Method of production of critical parts from three-component titanium alloy

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and can be used for production of articles from three-component titanium-based alloy containing 2-6 wt % of aluminium and not over 4 wt % of vanadium or zirconium. Billets are subjected to equal-channel angular pressing at 400-470°C at the rate of 0.1-1.0 mm/s. Note here that nano- and sub microcrystalline structures are formed in the billet with grain size not over 0.5 mcm. Deformed billets are subjected to isothermal annealing at 450-550°C for 0.5-1.0 h. Then, the billet is subjected to upsetting or rotary forging at the temperature not higher than that of isothermal annealing.

EFFECT: higher strength and operating performances.

3 cl, 1 dwg

 

The invention relates to the field of metal forming and can be used in the manufacture of products using equal-channel angular pressing and isothermal annealing of workpieces from a structural alloys titanium based group Ti-Al-V and Ti-Al-Zr contents Al - 2-6 wt.% and V or Zr - not more than 4 wt.%, after acquiring the specified processing a modified high-strength nano - and submicrocrystalline structure with increased thermal stability and corrosion resistance at the level of the elevated material requirements highly responsible products, such as heat exchangers transport of nuclear-power plants, which should have increased reliability and service life.

The problem of providing high strength and operational durability of modern critical parts are working in the harsh conditions of high temperatures and aggressive gaseous and liquid media that are traditionally decided on the basis of the selection of the most promising industrial alloys, including competing successfully on the physico-mechanical and corrosion properties of structural titanium alloys, which include, in particular, the alloy PTSW included in the group of alloys based on titanium doped aluminum and vanadium (see, for example, article Igor .V. Gorynin YVES. and other "Application of titanium alloys in the equipment of power installations". - Sat. proceedings of the international scientific-technical conference "advanced metal materials and technologies (AMMT'2011)". SPb., Publishing house of the University. University, 2011, S. 313-324).

However, despite the current industry titanium alloys trend multicomponent alloying, which is dedicated to a large amount, for example domestic patenting (IPC SS 14/00), due to the increased modern requirements to the complex structural and operational properties of structural materials of particular practical interest from the point of view of providing control of the temperature and deformation modification of the structure of cause malokomplektnyj titanium alloys, such as a group of high-strength structural titanium alloys in the ternary system Ti-Al-V, which represents a three-component high-strength alloys for titanium base containing as alloying elements aluminum and vanadium, and can serve, for example, alloy - PTSV, the basic material for development of modern technological methods achieve the optimal combination of strength, thermal stability and corrosion resistance manufactured from it highly responsible products using equal-channel angular pressing (RK is P) and isothermal annealing of workpieces.

The prior art in the production of a highly responsible products of structural titanium alloys is characterized by traditional technology thermomechanical processing of titanium alloys of the Ti-Al-V, including, for example, heat treatment by heating of billets of alloy VTS to 960-970°C, exposure within 10-20 min and cooling to stabilize the mechanical properties of the workpiece by removing texture and grinding grain, followed by isothermal forging and achievement of the ultimate strength of the material of the workpieces 870-910 MPa (see and.with. The USSR №1544528, C22F 1/18, 1990) when corrosion properties of such products is determined not sufficiently high corrosion resistance of the specified alloy in connection with practically absent at this temperature deformation by modifying the structure of the blanks, which increases corrosion resistance.

In the absence of information sources with information about the analogues, close to the claimed method of manufacture important products, the applicant has chosen a form of narrative descriptions and formulas of the claimed invention without the prototype.

The technical result of the proposed method - improving technology manufactured responsible products through the creation of the basic guidelines to clarify the mode of the proposed temperature-Def is racionero modification (using pressing and isothermal annealing) patterns of workpieces from the proposed three groups of structural alloys of the Ti-Al-V or Zr), titanium-based, depending on the selected additional target alloying elements (V or Zr) and its content, providing a winning combination increased the strength, thermal stability and corrosion resistance of the workpieces and retention of such properties in the manufactured products in the subsequent stamping or rotary forging blanks in the proposed limit upper temperature limit specified formation, increasing its value and extend the temperature range by reducing the amount of the lower temperature limits of shaping, expanding production capacity of hot forming and expanding Arsenal of technological possibilities of production of a highly responsible products.

To achieve the technical result in the method of manufacturing of a three-component alloy based on titanium containing aluminum in the amount of 2-6 wt.% and vanadium or zirconium in an amount of not more than 4 wt.%, hold pressing billets at a temperature of 400-4700With a speed of 0.1-1.0 mm/s forming in her nano - and submicrocrystalline structure with a grain size not more than 0, 5 μm, isothermal annealing of the deformed billet at a temperature of 450-5500C for 0.5-1.0 hour and the subsequent formation of products by stamping or rotating the forging of billets at a temperature not higher than the temperature of isothermal annealing.

