CN103695826A - Fine-grain forging method for large-size GH690 nickel-based alloy bar billet - Google Patents
Fine-grain forging method for large-size GH690 nickel-based alloy bar billet Download PDFInfo
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- CN103695826A CN103695826A CN201310714808.1A CN201310714808A CN103695826A CN 103695826 A CN103695826 A CN 103695826A CN 201310714808 A CN201310714808 A CN 201310714808A CN 103695826 A CN103695826 A CN 103695826A
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- 238000005242 forging Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 58
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 36
- 239000000956 alloy Substances 0.000 title claims abstract description 36
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title abstract 6
- 229910052759 nickel Inorganic materials 0.000 title abstract 3
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 235000015895 biscuits Nutrition 0.000 claims description 36
- 229910000831 Steel Inorganic materials 0.000 claims description 34
- 239000010959 steel Substances 0.000 claims description 34
- 239000013078 crystal Substances 0.000 claims description 11
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 9
- 238000005204 segregation Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 7
- 239000002131 composite material Substances 0.000 abstract 1
- 238000000265 homogenisation Methods 0.000 abstract 1
- 238000005461 lubrication Methods 0.000 abstract 1
- 150000001247 metal acetylides Chemical class 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 229910019589 Cr—Fe Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001098 inconels 690 Inorganic materials 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
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Abstract
The invention discloses a fine-grain forging method for a large-size GH690 nickel-based alloy bar billet, and belongs to the technical field of forging. By using the composite technology of ingot billet homogenization and classified forging for preparing the GH690 nickel-based alloy bar billet, the grains of the bar billet for forging can be uniform and fine, thus meeting fine-grain structure homogeneity control requirements on final large-size alloy forgings; classified repeated upsetting-stretching cogging is performed on the basis of controlling a deformation temperature and the deformation amount of each heating number, the forgings are formed by hot upsetting by virtue of end part lubrication and horizontal restrain technologies, and rapidly cooled to eliminate grain coarsening caused by deformation heat effect, and finally, the forging structures with uniform carbides and fine grains are obtained.
Description
Technical field
The invention belongs to technical field of forging, particularly relate to a kind of thin brilliant forging method of large size GH690 nickel-base alloy rod base.
Background technology
GH690 alloy (external corresponding trade mark Inconel690) is the anti-corrosion wrought superalloy of a kind of Ni-Cr-Fe base, and its nominal composition is (wt%) Ni-30Cr-10Fe.The Cr of high-content makes it under various working condition, have excellent corrosion resistance, and its variant production form especially large size alloy forged piece now obtains widespread use in fields such as nuclear power, space flight, naval vessel, petrochemical industry and building materials.Along with the development of the industrial technologies such as nuclear power, the harshness day by day of usage environment, requires this alloy forged piece not only should have high corrosion resistance energy, also should have higher tensile strength and fatigue property.And GH690 alloy only contains micro-C(0.01～0.04wt%) and Al, the Ti(≤0.5wt% of low levels) element, precipitation strength phase content is low, and the high-tensile and the fatigue property that therefore require should make large size alloy forged piece have even fine grain structure (refined crystalline strengthening).Yet, existing forging process is generally steel ingot to be processed to direct hammer cogging without homogenizing become a useful person, without upsetting pull process repeatedly, and Heating temperature is higher in forging process, fire time deflection is controlled not tight, makes the grain structure of this alloy large size intermediate blank (excellent base) for forging of producing thick, carbide is inhomogeneous, cause the even fine grained texture of final forging to control difficulty, lumber recovery is low, thus the unstable further application that has hindered alloy of use properties.Demand rapid growth along with the GH690 alloy forged piece of existing application, the demand of the more high performance large size GH690 nickel-base alloy forging that the industrial technology of new development adopts will be day by day urgent, and therefore invention stable large size GH690 nickel-base alloy forging will provide very important guarantee for the tremendous development of the industry such as China's nuclear power with the thin brilliant forging method of excellent base.
Summary of the invention
The object of the present invention is to provide a kind of thin brilliant forging method of large size GH690 nickel-base alloy rod base, with the recombining process that ingot blank homogenizing+classification is forged, make the thin crystal bar base of GH690 nickel-base alloy, can make described forging become evenly tiny with the crystal grain of excellent base, thereby meet fine grained texture's homogeneity control requirement of final large size alloy forged piece.Controlling on the basis of texturing temperature and each fire time deflection, carry out classification upsetting pull cogging repeatedly, adopt end to lubricate with lateral confinement technology and make forging heat forming, and the fast cooling grain coarsening causing to eliminate deformation heating, finally obtain carbide evenly, the forging tissue of grain refining.The technical parameter of controlling in concrete technology is as follows:
1, provide large size GH690 nickel-base alloy steel ingot (Φ 550～600mm), this steel ingot is carried out in heat treatment furnace to homogenizing processing tentatively to eliminate the segregation of Ti and C element;
2, heat this steel ingot, jumping-up obtains biscuit one time, then this biscuit pulling is obtained to secondary bar;
3, heat described secondary bar, then jumping-up obtains secondary biscuit, then this biscuit pulling is obtained to bar three times;
4, heat described three bars, then jumping-up obtains biscuit three times, then this biscuit pulling is obtained to four bars (intermediate blank bar);
5, heat described four bars (intermediate blank bar), by first forging and finish-forging, obtain thin crystal bar base.
