CN101476096A - Method for processing Ti-6Al-4V titanium alloy large size bar material - Google Patents

Method for processing Ti-6Al-4V titanium alloy large size bar material Download PDF

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Publication number
CN101476096A
CN101476096A CNA2008102323651A CN200810232365A CN101476096A CN 101476096 A CN101476096 A CN 101476096A CN A2008102323651 A CNA2008102323651 A CN A2008102323651A CN 200810232365 A CN200810232365 A CN 200810232365A CN 101476096 A CN101476096 A CN 101476096A
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forging
fire
bar
temperature
titanium alloy
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CNA2008102323651A
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CN101476096B (en
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王韦琪
冯永琦
贾栓孝
王永梅
李渭清
张平辉
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宝鸡钛业股份有限公司
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Abstract

The invention relates to a large-scale processing method of Ti-6Al-4V titanium alloy rod bars with the phi of 200-400mm and the length of over 3000mm. The technique is characterized by adopting Ti-6Al-4V titanium alloy casting ingots with the phi of 700-950 mm, a gas furnace for heating and heat preserving at 1150 DEG C, a hydraulic press for hammer cogging, and adopting multi-heating number smithing over the beta transition temperature with the whole smithing ratio not smaller than 3; heating and smithing below the beta transition temperature by 20-30 DEG C with a smithing ratio of 1.5-1.8; preserving the heat for 0.5-3 hours over the beta transition temperature by 20 DEG C, water cooling, performing homogenization treatment; finally heating below the beta transition temperature by 30-50 DEG C, performing multi-heating number smithing in the alpha+beta phase section to the finished product format and the total forging ratio of the alpha+beta phase section being not less than 6. The weight of a single rod bar is greatly improved through integral smithing of casting ingots/large-scale smithing stocks, the length of the rod bar can reach more than 3 m and the rod bars have favorable tissue and performance.

Description

Ti-6Al-4V titanium alloy large size bar working method

Technical field

The present invention relates to a kind of Ti-6Al-4V titanium alloy large size bar working method, belong to the titanium alloy material technical field, be specially the processing technology of the Ti-6Al-4V titanium alloy large size bar of above, high tissue of diameter 200~400mm, length 3000mm and performance requriements, product is mainly used in important use such as Aeronautics and Astronautics.

Background technology

Advantages such as titanium alloy has the specific tenacity height, resistance to corrosion is strong, high-temperature behavior is good, workability is good are the important materials that use in fields such as Aeronautics and Astronautics, weapons.Aircraft industry is the main application fields of titanium alloy, and Ti-6Al-4V (trade mark is TC4 in China's national standard) is the alloy designations of consumption maximum, accounts for about 70% of titanium alloy ultimate production, is mainly used in the structural part of aircraft.Along with the development of aircraft industry, for safe reliability, prolongs life, the raising structure benefit that improves aircraft, the development trend of airplane design is to reduce welding, the employing heavy froging of load spare and large-scale integral forging.For satisfying development, the production of heavy froging and large-scale integral forging, need to use high quality, large-size titanium alloy bar.Yet, in the above bar production method of Ti-6Al-4V titanium alloy Φ 100mm, need adopt upsetting pull repeatedly to forge at home for guaranteeing tissue, performance uniformity and meeting the requirements.And the forged realization of upsetting pull is to rely on artificial clamping complete operation, thereby be subjected to the restriction of upsetting pull forging operation method, make that the cycle of the above bar production of domestic Ti-6Al-4V titanium alloy Φ 100mm is long, the bar substance is less, the quality product consistence is relatively poor, and the UT (Ultrasonic Testing) rank is low.The diameter of rod of suitability for industrialized production and application is Φ 220mm to the maximum at present, and single Zhi Changdu only has about 1.5 meters, is difficult to satisfy the demand in fields such as domestic and international Aeronautics and Astronautics, naval vessel.Though domestic many units have carried out the development of the above scale rod bar of Φ 220mm, but still be confined to little blank upsetting pull forging manufacturing technique repeatedly, bar length is difficult to improve, and tissue, UT (Ultrasonic Testing) and quality conformance etc. require still to exist bigger gap.

