RU2614294C1 - Method of blades forgings manufacturing from titanium alloys - Google Patents

Method of blades forgings manufacturing from titanium alloys Download PDF

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Publication number
RU2614294C1
RU2614294C1 RU2016112814A RU2016112814A RU2614294C1 RU 2614294 C1 RU2614294 C1 RU 2614294C1 RU 2016112814 A RU2016112814 A RU 2016112814A RU 2016112814 A RU2016112814 A RU 2016112814A RU 2614294 C1 RU2614294 C1 RU 2614294C1
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RU
Russia
Prior art keywords
workpiece
stamping
billet
isothermal
extrusion
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RU2016112814A
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Russian (ru)
Inventor
Михаил Леонидович Первов
Анна Сергеевна Скобелева
Сергей Алексеевич Головкин
Original Assignee
Федеральное государственное бюджетное образовательное учреждение высшего образования "Рыбинский государственный авиационный технический университет имени П.А. Соловьева"
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Application filed by Федеральное государственное бюджетное образовательное учреждение высшего образования "Рыбинский государственный авиационный технический университет имени П.А. Соловьева" filed Critical Федеральное государственное бюджетное образовательное учреждение высшего образования "Рыбинский государственный авиационный технический университет имени П.А. Соловьева"
Priority to RU2016112814A priority Critical patent/RU2614294C1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18High-melting or refractory metals or alloys based thereon

Abstract

FIELD: metallurgy.
SUBSTANCE: forgings manufacturing method from titanium alloys includes extrusion of billet under isothermal conditions at the same temperature of heating the billet and die and subsequent isothermal forging of the extruded billet. The extrusion and isothermal forging is performed at the heating temperature of the die and billet 800-830 °C±40 °C at average strain rate not more than 0.3 mm/s.
EFFECT: reduce of alloy deformation resistance and increase of dimensional stability of dies, manufacturing of blade forgings with a fine-grained structure.
1 dwg,1 ex

Description

The invention relates to the processing of metals by pressure and can be used for the manufacture of stampings of GTE blades from titanium alloys.
A known method of manufacturing stampings of blades from a two-phase titanium alloy, comprising shaping the initial billet in the form of a rod, subsequent isothermal stamping of a pre-lubricated and heated fashioned billet on a hydraulic press, trimming the region of the resulting stamping of the blade, then dimensional chemical etching of the alpha layer on the surface of the stamping of the blade and its vacuum heat treatment, after which the blade is stamped by isothermal heat setting heated stamping (RF Patent for the invention No. 2525961 of 05/06/2013, publ. 08/20/2014, IPC B21K 3/04, B21D 53/78, B21D 3/16).
The disadvantage of this method is the low dimensional stability of the dies due to the high temperature of isothermal stamping and high resistance to plastic deformation of the wrought alloy.
A known method of manufacturing stampings of blades made of titanium alloy, including preliminary and final stamping, and heating the workpiece for each transition of preliminary stamping is carried out to a temperature above the temperature of the onset of polymorphic transformation, the final stamping is carried out in the temperature range of the beginning of polymorphic transformation and complete polymorphic transformation (Patent for the invention No. 2229952 dated 11/15/2002, published on 06/10/2004, IPC B21J 5/00, B21K 3/04).
The disadvantage of this method is the low resistance of die tooling and high resistance to plastic deformation of the wrought alloy.
The closest is a method of producing an ultrafine-grained blank of GTE blades from titanium alloys, which includes extruding the blank in isothermal conditions at the same heating temperature of the blank and die, and subsequent isothermal stamping of the extruded blank (Patent for invention No. 2486275 of 05.24.2012, publ. June 27, 2013, IPC C22F 1/18, B21J 1/00, F01D 5/00).
The disadvantage of this method is the large number of precipitation transitions to obtain an ultrafine-grained structure, which significantly increases the technological process for obtaining the blade stamping, as well as the low heating temperature (about 700 ° C) of the billet and dies contributes to a significant increase in the β phase of the titanium alloy and increase the alloy deformation resistance, which is accompanied by high contact stresses and, as a consequence, the deformation of the punch tool.
The technical result to which the invention is directed is to reduce the deformation resistance of the wrought alloy and, as a result, increase the dimensional stability of the dies.
The technical result is achieved by the fact that in the method of manufacturing stampings of blades made of titanium alloys, which includes extruding a workpiece in isothermal conditions at the same heating temperature of the workpiece and the stamp and subsequent isothermal stamping of the extruded workpiece, extrusion and isothermal stamping is carried out at a heating temperature of the stamp and workpiece 800-830 ° C ± 40 ° C at an average strain rate of not more than 0.3 mm / s.
The invention is illustrated by the drawing, which shows the microstructure of the obtained stamping from VT6 alloy.
The method is as follows.
A cylindrical titanium alloy billet is heated to a temperature of 800-830 ° C ± 40 ° C and placed in a matrix container. Moreover, the deforming tool must be heated to the stamping temperature, that is, to 800-830 ° C ± 40 ° C.
If the workpiece is heated to a temperature below 800 ° C, then during deformation, the deformation resistance increases significantly, which leads to significant wear of the die tooling (matrix point) and the formation of a defective workpiece for further stamping (possibly the formation of press weights, delamination of the workpiece), in addition , as a result of deformation heating in a wrought alloy, grain growth and release of the β phase in the form of plates occur, which increases the deformation resistance and reduces the plastic properties of the alloy.
If the workpiece and the deforming tool are heated above 830 ° C, formation of a fine-grained structure is not observed, as a result of which the deformation resistance of the wrought alloy increases and the strength characteristics of the die tool are reduced and, as a result, its resistance decreases.
Then carry out the operation of extrusion of the workpiece in isothermal conditions. In this case, the average strain rate should be no more than 0.3 mm / s. Compliance with these conditions ensures the formation of a fine-grained structure and a decrease in deformation resistance.
If the strain rate is more than 0.3 mm / s, then during the extrusion in the microstructure of the obtained workpiece, the β-phase of the titanium alloy is released, which significantly increases the deformation resistance, and also the grain of the titanium alloy increases.
After extrusion, isothermal stamping is carried out, and the dies and tool are also heated to a temperature of 800-830 ° C ± 40 ° C. Stamping is also carried out with an average strain rate of not more than 0.3 mm / s.
An example implementation of the method.
As an example, we took a cylindrical billet made of VT6 titanium alloy with dimensions: diameter 25 mm, height 35 mm.
The billet was heated to a temperature of 830 ° C, placed in a container of a stamp for extrusion, and the stamp itself was heated to a temperature of 830 ± 40 ° C. Extrusion was carried out with an average strain rate of 0.1 mm / s.
Then, the resulting blank was placed in the stamp. The temperature of the stamp and the workpiece was 820 ± 40 ° C. After stamping in isothermal conditions with an average strain rate of 0.1 mm / s, the blades from VT6 alloy were stamped.
Metallographic studies of the samples were carried out on an inverted metallographic microscope EPIPHOT 200 f.Nikon at a magnification of 500 (drawing).
According to the drawing it is seen that the microstructure of the stamping of the blade made of VT6 alloy is homogeneous fine-grained, with a small content of β-phase.
Thus, in the proposed method for the manufacture of stampings of blades made of titanium alloys, including extrusion of a workpiece in isothermal conditions at the same heating temperature of the workpiece and the stamp and subsequent isothermal stamping of the extruded workpiece, extrusion and isothermal stamping is carried out at a heating temperature of the stamp and workpiece 800-830 ° C ± 40 ° C at an average strain rate of not more than 0.3 mm / s, which allows to reduce the deformation resistance of the wrought alloy and, as a result, increase the dimensional resistance s stamps, as well as to receive the fine-grained structure of the blade forming.