In the particular case of using the method of pressing billets of alloy PTV containing aluminum in the amount of 4.7 wt.% and vanadium in the amount of 1.9 wt.%, with the initial average grain size of 25-30 μm exercise for four cycles with a speed of 0.4 mm/s at a temperature of 4500With receipt of the yield stress of the deformed material of the workpieces to 1200-1250 MPa, and isothermal annealing of deformed workpieces is carried out at a temperature of 4500C for 0.5 hour.

To increase stability, provide a winning combination of an increase in the use of the method strength, thermal stability and corrosion resistance of the workpieces and retention of such properties in the manufactured products pressing and isothermal annealing is performed with the provision of the concentration of aluminum atoms along the grain boundaries of the titanium component is not more than 0.2 wt.%.

Increased adaptability of the proposed method on the basis of yield with an improved combination of strength, thermal stability (reflected in the increase of the temperature of the beginning of the softening of the material of the workpieces to 5500C) and corrosion resistance (in terms of the reduction of the depth of the affected intergranular gracebalawag corrosion layer 50-100 μm after 500 hour test at 2500C), may result from grinding grains blanks the C source coarse-grained alloy based on titanium, containing aluminum and as an additional target of alloying vanadium or zirconium, with pressing billets with accompanying specified grinding processes intergranular diffusion of aluminum and the above-mentioned additives and the final diffusion modification of the structure obtained in the final diffusion-controlled redistribution in the blanks at the grain boundaries of titanium, aluminum and vanadium or zirconium with a local decrease of the concentration of aluminum atoms along the boundaries of these grains), confirms the technical novelty of the proposed method and its compliance with the conditions of patentability "inventive step".

Known in Russia (see, for example, patent RF №2388566, B21J 5/00, C22F 1/18, 2010) and abroad (see, for example, US patent No. 5904062, VS 23/00, 1999) analogues, including pressing alloys titanium base containing aluminum and vanadium, do not contradict the novelty and inventive step of the claimed method of manufacturing due to the limited purpose of this activity as characteristic of the way - ensuring durability.

In Fig.1 shows a micrograph of the surface layer subjected gracebalawag intergranular corrosion of alloy PTSW up (Fig.1A) and after (Fig.1B) pressing (with the number of pressing cycles, equal to three), in accordance with the claimed SPO is obom manufacturing

Implementation of the proposed method in the following example.

For more accurate temperature and speed pressing of workpieces from industrial deformable titanium alloy PTSW composition Ti-4.7%Al-1.9%V with the initial average grain size of 25-30 μm (control distribution along the grain boundaries of titanium atoms, aluminum ≤0.2 wt.%) the formation of nano - and submicrocrystalline structure in the blanks held in the tool with the angle of intersection of worker and output channelsπ/2using the maximum hard mode "Inwith"in which the workpiece after each cycle turned to the corner ofπ/2around its longitudinal axis.

After the output of the selected temperature and high-speed mode pressing (temperature pressing 450°C at the optimum (experimentally confirmed) total number of pressing cycles equal to 4, and the pressing speed of 0.4 mm/s, determined by the technical capabilities of the equipment) to obtain the structure with average grain size of ~0.5 μm and the increase of the yield stress of the deformed material of the workpieces with such a structure to 1200-1250 MPa, the workpiece was subjected to isothermal annealing at about the optimum (experimentally confirmed) temperature 450°C for 30 min with a simultaneous increase in thermal stability of the workpieces, in terms of the increase in the temperature of the beginning of the softening of the material of the workpieces to 550°C and increasing the corrosion resistance of workpieces, in terms of the reduction of the depth of the affected intergranular gracebalawag corrosion layer 50-100 μm (see Fig.1B, which shows the depth affected by corrosion layer is 100 μm with the number of pressing cycles - 3 with decrease in the depth of this layer when the number of cycles is 4 to 50 μm) after 500 hours of testing at 250°C.

Corrosion tests were carried out in a mixture of crystalline salts NaCl and KBr, taken in the ratio of 300:1 in the ambient air test vessel at 250°C for 500 h with the assessment of corrosion damage in accordance with GOST 9.908-85.

Studies of the surface layer structure of the alloys was carried out on an optical microscope Leica IM DRM and scanning electron microscope Jeol JSM-6490 x-ray microanalyzer INCA 350.