Summary of the invention

The technical problem that solves

For fear of the deficiencies in the prior art part, the Ti-6Al-4V titanium alloy large size bar working method that the present invention proposes makes that forging production process realizes mechanized operation, has reduced manually-operated randomness, batch quality conformance height, the production cycle significantly shortens.

Technical scheme

Basic thought of the present invention is: replace the upsetting pull forging repeatedly of little substance blank with ingot casting, forging stock solid forging, choose reasonable heating and forging temperature, coupling is forged parameters such as draught, feed, increase the transverse deformation of metal, control β phase region and the forged reasonable deflection of alpha+beta two-phase region, and adopt suitable high-temperature homogenization to handle, thereby obtain tissue and performance uniformity, UT (Ultrasonic Testing) clutter level height, the Ti-6Al-4V titanium alloy large size bar more than diameter 200~400mm, the length 3000mm.

Ti-6Al-4V titanium alloy large size bar working method of the present invention is characterized in that step is as follows:

Step 1 cogging is forged: adopt gas furnace with 1150 ℃~1200 ℃ of the Ti-6Al-4V titan alloy casting ingot heat tracings of Φ 700~950mm specification, forge 2~3 fire with water pressure engine in the above cogging of beta transus temperature then, 950 ℃ of final forging temperatures, every fire time forging ratio is not less than 1.5, and total forging ratio is not less than 3;

Forge in the middle of the step 2: adopt forging stock temperature that electric furnace heating steps 1 finishes below beta transus temperature 20~50 ℃, use dydraulic forging, forging ratio is 1.5~1.8;

Step 3 homogenizing is handled: adopt electric furnace heating forging stock to make that furnace temperature is above 20 ℃~30 ℃ an of beta transus temperature, insulation 0.5~3h entered tank and carries out water cooling with interior forging stock is come out of the stove from electric furnace at 20 seconds then;

Step 4: the forging stock that step 3 is finished is heated to be below the beta transus temperature 30~50 ℃, adopts water pressure engine alpha+beta two-phase region to forge 3~5 fire, and final forging temperature is not less than 800 ℃, and the total forging ratio of two-phase region is not less than 6.

But direct heating after every fire is forged in the step 4, insulation back continue next fire and forge.

Every fire time forging time is no more than 10~12 minutes in the step 4.

Beneficial effect

The Ti-6Al-4V titanium alloy large size bar working method that the present invention proposes, adopt ingot casting/large-scale forging stock solid forging, compare with existing small dimension blank upsetting pull forging manufacturing technique repeatedly, under the restricted condition of upsetting pull distortion blank aspect ratio, the substance of bar significantly improves, and can stablize to reach more than 3 meters.According to the deformation rule in the stress metal processing, select suitable opening to forge and final forging temperature, the rational Match processing parameter, the restriction metal flows along its length in forging process, promote metal in laterally fully distortion, increase and forge saturating property, improve the practical distortion amount and the deformation uniformity of large scale rod bar, thereby obtain to be out of shape tissue abundant, uniformity, and guarantee the product performance requirement.With existing spillikin base upsetting pull forging manufacturing technique repeatedly relatively, can effectively reduce the nonaffine deformation in the upsetting pull process, and forging defect causes single display signals to exceed standard and tissue odds is even causes clutter to exceed standard, thereby improves the UT (Ultrasonic Testing) level of bar.

