Electron-Beam Welding - Structural-Phase State and Microhardnes in the Weld Zone in a Submicrocrystalline Titanium Alloy Grade2

2017 ◽  
Vol 906 ◽  
pp. 32-37 ◽  
Author(s):  
Vasilii A. Klimenov ◽  
Anatolii A. Klopotov ◽  
Yu.A. Abzaev ◽  
K.A. Kurgan ◽  
Yu.A. Vlasov
Keyword(s):  
Titanium Alloy ◽  
Heat Affected Zone ◽  
Phase State ◽  
Electron Beam Welding ◽  
Structural Phase ◽  
Weld Zone ◽  
X Ray Diffraction ◽  
Structural Phase State ◽  
X Ray ◽  
Microhardness Distribution

The paper presents the results of the X-ray diffraction analysis of structural-phase states in the weld zone of a titanium alloy Grade2 in micro-and submicrocrystalline states. It is established that the structural-phase state in the weld zone and in the heat-affected zone depends on the state of samples of the alloy Grade2 before welding. It is shown that formation process of metastable phases ω-Ti and α′′-Ti occurs in the submicrocrystalline state in the alloy Grade2 in the weld zone and in the heat-affected zone. Investigations of the features of the microhardness distribution in the weld zone in alloys Grade2 in micro-and submicrocrystalline states are carried out. Different character of microhardness distributions in the weld zone in the samples depending on the structural-phase state of welded plates made of alloy Grade2 is determined.

scholarly journals Features of the structural phase state of a weld produced by electron-beam welding in the submicrocrystalline grade 2 titanium alloy

2018 ◽  
Vol 143 ◽  
pp. 03011
Author(s):  
Kirill Kurgan ◽  
Vasily Klimenov ◽  
Anatoly Klopotov ◽  
Sergey Gnyusov ◽  
Yuri Abzaev ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Electron Beam ◽  
Heat Affected Zone ◽  
Electron Beam Welding ◽  
Structural Phase ◽  
Weld Zone ◽  
Distribution Patterns ◽  
High Concentration ◽  
Factors Affecting ◽  
Microhardness Distribution

This paper presents the results of structural studies for a welded joint of the Grade 2 titanium alloy in submicrocrystalline and microcrystalline states produced by electron beam welding when joining 2-mm-thick plates. Microhardness distribution patterns of the Grade-2 titanium alloy in micro- and submicrocrystalline states are identified in the weld zone and heat-affected zone. These patterns reflect a difference in structural phase states. It is assumed that one of the key factors affecting both the structural state and microhardness distribution in the weld zone and heat-affected zone during electron-beam welding is high concentration of oxygen atoms embedded into the crystal lattice of α–Ti-based solid solution.

scholarly journals Features of the structural phase state of a weld produced by electron-beam welding in the submicrocrystalline grade 2 titanium alloy

2018 ◽  
Vol 143 ◽  
pp. 03011
Author(s):  
Kirill Kurgan ◽  
Vasily Klimenov ◽  
Anatoly Klopotov ◽  
Sergey Gnyusov ◽  
Yuri Abzaev ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Electron Beam ◽  
Phase State ◽  
Electron Beam Welding ◽  
Structural Phase ◽  
Structural Phase State

Changing of the Structural-Phase State and Mechanical Properties of VT-23 Titanium Alloy under Surface Treatment by Intense Flux of Copper Ions

2015 ◽  
Vol 1085 ◽  
pp. 284-288 ◽  
Author(s):  
Viktor Sergeev ◽  
Mark P. Kalashnikov ◽  
Vasilii V. Neufeld
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Phase State ◽  
Copper Ions ◽  
Structural Phase ◽  
Ion Current ◽  
High Flux ◽  
Structural Phase State ◽  
Ion Treatment ◽  
Ion Current Density

Results of surface modification of the VT-23 titanium alloy by high flux of copper ions with an energy of 2 keV and ion current density of 3.5 mA/cm2 was studied. The dependence of the microhardness and penetration depth of ion as function of duration of ion treatment was determined. Structural-phase state of ion-modified of the VT-23 titanium samples surface layer was investigated by TEM and SEM. Microhardness was researched by nanoindentation method.