Claims (1)

  1. A method of manufacturing stampings of blades made of titanium alloys, including extruding a workpiece under isothermal conditions at the same heating temperature of the workpiece and stamp and subsequent isothermal stamping of the extruded workpiece, characterized in that the extrusion and isothermal stamping is carried out at a heating temperature of the stamp and workpiece 800-830 ° C ± 40 ° C at an average strain rate of not more than 0.3 mm / s.
RU2016112814A 2016-04-04 2016-04-04 Method of blades forgings manufacturing from titanium alloys RU2614294C1 (en)

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RU2614294C1 true RU2614294C1 (en) 2017-03-24

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2255136C1 (en) * 2003-12-29 2005-06-27 Федеральное государственное унитарное предприятие "Московское машиностроительное производственное предприятие "Салют" Method of plastic working of the high-temperature resistant alloys bars used for production of gas-turbine engine compressor blades
RU2395936C1 (en) * 2008-12-16 2010-07-27 Объединенный Институт Ядерных Исследований Method of generating accelerating voltage in charged particle resonance accelerator
US20110189026A1 (en) * 2007-10-27 2011-08-04 Mtu Aero Engines Gmbh Material for a gas turbine component, method for producing a gas turbine component and gas turbine component
RU2486275C1 (en) * 2012-05-24 2013-06-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Уфимский государственный авиационный технический университет" Method to produce ultra-fine grain blank of gte blade of titanium alloys
US20150013144A1 (en) * 2013-07-10 2015-01-15 Alcoa Inc. Methods for producing forged products and other worked products

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2255136C1 (en) * 2003-12-29 2005-06-27 Федеральное государственное унитарное предприятие "Московское машиностроительное производственное предприятие "Салют" Method of plastic working of the high-temperature resistant alloys bars used for production of gas-turbine engine compressor blades
US20110189026A1 (en) * 2007-10-27 2011-08-04 Mtu Aero Engines Gmbh Material for a gas turbine component, method for producing a gas turbine component and gas turbine component
RU2395936C1 (en) * 2008-12-16 2010-07-27 Объединенный Институт Ядерных Исследований Method of generating accelerating voltage in charged particle resonance accelerator
RU2486275C1 (en) * 2012-05-24 2013-06-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Уфимский государственный авиационный технический университет" Method to produce ultra-fine grain blank of gte blade of titanium alloys
US20150013144A1 (en) * 2013-07-10 2015-01-15 Alcoa Inc. Methods for producing forged products and other worked products

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