Adopt Ti-6Al-4V titanium alloy Φ 200~400mm large scale rod bar that the present invention produced, meet the like product international advanced standard, its technical requirements is as follows:

The horizontal room-temperature mechanical property of bar meets the requirement of following table

The bar UT (Ultrasonic Testing) meets the regulation of following table

Diameter of rod (mm) The single display signals of UT (Ultrasonic Testing) is not more than 200~300 Φ1.2mm >300~400 Φ2.0mm

Horizontal high and low times of tissue of bar pressed the collection of illustrative plates grading of GJB1538-92, and meets the following table requirement

Description of drawings

The horizontal macrostructure figure of the bar of Fig. 1: embodiment 1

The horizontal micro-organization chart of the bar of Fig. 2: embodiment 1

A: central position; The b:1/2R position; C: limit portion position

The horizontal macrostructure figure of the bar of Fig. 3: embodiment 2

The horizontal micro-organization chart of the bar of Fig. 4: embodiment 2

A: central cross position; The b:R/4 horizontal position; The c:1/2R horizontal position; D:3/4R horizontal position e: limit portion horizontal position;

The horizontal macrostructure figure of the bar of Fig. 5: embodiment 3

The horizontal micro-organization chart of the bar of Fig. 6: embodiment 3

A: central cross position; The b:R/4 horizontal position; The c:1/2R horizontal position; D:3/4R horizontal position e: limit portion horizontal position;

Embodiment

Now in conjunction with the accompanying drawings the present invention is further described:

Embodiment 1:

Material processed is the ingot casting of ingot numbers 534-20050636 in the present embodiment, and diameter is 710mm.By working method of the present invention,, produce Φ 210mm bar through forging and thermal treatment.

Step 1 cogging is forged: adopts gas furnace with 1150 ℃ of the Ti-6Al-4V titan alloy casting ingot heat tracings of Φ 710mm specification, forges 2 fire with water pressure engine in the above cogging of beta transus temperature then, and 950 ℃ of final forging temperatures, every fire time forging ratio is not less than 1.6;

Forge in the middle of the step 2: adopt forging stock temperature that electric furnace heating steps 1 finishes below beta transus temperature 20 ℃, use dydraulic forging, forging ratio is 1.5;

Step 3 homogenizing is handled: adopt electric furnace heating forging stock to make that furnace temperature is above 20 ℃ an of beta transus temperature, insulation 2h entered tank and carries out water cooling with interior forging stock is come out of the stove from electric furnace at 20 seconds then;

Step 4: the forging stock that step 3 is finished is heated to be below the beta transus temperature 30 ℃, adopts water pressure engine alpha+beta two-phase region to forge 4 fire, and every fire time forging ratio is 1.6, and every fire time forging time was controlled in 12 minutes, and final forging temperature is not less than 800 ℃.Every fire is forged the back direct heating, and the insulation back is continued next fire and forged.

Bar performance, tissue to embodiment detect, and the result is as follows:

(1) bar room-temperature mechanical property

(2) high and low times of tissue of bar

The horizontal macrostructure of bar as shown in Figure 1, homogeneous microstructure, abnormal structures such as no coarse-grain are rated the B3 level by Fig. 2 of GJB1538-92, meet the grading regulation of B1~B9 in the technical requirements.

The horizontal microstructure of bar such as Fig. 2, Fig. 4 grading of pressing GJB1538-92, as seen better in transverse section different positions homogeneity.Figure a is the central position, and figure b is the 1/2R position, and figure c is limit portion position, all meets the B3 level, meets the grading regulation of B1 in the technical requirements~B19 level fully.

(3) bar UT (Ultrasonic Testing)

Probe with 5,000,000, full sound path carry out UT (Ultrasonic Testing), and bar is all by Φ 1.2mm flat-bottom hole.

Embodiment 2:

Material processed is the ingot casting of ingot numbers 534-20070732 in the present embodiment, and diameter is 820mm.By working method of the present invention,, produce Φ 350mm bar through forging and thermal treatment.

