CN104480416A - Cross-phase region forging process of TC18 titanium alloy on screw press - Google Patents

Cross-phase region forging process of TC18 titanium alloy on screw press Download PDF

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Publication number
CN104480416A
CN104480416A CN201410702805.0A CN201410702805A CN104480416A CN 104480416 A CN104480416 A CN 104480416A CN 201410702805 A CN201410702805 A CN 201410702805A CN 104480416 A CN104480416 A CN 104480416A
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CN
China
Prior art keywords
forging
bar
phase region
screw press
beta
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CN201410702805.0A
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Chinese (zh)
Inventor
黄定辉
陈瑞钢
赵顺峰
李晓婷
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无锡透平叶片有限公司
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Priority to CN201410702805.0A priority Critical patent/CN104480416A/en
Publication of CN104480416A publication Critical patent/CN104480416A/en

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    • 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

The invention provides a cross-phase region forging process of a TC18 titanium alloy on a screw press. By adopting the cross-phase region forging process, cross-phase region forging on TC18 titanium allay large-size die forgings by multiple heating numbers on an electric screw press can be realized, and die forgings can obtain uniform mesh basket knitted structures with excellent performance. The cross-phase region forging process comprises the following processing steps: firstly, feeding, and carrying out beta-phase region forging on a bar by virtue of the electric screw press; heating the bar to the temperature (T<beta>-30 to T<beta>-50) DEG C below the phase transformation point, and carrying out heat preservation; heating the bar toT<beta>+20) DEG C along with a furnace, and carrying out heat preservation; transferring the bar to the screw press to forge while controlling the forging deformation to be 35%-60%; carrying out alpha+beta two-phase region forging on the bar by virtue of the screw press, heating the bar to (alpha+beta) two-phase region temperature (T<beta>-30 to T<beta>-50) DEG C, and carrying out heat preservation; transferring the bar to a die cavity of the screw press, carrying out two-phase region die forging while controlling the die forging deformation within 30%, so as to obtain forgings; and finally carrying out thermal treatment on the forgings.

Description

A kind of TC18 titanium alloy on screw press across phase region forging process

Technical field

The present invention relates to the technical field of hot working of metallic substance, especially relate to the technical field of forging of titanium alloy material, be specially a kind of TC18 titanium alloy on screw press across phase region forging process.

Background technology

Titanium alloy because specific tenacity is high, excellent combination property and be widely used in aerospace field, in four kinds of structural states of wherein titanium alloy, basket tissue and tissue can meet modern aircraft design high damage tolerance theory, particularly uniform weave side by side basket tissue can obtain higher K iCvalue, the method that TC18 titanium alloy adopts accurate β to forge usually to obtain basket tissue, to obtain over-all properties preferably basket tissue.But there is following two problems in the titanium alloy large-sized stamp work of current TC18 in actual production process:

(1) existingly mostly carry out on open die forgings the experiment of TC18 titanium alloy processing parameter, the experimental result regularity drawn is strong, has little significance to the operation instruction of the titanium alloy large-sized stamp work of actual TC18;

(2) the titanium alloy large-sized structure stamp work of TC18 is difficult to adopt quasi-beta forging process one fire forging strike to be put in place, general needs divide fire to carry out across the many fire of phase region time forging and molding at β phase region and alpha+beta two-phase region, the hydraulic press that adopts carries out accurate β forging and molding to TC18 titanium alloy more at present, but there is the more difficult control aborning of quasi-beta forging process parameter in it, the less stable of microstructure and property, accompanying drawing 1 is shown in the unstable citing of common TC18 titanium alloy quasi-beta forging tissue.

Summary of the invention

For the problems referred to above, the invention provides a kind of TC18 titanium alloy on screw press across phase region forging process, it can overcome the titanium alloy large-sized stamp work of current TC18 and in actual production process, test the processing parameter obtained by flat-die forging be not suitable for the problem that die forging produces, and can solve the more difficult control and cause the problem of the poor stability of the microstructure and property of forging aborning of quasi-beta forging process parameter.