In aforesaid method, every fire (complete once to heat and forge and be called a fire) deflection >=30%(maximum 50%).
Steel ingot described in step 1 preferably obtains by vacuum induction+esr duplex technique.Described homogenizing condition is (scope, for example (1100-1200 ℃) * (10-36h), be preferably 1180 ℃ * 36h.
Step 2 preferably realizes by following technique: first GH690 nickel-base alloy steel ingot is heated to 1130 ℃～1180 ℃ in process furnace, preferred range is 1160～1180 ℃, then on forging press, described steel ingot jumping-up is highly obtained to biscuit one time to 1/3～1/2 times of former steel ingot height.Again this biscuit pulling is changed back to 4/5～1 times of former steel ingot height and highly obtain secondary bar.
In aforesaid method, described jumping-up and pulling operation are all carried out on forging press.
Compared with prior art, beneficial effect of the present invention is as follows:
The thin brilliant forging method of a kind of large size GH690 nickel-base alloy rod base of the present invention, the recombining process that adopts ingot blank homogenizing+classification to forge, controlling on the basis of texturing temperature and each fire time deflection, carry out classification upsetting pull cogging repeatedly, and the fast cooling grain coarsening causing to eliminate deformation heating, finally obtain carbide evenly, the forging tissue of grain refining.This is the novel method that a kind of nickel-base alloy rod base that is applicable to low precipitation strength phase is produced.
Appearance of the present invention, makes the crystal grain of GH690 nickel-base alloy rod base become evenly tiny, thereby meets fine grained texture's homogeneity control requirement of final large size alloy forged piece.Improved the stability of lumber recovery and tissue, therefore invention stable large size GH690 nickel-base alloy forging will provide very important guarantee for the tremendous development of the industry such as China's nuclear power with the thin brilliant forging method of excellent base.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the process flow sheet of the thin brilliant forging method of large size GH690 nickel-base alloy rod base.
Fig. 2 is the sampling schematic diagram of the large size GH690 nickel-base alloy rod base of embodiment 1,2.
Fig. 3 is the interior tissue structure figure of the large size GH690 nickel-base alloy rod base of embodiment 1.
Fig. 4 is the interior tissue structure figure of the large size GH690 nickel-base alloy rod base of embodiment 2.
Embodiment
The thin brilliant forging method of implementing large size GH690 nickel-base alloy rod base of the present invention, need to provide the GH690 nickel-base alloy after homogenizing heat treatment furnace, forge furnace, forging press and esr original steel ingot.
Fig. 1 shows the technical process of the thin brilliant forging method of large size GH690 nickel-base alloy rod base, and specific embodiment is as follows.
Embodiment 1:
A kind of thin brilliant forging method step of large size GH690 nickel-base alloy rod base is as follows:
Step 1: homogenizing is processed.By GH690 nickel-base alloy steel ingot in heat treatment furnace, be heated to 1180 ℃ and insulation 36 hours.
Step 2: jumping-up.GH690 nickel-base alloy steel ingot after homogenizing is processed is heated to 1180 ℃ in process furnace, then on forging press, described steel ingot jumping-up is highly obtained to biscuit one time to 1/2 times of former steel ingot height.A described biscuit pulls out the height that changes back to former steel ingot and obtains secondary bar on forging press.
Step 3: the secondary bar described in step 2 is heated to 1180 ℃ in process furnace, then on forging press described secondary bar again jumping-up to 1/2 times of this steel ingot height, highly obtain secondary biscuit.Described secondary biscuit pulls out the height that changes back to former steel ingot and obtains bar three times on forging press.
Step 4: three bars described in step 3 are heated to 1180 ℃ in process furnace, then on forging press described three bars again jumping-up to 1/2 times of this steel ingot height, highly obtain biscuit three times.Three times described biscuits pull out and change back to 3/2 of former steel ingot and highly obtain four bars (intermediate blank bar) on forging press.
Step 5: described four bars (intermediate blank bar) are heated to 1100 ℃ in process furnace, carry out just forging pulling to 9/5 times of height of intermediate blank bar, then in process furnace, be heated to 1050 ℃, finish-forging pulls out 18/5 times of intermediate blank bar and highly obtains thin crystal bar base.