Step 1 cogging is forged: adopts gas furnace with 1150 ℃ of the Ti-6Al-4V titan alloy casting ingot heat tracings of Φ 820mm specification, forges 3 fire with water pressure engine in the above cogging of beta transus temperature then, and 950 ℃ of final forging temperatures, every fire time forging ratio is not less than 1.5;

Forge in the middle of the step 2: adopt forging stock temperature that electric furnace heating steps 1 finishes below beta transus temperature 20 ℃, use dydraulic forging, forging ratio is 1.5;

Step 3 homogenizing is handled: adopt electric furnace heating forging stock to make that furnace temperature is above 20 ℃ an of beta transus temperature, insulation 2h entered tank and carries out water cooling with interior forging stock is come out of the stove from electric furnace at 20 seconds then;

Step 4: the forging stock that step 3 is finished is heated to be below the beta transus temperature 30 ℃, adopts water pressure engine alpha+beta two-phase region to forge 4 fire, and every fire time forging ratio is 1.6, and every fire time forging time was controlled in 12 minutes, and final forging temperature is not less than 800 ℃.Every fire is forged the back direct heating, and the insulation back is continued next fire and forged.

Bar performance, tissue to embodiment detect, and the result is as follows:

(1) Φ 350mm bar room-temperature mechanical property

(2) high and low times of tissue of bar

The horizontal macrostructure of bar is evenly seen Fig. 3, does not see abnormal structures such as coarse-grain, is rated the B4 level by Fig. 2 of GJB1538-92, meets the grading regulation of B1~B9 in the technical requirements fully.

The horizontal microstructure of bar is seen Fig. 4, presses Fig. 4 grading of GJB1538-92.Figure a is the central cross position, and figure b is the R/4 horizontal position, and figure c is the 1/2R horizontal position, and figure d is the 3/4R horizontal position, and figure e is limit portion horizontal position, all meets the B4 level, and homogeneity of structure is fine, meets the grading regulation of B1~B19 in the technical requirements fully.

(3) bar UT (Ultrasonic Testing)

Probe with 5,000,000, full sound path carry out UT (Ultrasonic Testing) to bar, all by Φ 2.0mm flat-bottom hole, meet technical requirements.

Embodiment 3:

Material processed is the ingot casting of ingot numbers 534-20071540 in the present embodiment, and diameter is 940mm.By working method of the present invention,, produce Φ 400mm bar through forging and thermal treatment.

Step 1 cogging is forged: adopts gas furnace with 1150 ℃ of the Ti-6Al-4V titan alloy casting ingot heat tracings of Φ 940mm specification, forges 2 fire with water pressure engine in the above cogging of beta transus temperature then, and 950 ℃ of final forging temperatures, every fire time forging ratio is not less than 1.6;

Forge in the middle of the step 2: adopt forging stock temperature that electric furnace heating steps 1 finishes below beta transus temperature 20 ℃, use dydraulic forging, forging ratio is 1.5;

Step 3 homogenizing is handled: adopt electric furnace heating forging stock to make that furnace temperature is above 20 ℃ an of beta transus temperature, insulation 2h entered tank and carries out water cooling with interior forging stock is come out of the stove from electric furnace at 20 seconds then;

Step 4: the forging stock that step 3 is finished is heated to be below the beta transus temperature 30 ℃, adopts water pressure engine alpha+beta two-phase region to forge 4 fire, and every fire time forging ratio is 1.6, and every fire time forging time was controlled in 12 minutes, and final forging temperature is not less than 800 ℃.Every fire is forged the back direct heating, and the insulation back is continued next fire and forged.

Bar performance, tissue to embodiment detect, and the result is as follows:

Bar performance, tissue are detected, and the result is as follows:

(1) rod mechanical performance

(2) high and low times of tissue of bar

The horizontal macrostructure of bar is evenly seen Fig. 5, does not see abnormal structures such as coarse-grain, is rated the B3 level by Fig. 2 of GJB1538-92, meets the grading regulation of B1~B9 in the technical requirements fully.