Its technical scheme is as follows:

TC18 titanium alloy on screw press across a phase region forging process, it comprises following processing step, first, blanking; Then electric screw press is adopted to carry out the forging of β phase region to bar; Again adopt screw press to carry out the die forging of alpha+beta two-phase region to described bar, obtain forging; Finally described forging is heat-treated, it is characterized in that: the described concrete operations carrying out the forging of β phase region to bar are first bar is heated to the following temperature (T of transformation temperature β-30 ~ 50) DEG C to temperature insulation, then described bar is warming up to (T with stove β+ 20) DEG C and be incubated, then be transferred on screw press by described bar and forge, forging deformation amount controls 35% ~ 60%;

The described concrete operations carrying out the die forging of alpha+beta two-phase region to bar are described bar is heated to (alpha+beta) two-phase region temperature (T β-30 ~ 50) DEG C and be incubated, be then transferred in screw press die cavity by described bar and carry out two-phase region die forging, die forging deformation amount controlling is within 30%.

It is further characterized in that:

Wherein said bar is transferred to time controling described screw press within 40 seconds from electric furnace;

In described β phase region forging, bar is heated to the following temperature (T of transformation temperature β-30 ~ 50) DEG C (alpha+beta) two-phase region temperature (T is heated to bar in soaking time, alpha+beta two-phase region die forging process after temperature β-30 ~ 50) soaking time DEG C all calculates according to (the maximum net thickness of heat insulating coefficient 0.7min/mm × bar);

Describedly bar in β phase region forging process is carried out to bar be warming up to (T with stove β+ 20) soaking time DEG C is determined according to actual heat penetration test-results according to bar;

Described heat treated concrete operations are, described forging is heated to 835 DEG C and is incubated 3 hours, cool to 750 DEG C with the furnace and are incubated 2 hours, air cooling to room temperature, more described forging is heated to 600 DEG C and after being incubated 5 hours air cooling to room temperature.

Beneficial effect of the present invention is: it realizes the secondary processing method of the titanium alloy large-sized stamp work of TC18 being carried out to forge across phase region of point fire on electric screw press, making stamp work obtain the even basket knit stitches of excellent performance by arranging rational processing parameter, meeting the requirement of modern aircraft design theory.

Accompanying drawing explanation

Fig. 1 is the excessive forging microstructure picture of current TC18 titanium alloy two-phase region forging deformation amount;

Fig. 2 is the too high forging microstructure picture of current TC18 titanium alloy beta phase region forging deformation quantity not sufficient or temperature;

Fig. 3 is according to present invention process forge mould forging microstructure picture one on screw press according to the present invention;

Fig. 4 is according to present invention process forge mould forging microstructure picture two on screw press according to the present invention.

Embodiment

Embodiment one:

TC18 titanium alloy on screw press across a phase region forging process, it comprises following processing step:

(1) blanking;

(2) electric screw press is adopted to carry out the forging of β phase region to bar: first bar to be heated to (T β-30) DEG C be incubated to temperature, then bar be warming up to (T with stove β+ 20) DEG C and be incubated, then be transferred on screw press by bar and forge, the time controling that bar is transferred to screw press from electric furnace controls within 40 seconds transfer time, and hammer number is 1 to hit, and forging deformation amount controls 45%;

(3) adopt screw press to carry out the die forging of alpha+beta two-phase region to described bar again, obtain forging: bar is heated to (alpha+beta) two-phase region temperature (T β-40) DEG C and be incubated, then bar is transferred in screw press die cavity and carries out two-phase region die forging, the time controling that bar is transferred to screw press from electric furnace controls within 40 seconds transfer time, and hammer number is 2 to hit ~ 3 to hit, and die forging total deformation controls within 30%;

(4) finally forging is heat-treated: forging be heated to 835 DEG C and be incubated 3 hours, cools to 750 DEG C with the furnace and be incubated 2 hours, air cooling to room temperature, more described forging is heated to 600 DEG C and after being incubated 5 hours air cooling to room temperature.