The excellent base obtaining is sampled, sampling mode as shown in Figure 2, sample position: in L/4 length, the position sample of r/2 (10 * 10 * 15mm), metallographic face and axially parallel, and with excellent base tangentially parallel (radially vertical).
Obtained print is tested, and its interior tissue structure (amplifies 100 times) as shown in Figure 3 under microscope.
Result shows: the carbide of this rod base is even, and crystal grain is tiny, and grain fineness number reaches 6 grades of U.S. ASTM standards, for final production goes out the uniform large size alloy forged piece of fine grained texture, provides guarantee.
Embodiment 2
A kind of thin brilliant forging method step of large size GH690 nickel-base alloy rod base is as follows:
Step 1: by GH690 nickel-base alloy steel ingot in heat treatment furnace, be heated to 1180 ℃ and insulation 36 hours.
Step 2: the GH690 nickel-base alloy steel ingot after homogenizing is processed is heated to 1160 ℃ in process furnace then highly obtains biscuit described steel ingot jumping-up one time to 2/5 times of former steel ingot height on forging press.Again a described biscuit is pulled out and changes back to 9/10 times of former steel ingot and highly obtain secondary bar on forging press.
Step 3: described secondary bar is heated to 1160 ℃ in process furnace, then on forging press described secondary bar again jumping-up to 2/5 times of this steel ingot height, highly obtain secondary biscuit.Described secondary biscuit is pulled out and changes back to 9/10 times of former steel ingot and highly obtain bar three times on forging press.
Step 4: three times described bars are heated to 1160 ℃ in process furnace, then on forging press described three bars again jumping-up to 2/5 times of this steel ingot height, highly obtain biscuit three times.Three times described biscuits are pulled out and change back to 3/2 times of former steel ingot and highly obtain four bars (intermediate blank bar) on forging press.
Step 5: intermediate blank bar pulling.Four bars (intermediate blank bar) described in step 7 are heated to 1100 ℃ in process furnace, carry out just forging pulling to 9/5 times of height of intermediate blank bar, then in process furnace, be heated to 1050 ℃, finish-forging pulls out 18/5 times of intermediate blank bar and highly obtains thin crystal bar base.
The excellent base obtaining is sampled, sampling mode as shown in Figure 2, sample position: in L/4 length, the position sample of r/2 (10 * 10 * 15mm), metallographic face and axially parallel, and with excellent base tangentially parallel (radially vertical).
Obtained print is tested, and its interior tissue structure (amplifies 100 times) as shown in Figure 4 under microscope.
Result shows: the carbide of this rod base is even, and crystal grain is tiny, and grain fineness number reaches 6 grades of U.S. ASTM standards, for final production goes out the uniform large size alloy forged piece of fine grained texture, provides guarantee.
Claims (5)
1. a thin brilliant forging method for large size GH690 nickel-base alloy rod base, is characterized in that, the technical parameter of controlling in technique is as follows:
(1) large size GH690 nickel-base alloy steel ingot is carried out in heat treatment furnace to homogenizing processing to eliminate the segregation of Ti and C element; Large size GH690 nickel-base alloy steel ingot is of a size of Φ 550～600mm;
2) heat this steel ingot, jumping-up obtains biscuit one time, then this biscuit pulling is obtained to secondary bar;
3) heat described secondary bar, then jumping-up obtains secondary biscuit, then this biscuit pulling is obtained to bar three times;
4) heat described three bars, then jumping-up obtains biscuit three times, then this biscuit pulling is obtained to intermediate blank bar;
5) heat described intermediate blank bar, by first forging and finish-forging, obtain thin crystal bar base.
Every fire time deflection >=30%, maximum 50%.
2. forging method according to claim 1, it is characterized in that: step (2) realizes by following technique: GH690 nickel-base alloy steel ingot is heated to 1130 ℃～1180 ℃ in process furnace, then on forging press, described steel ingot jumping-up is highly obtained to biscuit one time to 1/3～1/2 times of former steel ingot height.Again this biscuit pulling is changed back to 4/5～1 times of former steel ingot height and highly obtain secondary bar.
3. forging method according to claim 1, it is characterized in that: step (3) realizes by following technique: the secondary bar described in step 2 is heated to 1130 ℃～1180 ℃ in process furnace, then on forging press described secondary bar again jumping-up to 1/3～1/2 times of this steel ingot height, highly obtain secondary biscuit; Again the pulling of described secondary biscuit is changed back to 4/5～1 times of former steel ingot height and highly obtain bar three times.
4. forging method according to claim 1, it is characterized in that: step (4) realizes by following technique: first three times described bars are heated to 1130 ℃～1180 ℃ in process furnace, then on forging press described three bars again jumping-up to 1/3～1/2 times of this steel ingot height, highly obtain biscuit three times; Again described three biscuits pulling is changed back to 3/2～5/3 times of former steel ingot and highly obtain bar four times.
