Electron structure and properties of intermetallic compounds in titanium‐metal dissimilar joints

Chularis, A. A.; Kolpachev, A. B.; Kolpacheva, O. V.; Tomashevskii, V M

doi:10.1080/09507119509548899

Cited by 11 publications

(4 citation statements)

References 1 publication

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“…From the standpoint of the weldability [5] of dissimilar joints, according to such criteria of weldability as thermal, thermodynamic, taking into account the chemical affinity to gases and carbon, the nature of metallurgical binary or multiple interactions, types of crystal lattices and their parameters, the considered group of alloys differs in many respects from the above series. Indeed, from the standpoint of metallophysical indicators, table.…”

Section: Resultsmentioning

confidence: 99%

Joining of Titanium and its Alloys with Aluminum Alloys by Friction Stir Welding

Rzaev

Chularis

Rybakov

2019

KEM

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This article is devoted to the study of the mechanism of formation of dissimilar welded joints Ti-2Al-1.5Mn, pure titanium (Ti35A) and aluminum (Аl (pure), Аl-6Mg-0.5Mn) alloys obtained by friction stir welding (FSW). The investigated microstructure of the weld joint nugget (WN), zones of thermo mechanically affected zone (TMAZ) and heat affected zone (HAZ) formed at FSW between Ti-2Al-1.5Mn, Ti35A and aluminum (Аl (pure), Аl-6Mg-0.5Mn) alloys. Zones of welded joints at FSW are formed in the mode of structural superplasticity (SP) with a specific shear-band layered structure with alternating layers. The achievement of superplastic state (SPS) in the formation of WN, TMAZ, HAZ is provided by the step–by–step transformation of various mechanisms of plastic deformation in the mode of simple, collective, abnormal dynamic recrystallization, prepared by the processes of dynamic return, polygonization with the transition to post-dynamic recrystallization by the mechanisms of Bailey–Hirsch, Kahn-Burgers-Taylor. At FSW aluminum and titanium alloys with polymorphism, SPS is supported additionally due to recrystallization by twinning and as a result of phase transformations of alpha-gamma or alpha-beta phases.

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Section: Resultsmentioning

confidence: 99%

Joining of Titanium and its Alloys with Aluminum Alloys by Friction Stir Welding

Rzaev

Chularis

Rybakov

2019

KEM

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“…Solid-phase heating takes place in the heat-affected zone (HAZ). Here, phase transformations can proceed on the steel and titanium interface, leading to intermetallic phase (IMPh) formation [5]. Due to their high values of hardness and brittleness, such IMPh formation leads to hot cracking, which promotes intensive destruction of bimetal plate welded joints [1,6].…”

Section: Introductionmentioning

confidence: 99%

Features of Intermetallic Formation in the Solid Phase on a Steel–Titanium Bimetal Interface under the Conditions of Arc Welding

Korzhyk

Zhang

Khaskin

et al. 2023

Metals

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The object of this study is the formation of intermetallic phases (IMPhs) in the heat-affected zone (HAZ) of joints of steel–titanium bimetal plates produced by arc welding. A titanium layer (2 mm) was welded by the plasma method (PAW), a barrier layer of Cusi3Mn1 bronze was deposited on it by the TIG method, the first steel layer was deposited by CMT, and Puls-MAG was used for filling the groove. Here, heating in the solid phase takes place in the HAZ, which may lead to undesirable formation of brittle IMPhs and further welded joint failure. Mathematical modeling was performed and metallurgical features formed during the processes of heating of the HAZ in bimetal steel–titanium plates were studied to identify the risk of IMPh formation. It was found that at a temperature increase from 900 to 1450 °C, a continuous intermetallic layer formed on the steel–titanium interface, which contained FeTi IMPh, and the width of which increased from 1 to 10 μm. In the temperature range 1300…1430 °C, an intermetallic TiFe2-type phase additionally formed from the titanium side. In the temperature range 1430…1450 °C, the TiFe2 phase was replaced by the TiXFe phase, which formed both from the steel side and from the titanium side. This phase consists of intermetallics (73–75% Ti + 27–25% Fe) and (80–85% Ti + 20–15% Fe), and it is close to the Ti2Fe-type phase. The interlayer of intermetallics, formed at temperatures of 900…1300 °C, has a continuous morphology (HV0.01–650…690). At temperatures rising above 1300 °C, the IMPh interlayer became more ramified (HV0.01–590…610) because of the formation of a larger number of pores and microcracks within it. In the temperature range 900…1450 °C, solid-phase diffusion proceeded in the steel–titanium bimetal near the interface of the two metals. A zone of iron diffusion, 5–10 μm to 40–60 μm in width, formed in titanium. In steel, a zone of titanium diffusion 15–20 μm to 120–150 μm in width formed, starting from 1300 °C and higher. It is recommended to perform industrial welding of steel–titanium bimetal in modes, for which the heat input is equal to 200…400 J/mm. Here, during the period 10–12 s, the heating temperature of the HAZ 1.5–3.5 mm in width is equal to 900–1150 °C. It promotes formation of an intermetallic FeTi-type interlayer of up to 1–2 μm width.

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“…The process of development and amount of these phases depends on process-related parameters and the temperature-time cycles. Thus, if joints with high toughness and strength are required, the intermetallic phase layer has to be limited to a minimum thickness [2,3].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Influence of Laser Power on the Temperature Distribution during Dissimilar Welding of Ti-Al Alloy Plates

Babalová

Behúlová

2016

AMM

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The paper deals with the design and testing of laser power for laser beam welding of titanium Grade 2 and EN AW 5754 aluminium alloy plates. Transient temperature fields during formation of dissimilar butt joints of Ti-Al alloy plates were investigated by FEM simulation using the program code ANSYS. Moving Gaussian volumetric heat source was applied to model the heat input to the weld. The influence of laser power on the temperature distribution in welded materials and parameters of the weld pool were evaluated. Based on the results of numerical simulation, the suitable laser power was suggested for the real experiments of Ti–Al dissimilar laser welding using the TruDisk 4002 disk laser.

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Electron structure and properties of intermetallic compounds in titanium‐metal dissimilar joints

Cited by 11 publications

References 1 publication

Joining of Titanium and its Alloys with Aluminum Alloys by Friction Stir Welding

Joining of Titanium and its Alloys with Aluminum Alloys by Friction Stir Welding

Features of Intermetallic Formation in the Solid Phase on a Steel–Titanium Bimetal Interface under the Conditions of Arc Welding

Numerical Simulation of the Influence of Laser Power on the Temperature Distribution during Dissimilar Welding of Ti-Al Alloy Plates

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