Embodiment two:

TC18 titanium alloy on screw press across a phase region forging process, it comprises following processing step:

(1) blanking;

(2) electric screw press is adopted to carry out the forging of β phase region to bar: first bar to be heated to (T β-50) DEG C be incubated to temperature, then bar be warming up to (T with stove β+ 20) DEG C and be incubated, then be transferred on screw press by bar and forge, the time controling that bar is transferred to screw press from electric furnace controls within 40 seconds transfer time, and hammer number is 1 to hit, and forging deformation amount controls 35%;

(3) adopt screw press to carry out the die forging of alpha+beta two-phase region to described bar again, obtain forging: bar is heated to (alpha+beta) two-phase region temperature (T β-30) DEG C and be incubated, then bar is transferred in screw press die cavity and carries out two-phase region die forging, the time controling that bar is transferred to screw press from electric furnace controls within 40 seconds transfer time, and hammer number is 2 to hit ~ 3 to hit, and die forging total deformation controls within 30%;

(4) finally forging is heat-treated: forging be heated to 835 DEG C and be incubated 3 hours, cools to 750 DEG C with the furnace and be incubated 2 hours, air cooling to room temperature, more described forging is heated to 600 DEG C and after being incubated 5 hours air cooling to room temperature.

Embodiment three:

TC18 titanium alloy on screw press across a phase region forging process, it comprises following processing step:

(1) blanking;

(2) electric screw press is adopted to carry out the forging of β phase region to bar: first bar to be heated to (T β-40) DEG C be incubated to temperature, then bar be warming up to (T with stove β+ 20) DEG C and be incubated, then be transferred on screw press by bar and forge, the time controling that bar is transferred to screw press from electric furnace controls within 40 seconds transfer time, and hammer number is 1 to hit, and forging deformation amount controls 60%;

(3) adopt screw press to carry out the die forging of alpha+beta two-phase region to described bar again, obtain forging: bar is heated to (alpha+beta) two-phase region temperature (T β-50) DEG C and be incubated, then bar is transferred in screw press die cavity and carries out two-phase region die forging, the time controling that bar is transferred to screw press from electric furnace controls within 40 seconds transfer time, and hammer number is 2 to hit ~ 3 to hit, and die forging total deformation controls within 30%;

(4) finally forging is heat-treated: forging be heated to 835 DEG C and be incubated 3 hours, cools to 750 DEG C with the furnace and be incubated 2 hours, air cooling to room temperature, more described forging is heated to 600 DEG C and after being incubated 5 hours air cooling to room temperature.

In above-mentioned three embodiments, in the forging of β phase region, bar is heated to the following temperature (T of transformation temperature β-30 ~ 50) DEG C (alpha+beta) two-phase region temperature (T is heated to bar in soaking time after temperature and alpha+beta two-phase region die forging process β-30 ~ 50) soaking time DEG C all calculates according to (the maximum net thickness of heat insulating coefficient 0.7min/mm × bar);

Describedly bar in β phase region forging process is carried out to bar be warming up to (T with stove β+ 20) soaking time DEG C is determined according to actual heat penetration test-results according to bar.

See the following form according to the mechanical performance data of present invention process forge mould forging on screw press:

Claims (5)