5. forging method according to claim 1, it is characterized in that: step (5) realizes by following technique: first four times described bars are heated to 1050 ℃～1120 ℃ in process furnace, carry out just forging pulling to 3/2～2 times of height of four bar height, then in process furnace, be heated to 950 ℃～1080 ℃, finish-forging pulls out 7/2～4 times of four bar height and highly obtains thin crystal bar base.
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| CN103990751A (en) * | 2014-05-07 | 2014-08-20 | 钢铁研究总院 | 3D overall forging method for manufacturing high-alloying alloy-disc-shaped forging piece |
| CN104148562A (en) * | 2014-06-30 | 2014-11-19 | 贵州安大航空锻造有限责任公司 | Cogging method for Ti2AlNb-based alloy ingot |
| CN104741494A (en) * | 2015-04-02 | 2015-07-01 | 新奥科技发展有限公司 | Forging method of nickel base alloy containing copper and nickel base alloy containing copper |
| CN104988442A (en) * | 2015-07-10 | 2015-10-21 | 中南大学 | Thinning method of GH4169 alloy forging crystalline grain structure |
| CN105170865A (en) * | 2015-10-09 | 2015-12-23 | 大连理工大学 | Crystalline grain control method for GH690 alloy shear cover of explosion valve |
| CN105177478A (en) * | 2015-10-13 | 2015-12-23 | 北京科技大学 | Cogging method for large GH4738 high-temperature alloy ingot |
| CN105331912A (en) * | 2015-11-27 | 2016-02-17 | 西部超导材料科技股份有限公司 | GH4169 high-temperature alloy bar and manufacturing method thereof |
| CN105583251A (en) * | 2014-10-24 | 2016-05-18 | 中国科学院金属研究所 | Forging method for large-size Inconel690 alloy bar |
| CN105648373A (en) * | 2016-04-08 | 2016-06-08 | 中国第重型机械股份公司 | Forging grain control method for 617 nickel base alloy rotor forge piece for 700-DEG C ultra-supercritical unit |
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| CN109371344A (en) * | 2018-11-07 | 2019-02-22 | 成都先进金属材料产业技术研究院有限公司 | The forging technology of GH4169 alloy bar material |
| CN109500330A (en) * | 2017-09-14 | 2019-03-22 | 宝钢特钢有限公司 | A kind of cogging method of the big size ingot-casting of nickel-base alloy |
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| CN104148562B (en) * | 2014-06-30 | 2017-01-11 | 贵州安大航空锻造有限责任公司 | Cogging method for Ti2AlNb-based alloy ingot |
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| CN104741494A (en) * | 2015-04-02 | 2015-07-01 | 新奥科技发展有限公司 | Forging method of nickel base alloy containing copper and nickel base alloy containing copper |
| CN104988442A (en) * | 2015-07-10 | 2015-10-21 | 中南大学 | Thinning method of GH4169 alloy forging crystalline grain structure |
| CN104988442B (en) * | 2015-07-10 | 2017-03-08 | 中南大学 | A kind of thinning method of GH4169 alloy forged piece grain structure |
| CN105170865A (en) * | 2015-10-09 | 2015-12-23 | 大连理工大学 | Crystalline grain control method for GH690 alloy shear cover of explosion valve |
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| CN109500330A (en) * | 2017-09-14 | 2019-03-22 | 宝钢特钢有限公司 | A kind of cogging method of the big size ingot-casting of nickel-base alloy |
| CN108893689A (en) * | 2018-06-20 | 2018-11-27 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Inconel718 alloy disc forging homogenizes manufacturing method |
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| CN110747418A (en) * | 2019-12-05 | 2020-02-04 | 北京钢研高纳科技股份有限公司 | GH4738 alloy, homogenizing method thereof, turbine disc forging and gas turbine |
| CN111020298A (en) * | 2019-12-23 | 2020-04-17 | 西部超导材料科技股份有限公司 | GH3039 high-temperature alloy bar and preparation method thereof |
| CN111230015A (en) * | 2020-02-27 | 2020-06-05 | 无锡派克新材料科技股份有限公司 | High-temperature alloy grain refinement method |
| CN111604448A (en) * | 2020-06-05 | 2020-09-01 | 重庆钢铁研究所有限公司 | Forging method of high-temperature alloy GH4099 |
| CN113969380A (en) * | 2020-07-23 | 2022-01-25 | 宝武特种冶金有限公司 | Manufacturing method of nuclear-grade nickel-based alloy high-performance bar, bar and application |
| CN113969380B (en) * | 2020-07-23 | 2022-07-15 | 宝武特种冶金有限公司 | Manufacturing method of nuclear-grade nickel-based alloy high-performance bar, bar and application |
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