Titanium №2 2013

 

MATERIALS SCIENCE

 

CREEP OF PSEUDO-a TITANIUM ALLOYS AND ITS INFLUENCE ON STRESS-STRAIN STATE OF STEAM TURBINE DETAILS

 

V. Travin, L. Ivanova, A. Kudriavtsev, I.Kozlova

 

It is studied the main regularity of creep deformation growth on example of pseudo-a titanium alloy 5B in 200-500oC temperature interval. It is shown that in 200-400oC temperature interval the creep curve character of the alloy differs from the creep curve character at more high temperatures (450-500oC), where the creep growth follows the standard laws. The decreasing of established creep speed until zero and unmonotonous character of creep curves in temperature interval of 200-400oC is stipulated by the deformation aging process. Practical examples of creep influence on stress-strain state of steam-turbine details are given.

 

Keywords: creep deformation, titanium alloy, strength-deformed condition, energy-machine building.

 

 

Semi-products manufacturing technologies

 

APPLICATION OF HYDROGEN TECHNOLOGIES FOR MANUFACTURING DEFORMED SEMI-FINISHED PRODUCTS FROM TITANIUM ALUMINIDE-BASED ALLOY WITH ADVANCED COMPLEX IF MECHANICAL PROPERTIES

 

A. Mamonov, S. Skvortsova, A. Ovchinikov, V. Spektor, O. Gvozdeva, V. Pozhoga

 

It was shown that the application of hydrogen as a temporary alloying element allowed to decrease Nb content in the Ti3Al intermetallide-based alloy fourfold in comparison with super-a2-alloys, improve technological plasticity at low temperatures and increase characteristics of strength.

 

Keywords: high-resistance titanium alloy, intermetallide, hydrogen, alloying, technological plasticity, strength.

 

PRODUCTION OF INGOTS OF TWO-PHASE Nb, Zr AND Cr ALLOYED g-TiAl BY THE ELECTRON BEAM MELTING EBM METHOD WITH B AND La ADDITIONS

 

S. Akhonin, E. Asnis, A. Severin, V. Berezos

 

The technology was developed for electron beam melting of the Nb, Zr and Cr alloyed Ti-Al system intermetallic with boron and lanthanum added to it during melting from lanthanum hexaboride. The new flow diagram of two-stage melting of an ingot was proposed, minimizing losses of alloying elements characterised by a high vapour pressure. Microstructure of the produced ingots was investigated, and X-ray spectrum microanalysis of the ingots was carried out. It was shown that the developed technology holds much promise for production of the high-quality ingots of two-phase g-titanium aluminide.

 

Keywords: electron beam melting, titanium aluminide, ingot, lanthanum hexaboride, boron, lanthanum.

 

EXPERIENCE OF MANUFACTURING INGOTS WEIGHTING UP TO 17 TONS OUT OF TITANIUM PSEVDO-a ALLOYS

 

V. Gorynin, A. Kydriavtsev, A. Khachaturian, I. Pyzakov, A. Bereslavsky, L. Machishina, M. Leder, M. Kornilova

 

The paper presents the results of manufacturing and researching of titanium psevdo-a alloys ingots weighting up to 17 tons as well as large capacity semi finished product made of them. Ingots were manufactured using a ternary vacuum-arc remelting method. Final remelting is carried out in a ø1200mm crystallizer using a magnetic agitation. It was revealed that during crystallization zonal types of liquation are absent. Forming of a significant micro inhomogeneity during α - and β stabilizing components distribution due to slow cooling at β→α+β- transformation was also shown. Large capacity plates and forgings manufacturing technologies being developed have provided the given type of structure and crystallographic texture as well as the required level of metal mechanical properties.

 

Keywords: titanium alloys, large capacity ingots, check methods, macrostructure, chemical homogeneity.

 

Semi-products treatment technologies

 

MATERIAL PROVIDING OF ENTIRE-ROLLED RINGS PRODUCTION FROM WELDABLE HIGH-STRENGTH TITANIUM ALLOYS FOR ENERGOEQUIPMENT DETAILS

 

A. Kydriavtsev, I. Kozlova, L. Ivanova, Е. Chudakov

 

In the article studied the correlation between structure and service properties level of entire-rolled ring metal from weldable high-strength pseudo-a titanium alloy. It is shown the opportunity of providing service properties complex by thermoplastic processing in terms of energoequipment working condition. It is established that for providing the necessary characteristics of thermal stability, for example, high-temperature creep, it is necessary to make regulated structure by thermoplastic processing.

 

Keywords: high-strength titanium alloys, thermoplastic processing, structure, service properties, energymashine building.

 

INFLUENCE OF ELECTRON-BEAM WELDING MODES FOR HEAT-RESISTANT TITANIUM ALLOYS ON COLD CRACKING SUSCEPTIBILITY

 

E. Vrzhizhevsky, E. Velikoivanenko, G. Rozynka, S. Akhonin, A. Milenin

 

The analysis of cold cracking susceptibility in flat samples from a heat-resistant complex-alloyed Ti-6Al-2,5Sn-3,88Zr-0,39Mo-0,55Si alloy under electron-beam butt-to-butt welding was implemented in this work on the basis of the complex numerically-experimental approach. It was revealed that the local nonstationarity of hydrodynamical and thermokinetical processes at the excess defocusing of electron beam could cause the increase of tensile longitudinal stresses and appearance of cold cross cracks in the region of joint metal and heat-affected zone in the welding samples.

 

Keywords: heat-resistant titanium alloys, electron-beam welding, cold cracks, stress-strain state

 

 

Titanium application

 

THE BENEFITS OF VT23 TITANIUM ALLOY APPLICATION IN NEW PRODUCTS OF THE «SUKHOI» COMPANY

 

A. Yakovlev, A. Filatov, A. Burkhanova, Yu. Popova, N. Nochovnaya

 

In the present article the issues concerning titanium alloys application in modern aircraft constructions have been discussed. The advantages of the high-strength VT23 titanium alloy have been compared to those of its analogs both from the point of view of materials science and technology. Also there have been highlighted the main benefits of VT23 alloy such as a wide-range strength variation ability and the possibility of different semi-finished products manufacturing. The economic aspects of VT23 alloy airframe application were analyzed and favorable opportunities for weight-to-fly ratio improvement have been revealed.

 

Keywords: VT23 titanium alloy, heat treatment, semi-finished product, construction, strength

 

Titanium market

 

THE IMPACT OF INCREASING EXPORTS OF PRODUCTS WITH HIGH VALUE ADDED ON THE LEVEL OF INDUSTRY RISK OF THE TITANIUM ENTERPRISE

 

O.A. Ugarova, I.P. Ilychev, V.V. Brinza, A.V. Aleksakhin, O.I. Kalinsky

 

The article estimated the impact of increased production and export of products with high added value at the level of industry risk metals companies on the basis of the production of leverage effect. Production of high value added products reduces the risk of industry enterprises, provided that the ratio of its profitability to the share of fixed costs per unit cost of production is higher than the ratio for the replaced products. Production of high value-added products can be considered as one factor the industry risk management enterprise.

 

Keywords: titanium, efficiency, export, profit margins, profit, fixed and variable costs, risk, operating leverage, added value.

 

Events and anniversaries

 

Russian titanium

To the 75-year anniversary Anatoly Kydriavtsev

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