1. TC18 titanium alloy on screw press across a phase region forging process, it comprises following processing step, first, blanking; Then electric screw press is adopted to carry out the forging of β phase region to bar; Again adopt screw press to carry out the die forging of alpha+beta two-phase region to described bar, obtain forging; Finally described forging is heat-treated, it is characterized in that:
The described concrete operations carrying out the forging of β phase region to bar are first bar is heated to the following temperature (T of transformation temperature β-30 ~ 50) DEG C to temperature insulation, then described bar is warming up to (T with stove β+ 20) DEG C and be incubated, then be transferred on screw press by described bar and forge, forging deformation amount controls 35% ~ 60%;
The described concrete operations carrying out the die forging of alpha+beta two-phase region to bar are described bar is heated to (alpha+beta) two-phase region temperature (T β-30 ~ 50) DEG C and be incubated, be then transferred in screw press die cavity by described bar and carry out two-phase region die forging, die forging deformation amount controlling is within 30%.
2. a kind of TC18 titanium alloy according to claim 1 on screw press across phase region forging process, it is characterized in that: bar is transferred to time controling described screw press within 40 seconds from electric furnace.
3. a kind of TC18 titanium alloy according to claim 1 on screw press across phase region forging process, it is characterized in that: in the forging of described β phase region, bar is heated to the following temperature (T of transformation temperature β-30 ~ 50) DEG C (alpha+beta) two-phase region temperature (T is heated to bar in soaking time, alpha+beta two-phase region die forging process after temperature β-30 ~ 50) soaking time DEG C all calculates according to (the maximum net thickness of heat insulating coefficient 0.7min/mm × bar).
4. a kind of TC18 titanium alloy according to claim 1 on screw press across phase region forging process, it is characterized in that: describedly bar in β phase region forging process is carried out to bar be warming up to (T with stove β+ 20) soaking time DEG C is determined according to actual heat penetration test-results according to bar.
5. a kind of TC18 titanium alloy according to claim 1 on screw press across phase region forging process, it is characterized in that: described heat treated concrete operations are, described forging is heated to 835 DEG C and is incubated 3 hours, cool to 750 DEG C with the furnace and be incubated 2 hours, air cooling to room temperature, more described forging is heated to 600 DEG C and after being incubated 5 hours air cooling to room temperature.
CN201410702805.0A 2014-11-29 2014-11-29 Cross-phase region forging process of TC18 titanium alloy on screw press CN104480416A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106734838A (en) * 2016-12-01 2017-05-31 贵州安大航空锻造有限责任公司 TC17 titanium alloy tubular journal forging near isothermal forging manufacturing process
CN106734798A (en) * 2016-11-24 2017-05-31 郑州大学 A kind of hot die forming manufacturing process of titanium matter cavity liner
CN106984750A (en) * 2017-03-27 2017-07-28 宝鸡高新兴隆钛业有限公司 A kind of processing method of large-size titanium alloy bar
CN109261865A (en) * 2018-09-29 2019-01-25 西安飞机工业(集团)有限责任公司 A kind of quasi- β forging deformation control method of TC18 titanium alloy die forging part

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1403622A (en) * 2001-09-04 2003-03-19 北京航空材料研究院 Titanium alloy quasi-beta forging process
CN102641978A (en) * 2012-05-17 2012-08-22 湖南金天钛业科技有限公司 Method for processing TC18 titanium alloy large-sized section bar
CN103014574A (en) * 2012-12-14 2013-04-03 中南大学 Preparation method of TC18 ultra-fine grain titanium alloy

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1403622A (en) * 2001-09-04 2003-03-19 北京航空材料研究院 Titanium alloy quasi-beta forging process
CN102641978A (en) * 2012-05-17 2012-08-22 湖南金天钛业科技有限公司 Method for processing TC18 titanium alloy large-sized section bar
CN103014574A (en) * 2012-12-14 2013-04-03 中南大学 Preparation method of TC18 ultra-fine grain titanium alloy

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
黄定辉等: "准β锻造工艺对TC18钛合金组织与性能的影响", 《铸造》 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106734798A (en) * 2016-11-24 2017-05-31 郑州大学 A kind of hot die forming manufacturing process of titanium matter cavity liner
CN106734798B (en) * 2016-11-24 2019-07-16 郑州大学 A kind of hot die forming manufacturing process of titanium matter cavity liner
CN106734838A (en) * 2016-12-01 2017-05-31 贵州安大航空锻造有限责任公司 TC17 titanium alloy tubular journal forging near isothermal forging manufacturing process
CN106984750A (en) * 2017-03-27 2017-07-28 宝鸡高新兴隆钛业有限公司 A kind of processing method of large-size titanium alloy bar
CN106984750B (en) * 2017-03-27 2018-12-18 宝鸡高新兴隆钛业有限公司 A kind of processing method of large-size titanium alloy bar
CN109261865A (en) * 2018-09-29 2019-01-25 西安飞机工业(集团)有限责任公司 A kind of quasi- β forging deformation control method of TC18 titanium alloy die forging part

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