The horizontal microstructure of bar is seen Fig. 6.To limit portion different sites, the homogeneity of structure of bar is fine from the center of circle, transverse section for bar.Press Fig. 4 grading of GJB1538-92, figure a is the central cross position, and figure b is the R/4 horizontal position, and figure c is the 1/2R horizontal position, and figure d is the 3/4R horizontal position, is the B6 level; Figure e is limit portion horizontal position, is the B8 level, meets the grading regulation of B1~B19 in the technical requirements fully.

(3) bar UT (Ultrasonic Testing)

Bar carries out UT (Ultrasonic Testing) with 5,000,000 probe, full sound path, can pass through Φ 2.0mm flat-bottom hole, and the clutter level is-9dB~-6dB.

Claims (3)

1. Ti-6Al-4V titanium alloy large size bar working method is characterized in that step is as follows:
Step 1 cogging is forged: adopt gas furnace with 1150 ℃~1200 ℃ of the Ti-6Al-4V titan alloy casting ingot heat tracings of Φ 700~950mm specification, forge 2~3 fire with water pressure engine in the above cogging of beta transus temperature then, 950 ℃ of final forging temperatures, every fire time forging ratio is not less than 1.5, and total forging ratio is not less than 3;
Forge in the middle of the step 2: adopt forging stock temperature that electric furnace heating steps 1 finishes below beta transus temperature 20~50 ℃, use dydraulic forging, forging ratio is 1.5~1.8;
Step 3 homogenizing is handled: adopt electric furnace heating forging stock to make that furnace temperature is above 20 ℃~30 ℃ an of beta transus temperature, insulation 0.5~3h entered tank and carries out water cooling with interior forging stock is come out of the stove from electric furnace at 20 seconds then;
Step 4: the forging stock that step 3 is finished is heated to be below the beta transus temperature 30~50 ℃, adopts water pressure engine alpha+beta two-phase region to forge 3~5 fire, and final forging temperature is not less than 800 ℃, and the total forging ratio of two-phase region is not less than 6.
2. Ti-6Al-4V titanium alloy large size bar working method according to claim 1 is characterized in that: every fire is forged the back direct heating in the step 4, and the insulation back is continued next fire and forged.
3. Ti-6Al-4V titanium alloy large size bar working method according to claim 1 is characterized in that: every fire time forging time is no more than 10~12 minutes in the step 4.
CN2008102323651A 2008-11-21 2008-11-21 Method for processing Ti-6Al-4V titanium alloy large size bar material CN101476096B (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101934341A (en) * 2010-09-20 2011-01-05 宝鸡市利泰有色金属有限公司 Forging technology of TC4 titanium alloy cylindrical part
CN102133641A (en) * 2011-04-19 2011-07-27 广州有色金属研究院 Powder metallurgy method of Ti-6Al-4V alloy
CN102230145A (en) * 2011-06-20 2011-11-02 西部钛业有限责任公司 Method for producing TC25 two-phase titanium alloy rod material with large specification
CN102418060A (en) * 2011-12-12 2012-04-18 西部钛业有限责任公司 Processing method for TC4 titanium alloy large-sized bar
CN102581188A (en) * 2012-02-29 2012-07-18 湖南金天钛业科技有限公司 Method for machining TC4-DT titanium alloy large-specification slab forged piece
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
CN102922239A (en) * 2012-11-13 2013-02-13 西部钛业有限责任公司 Preparation method for TA5 titanium alloy bars with small specifications
CN104070125A (en) * 2014-03-11 2014-10-01 宁夏东方钽业股份有限公司 Forging machining method of large-sized bar materials of TC4 (Ti-6Al-4V) titanium alloy
CN104762576A (en) * 2015-04-24 2015-07-08 西北有色金属研究院 Method for manufacturing TC18 titanium alloy whole basket-weave microstructure medium-specification ultra-long bars
CN104878245A (en) * 2015-04-23 2015-09-02 西安赛特思迈钛业有限公司 Biomedical high-strength and toughness Ti-6Al-4V titanium alloy bar and preparation method thereof
CN103586380B (en) * 2013-11-08 2015-09-16 中国航空工业集团公司北京航空材料研究院 A kind of ingot formation Forging Technology improving titanium alloy forging stock structural homogenity
CN104923968A (en) * 2015-06-24 2015-09-23 宝鸡钛业股份有限公司 Special Ti-6Al-3V welding wire for Ti-6Al-4V ELI titanium alloy and machining process of special Ti-6Al-3V welding wire
CN109371268A (en) * 2018-09-30 2019-02-22 中国科学院金属研究所 A kind of preparation method of high temperature, high thermal stability, high creep resistance titanium alloy rod bar