The Influence of Welding Mode on the Structural-Phase State of Steel 0.12С-18Cr-10Ni-1Ti-Fe at Welding by Modulated Current

2020 ◽  
Vol 303 ◽  
pp. 118-127
Author(s):  
A.N. Smirnov ◽  
Natalya A. Popova ◽  
E.L. Nikonenko ◽  
N.V. Ababkov ◽  
K.V. Knyazkov ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Base Metal ◽  
Heat Affected Zone ◽  
Phase State ◽  
Dislocation Substructure ◽  
Structural Phase ◽  
Droplet Transfer ◽  
Structural Phase State ◽  
Fine Droplet ◽  
Thin Foils

Investigations conducted by transmission electron microscopy on thin foils were aimed at studying the structural-phase state of heat-affected zone of the welding joint performed by modulated current at two welding modes: coarse-droplet and fine-droplet transfer. Welding was conducted on the austenitic steel 0.12С-18Cr-10Ni-1Ti-Fe using the facility UDI-203. Welding modes were: Ii = 175 А (coarse-droplet transfer) and 140 А (fine-droplet transfer). Welding was performed on thin foils sized 200 × 15 × 4 mm3. Investigations were focused on heat-affected zone at the distance of 1 mm from the weld line towards the base metal – the base metal zone and at the distance of 0.5 mm towards the welded metal – the welded metal zone. The studies showed that in the state before welding the steel matrix presents γ-phase (austenite), which has face-centered cubic (fcc) crystal lattice. Morphologically the steel structure is given as grains where defect structure is presented by only network dislocation substructure, and grains where along with the dislocation substructure there are mechanical (or deformation) microtwins in the form of packages of one, two and three systems. It was established that welding of steel 0.12С-18Cr-10Ni-1Ti-Fe by modulated current with coarse-droplet transfer leads to martensitic transformation γ → ε only in the welded metal zone. At fine-droplet transfer welding leads to martensitic transformation γ → ε both in the base metal zone and in the welded metal zone. In the welded metal zone phase transformation γ → ε occurs more intensively. It was revealed that crystal lattice distortion in the whole heat-affected zone at welding by modulated current has only plastic nature, irrespective of the welding mode. Welding by modulated current with fine-droplet transfer leads to lower internal stresses in the whole heat-affected zone.

scholarly journals Structure of tantalum coatings on NiTi substrate deposited by magnetron sputtering

2022 ◽  
Vol 2155 (1) ◽  
pp. 012013
Author(s):  
A S Dikov ◽  
A S Larionov ◽  
E A Zhakanbayev ◽  
L A Dikova ◽  
A Zh Sanssyzbayeva ◽  
...  
Keyword(s):  
Shape Memory ◽  
Phase State ◽  
Structural Phase ◽  
Interplanar Distance ◽  
X Ray Diffraction ◽  
Two Phase ◽  
Structural Phase State ◽  
Initial Stage ◽  
Coating Formation ◽  
Tantalum Coatings

Abstract The paper provides the results of studies of the structural-phase state of tantalum coatings prepared by magnetron deposition. The coatings were deposited on substrates made of titanium nickelide with a shape memory. The NiTi temperature during coating deposition did not exceed 100 °C. The structural-phase state of Ta was determined by X-ray diffraction at different stages of coating formation. It has been shown that at the initial stage of deposition, two-phase coatings (α- and β-Ta) are formed. The synthesis of the coating from Ta leads to the growth of interplanar distance of the B2 austenite phase in the crystallographic direction (100). The growth of interplanar spacing is caused by formation of microstresses during interaction with incident tantalum ions. The lattice parameters of the B19 ‘phase, responsible for appearance of the shape memory effect, do not change during deposition of the tantalum coating.

Weakly Stable Structural-Phase States of a Submicrocrystalline Alloy Grade 2 in the Weld Zone Obtained Using Electron-Beam Welding

2018 ◽  
Vol 30 ◽  
pp. 60-66
Author(s):  
K.A. Kurgan ◽  
Vasily A. Klimenov ◽  
Anatolii A. Klopotov ◽  
Yurii A. Abzaev ◽  
Aleksandr I. Potekaev ◽  
...  
Keyword(s):  
Solid Solution ◽  
Electron Beam ◽  
Heat Affected Zone ◽  
Electron Beam Welding ◽  
Structural Phase ◽  
Weld Zone ◽  
Crystalline Lattice ◽  
Interstitial Oxygen ◽  
Wide Range ◽  
Oxygen Atoms

The structural-phase state of weld joints of the samples of Grade 2 alloys with micro- and submicrocrystalline structure is studied using methods of X-ray diffraction analysis. The weld joint was obtained by joining plates with a thickness of 2 mm using the electron-beam welding method. It is established that the transfer of the titanium alloy Grade 2 from the microcrystalline state into the submicrocrystalline state during the process of gradual grinding of grains in the samples by the abc-pressing method at a parallel stepwise decrease of the temperature in the range of 750-500 °C leads to an intensive introduction of oxygen atoms into the crystalline lattice of the solid solution a-Ti. The presence of an increased content of oxygen atoms in the crystalline lattice of the solid solution a-Ti in the submicrocrystalline state in the Grade 2 alloy in the weld zone and in the heat-affected zone promotes the formation of metastable phases w-Ti and α''-Ti. The obtained results made it possible to assume that in the process of electron-beam welding in the Grade 2 alloy in the submicrocrystalline state, an increased concentration of interstitial oxygen atoms in the crystalline lattice of the solid solution based on a–Ti plays a significant role in the formation of a wide range of structural-phase states in the weld zone and in the heat-affected zone.

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