Achievement based on the increased stability of the complex high mechanical and performance properties of products manufactured, for example, rotary forging the billet at a temperature not higher than 550°C after pressing and isothermal annealing of these preparations, it was possible in the proposed experimentally detected temperature of the pressing 400-470°C and calculated sound velocity range of pressing of 0.1-10 mm/s, provide high-strength nano - and submicrocrystalline structure in the blanks with an average grain size not more than 0.5 μm, and the interval of temperatures subsequent isothermal annealing 450-550°C, for 0.5 to 1.0 hours (with 15-30%reduction achieved by the complex characteristics in cases 1-2-percentage deviations from the boundary of regime values) preliminary specification mode pressing and subsequent isothermal annealing of nano - and submicrocrystalline structure in the resulting diffusion-controlled redistribution in the blanks of aluminum contained in the alloy in the range of 2-6 wt.%, at the grain boundaries of titanium, resulting in an abrupt decrease in the concentration of aluminum atoms along the boundaries of these grains up to 0.2 wt.% and less, and diffusion-controlled distribution based on the grain boundaries of the titanium atoms of vanadium - extra target alloying additives (which is similar to the experimental background provides the zirconium contained in the alloy in both these additives is not more than 4 wt.% (see Chuvildeev Century. N. and others, "Effect of simultaneously improving the strength and corrosion resistance of nanostructured and submicrocrystalline titanium alloys obtained by the method of equal-channel angular pressing". - The collection of materials "X Petersburg readings on problems of strength, dedicated to the memory of Professor C. A. Likhachev. C.-P., 2012, part 2, S. 23-25).

The increase in strength of the modified three-component structure in the traditional deformation grinding can explain the high initial coefficient of grain boundary hardening due to the high concentration of aluminum atoms on the grain boundaries, which reduces the corrosion resistance of titanium (see the book of Collins E. C. "Physical metallurgy of titanium alloys". M, metallurgy, 1958, 224 S.). During pressing at elevated temperature and subsequent annealing, along with the formation of new grain boundaries, these boundaries decreases the concentration of aluminum as a result of its diffusion redistribution and after the final distribution of atoms of aluminum and vanadium or zirconium) increases corrosion resistance with experimentally recorded simultaneously increasing thermal stability.

The range of concentrations of the component composition of the alloy titanium based in the claimed method was determined by the traditional recommendations for their impact on improving the proposed method of manufacturing performance (see, for example, the book Igor .V. Gorynin I. W. and B. Chechulin B. "Titan in engineering. M., "engineering", 1990, 400 C., and the book Collins E. C. "Physical IU halloweenie titanium alloys". M, metallurgy, 1958, 224 S., and article Tomashova N. D., and others, "Influence of alloying elements on corrosion behavior of titanium". - Protection of metals, 1973, I. IX, No. 1, S. 20-22).

Thus is formed an improved thermally stable submicrocrystalline structure highly responsible products with higher value of the temperature of the beginning of recrystallization) with simultaneously high strength and corrosion resistance. Strength properties produced offered by way of a highly responsible products from alloy PTSW 1.5-3 times higher than the analogous characteristics of the structural elements of nuclear power plants from standard alloys and resistance to intergranular hot salt corrosion in the proposed manufacture of 4-6 times the corrosion resistance of the products obtained from coarse-grained structural titanium alloy PTSW using standard mode thermo-mechanical processing of workpieces.

Malokomplektnoj structural alloy for titanium base and the opportunity cost of the refinement of the production process of production of a highly responsible products with high output strength and performance properties enhance controllability, stability, and manufacturability of their production.

1. A method of manufacturing a product is from a three-component alloy based on titanium, containing aluminum in the amount of 2-6 wt.% and vanadium or zirconium in an amount of not more than 4 wt.%, characterized in that it includes equal channel angular extrusion billet at a temperature 400-470°With a speed of 0.1-1.0 mm/s forming in her nano - and submicrocrystalline structure with a grain size not more than 0, 5 μm, isothermal annealing of the deformed billet at a temperature of 450-550°C for 0.5-1.0 hour and the subsequent formation of products by stamping or rotary forging the billet at a temperature not higher than the temperature of isothermal annealing.

2. The method according to p. 1, characterized in that the equal channel angular extrusion billets of alloy PTV containing aluminum in the amount of 4.7 wt.% and vanadium in the amount of 1.9 wt.%, with the initial average grain size of 25-30 μm exercise for four cycles with a speed of 0.4 mm/s at a temperature of 450°C To produce the yield stress of the deformed material of the workpieces to 1200-1250 MPa, and isothermal annealing of deformed workpieces is carried out at a temperature of 450°C for 0.5 hour.

3. The method according to p. 1, characterized in that the equal-channel angular pressing and isothermal annealing is performed with the provision of the concentration of aluminum atoms along the grain boundaries of the titanium component is not more than 0.2 wt.%.



 

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