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101934341A (en) * 2010-09-20 2011-01-05 宝鸡市利泰有色金属有限公司 Forging technology of TC4 titanium alloy cylindrical part
CN102133641B (en) * 2011-04-19 2012-10-24 广州有色金属研究院 Powder metallurgy method of Ti-6Al-4V alloy
CN102133641A (en) * 2011-04-19 2011-07-27 广州有色金属研究院 Powder metallurgy method of Ti-6Al-4V alloy
CN102230145A (en) * 2011-06-20 2011-11-02 西部钛业有限责任公司 Method for producing TC25 two-phase titanium alloy rod material with large specification
CN102418060A (en) * 2011-12-12 2012-04-18 西部钛业有限责任公司 Processing method for TC4 titanium alloy large-sized bar
CN102581188A (en) * 2012-02-29 2012-07-18 湖南金天钛业科技有限公司 Method for machining TC4-DT titanium alloy large-specification slab forged piece
CN102581188B (en) * 2012-02-29 2014-07-30 湖南金天钛业科技有限公司 Method for machining TC4-DT titanium alloy large-specification slab forged piece
CN102641978B (en) * 2012-05-17 2014-06-11 湖南金天钛业科技有限公司 Method for processing TC18 titanium alloy large-sized section bar
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
CN102922239A (en) * 2012-11-13 2013-02-13 西部钛业有限责任公司 Preparation method for TA5 titanium alloy bars with small specifications
CN103586380B (en) * 2013-11-08 2015-09-16 中国航空工业集团公司北京航空材料研究院 A kind of ingot formation Forging Technology improving titanium alloy forging stock structural homogenity
CN104070125A (en) * 2014-03-11 2014-10-01 宁夏东方钽业股份有限公司 Forging machining method of large-sized bar materials of TC4 (Ti-6Al-4V) titanium alloy
CN104070125B (en) * 2014-03-11 2016-08-17 宁夏东方钽业股份有限公司 A kind of forging processing method of TC4 titanium alloy large size bar
CN104878245B (en) * 2015-04-23 2017-04-19 西安赛特思迈钛业有限公司 Biomedical high-strength and toughness Ti-6Al-4V titanium alloy bar and preparation method thereof
CN104878245A (en) * 2015-04-23 2015-09-02 西安赛特思迈钛业有限公司 Biomedical high-strength and toughness Ti-6Al-4V titanium alloy bar and preparation method thereof
CN104762576B (en) * 2015-04-24 2016-10-12 西北有色金属研究院 The preparation method of TC18 titanium alloy the whole network basket tissue medium format overlength bar
CN104762576A (en) * 2015-04-24 2015-07-08 西北有色金属研究院 Method for manufacturing TC18 titanium alloy whole basket-weave microstructure medium-specification ultra-long bars
CN104923968A (en) * 2015-06-24 2015-09-23 宝鸡钛业股份有限公司 Special Ti-6Al-3V welding wire for Ti-6Al-4V ELI titanium alloy and machining process of special Ti-6Al-3V welding wire
CN109371268A (en) * 2018-09-30 2019-02-22 中国科学院金属研究所 A kind of preparation method of high temperature, high thermal stability, high creep resistance titanium alloy rod bar

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