-100-4-28-41

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…1), характеризующуюся большими объемными внутренними напряжениями. Микроструктура после отжига более выровненная и более однородная, по сравнению со структурой сплава, который не прошел термообработку, что увеличивает способность металла к процессу пластической релаксации напряжений [11][12][13][14][15][16].…”

Section: результаты и их обсуждениеunclassified

Causes´ Analysis of Cracks During Welding of High-Pressure Vessel Body Made of Titanium Alloy

Ryumshin¹,

Chevychelov

2023

Proceedings of the SWSU

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Purpose of reseach is to identify the causes of cracks during welding of high-pressure vessel body made of titanium alloy.Methods. Features of welded joint microstructure of high-pressure vessel body made of titanium alloy are described and studied by color flaw detection methods, fluoroscopy, and examination of the cuts. The causes of cracks in the bodies of pressure vessels are identified. The causes are a combination of internal stresses and structures features.Results. Based on the analysis of cut samples microstructure, it follows that the stamping of the power element was supplied without preliminary heat treatment. The formation of crack foci on the inner surface of the power element, at the place of alloy transition to the area of the attachment site, is primarily associated with large volumetric internal stresses, which are additionally summed up with surface stresses from machining and thermal stresses during welding. Based on the obtained data, it follows that when using a specialized tooling with a copper backing that provides pressurization of inert gas, welding stresses in a weld area are reduced by several orders of magnitude compared to the area where the tooling was without copper backing. As a result of the study, it was revealed that the causes of cracks in the bodies of high-pressure vessels are a combination of internal stresses due to the lack of preliminary thermal treatment of power elements made of titanium alloy, which are part of a high-pressure vessel, as well as stresses arising during welding of the power element with shells, considering design features.Conclusion. To eliminate the cause of cracks, additional experimental work was carried out. Surfacing the manual ADF of reinforcing roller into the zone of maximum stresses of the power element was done. The proposed solution met expectations - all the bodies of high-pressure vessels passed hydraulic tests, which made it possible to preserve material part.

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Section: результаты и их обсуждениеunclassified

Causes´ Analysis of Cracks During Welding of High-Pressure Vessel Body Made of Titanium Alloy

Ryumshin¹,

Chevychelov

2023

Proceedings of the SWSU

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Structural phase transformations in welding high-alloyed titanium alloy

Mikhaylov

Kozlova

Кузнецов

et al. 2021

Vopr. materialoved.

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This article investigates the change in the phase composition and structural state during the thermal cycle of welding a high-alloyed titanium alloy. It is shown that structural-phase transformations in the welded joint occurring under the influence of the thermal and deformation cycle of welding lead to the formation of metastable phases, and its subsequent decomposition can lead to ductility losses. To bring the metal of the welded joint to an equilibrium state, stabilizing annealing is required.

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Heat treatment of welded joints of experimental highly-doped titanium alloy

Mikhaylov

Kozlova

Кузнецов

et al. 2022

Vopr. materialoved.

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In this article, the effect of heat treatment on the phase composition and structural state of welded joints of an experimental highly-doped titanium alloy, made by argon-arc and electron-beam welding, was investigated. As a result of the heat treatment of welded joints at a temperature of 690 ° C, the structure of the near-seam zone is stabilized. However, in order to fully restore the plasticity of the welded joint with the formation of alpha-phase globules of a simple structure in the structure of the near-seam zone, a higher heat treatment temperature is required.

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The influence of heat treatment on the formation of the structure and the level of mechanical properties of high-alloyed titanium alloy

Cited by 3 publications

References 2 publications

Causes´ Analysis of Cracks During Welding of High-Pressure Vessel Body Made of Titanium Alloy

Causes´ Analysis of Cracks During Welding of High-Pressure Vessel Body Made of Titanium Alloy

Structural phase transformations in welding high-alloyed titanium alloy

Heat treatment of welded joints of experimental highly-doped titanium alloy

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