CN1233483C - Constant temperature toughness rolling method for GH4049 alloy - Google Patents
Constant temperature toughness rolling method for GH4049 alloy Download PDFInfo
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Abstract
The present invention relates to a constant temperature toughness rolling method for GH4049 alloy, which is used for hot processing of the high-temperature alloy which is difficult to deform. The present invention is characterized in that in the first step, when a rolling and cogging process is carried out, (1) firstly, a seamless stainless steel pipe whose size is matched with a casting ingot is coated on the casting ingot to reduce the temperature reducing speed of a rolling piece, and then, the rolling piece is heated according to a conventional technology; (2) the rolling piece is directly rolled and cogged into a square billet of 85mm by one heating process and multiple passes on a rolling mill; (3) after the square billet is cooled, the sleeve is removed, a head and a tail are cut, and the surface of the square billet is milled; (4) the square billet of 85mm is directly rolled into a square billet of 45mm by one heating process and multiple passes; in the second step, when a finished product material rolling process is carried out, (1) pure iron heads are welded with the head and the tail of the square billet of 45mm; (2) after the surface of the square billet of 45mm is cleaned and heated, the square billet of 45mm is directly rolled into a finished product bar of phi30 by one heating process and multiple passes. The present invention has the characteristics of reasonable hot processing technology, convenient production and organization and strong equipment universality, and effectively solves the technological problem of mass production of the hot rolling bars of the GH4049 alloy; in the finished products which are produced by the method of the present invention, the number of surface cracks is little, the alloy quality is high (the qualified rate of one time is 100%), and the production benefit is improved by more than 6 times.
Description
Technical field
The present invention relates to the hot-working production method of metallurgy industry high temperature alloy, refer in particular to the thermal processing molding method of difficult distortion GH4049 alloy.
Background technology
High temperature alloy is the necessary important meals material of modern aeroengine, rocket engine.It can and bear long-term use the under the big stress in high temperature (referring generally to 600～900 ℃), oxidizing atmosphere under the exhaust gas corrosion condition.The alloying level of high temperature alloy is all than higher, so also difficulty relatively of hot-working cogging, moulding.At present, the thermal processing molding method of high temperature alloy generally has two kinds: forging press forges, hot mill rolling.
As everybody knows: alloying element and content thereof can tentatively be determined the resistance of deformation of high temperature alloy and forge working plasticity.Generally speaking, the relatively low high temperature alloy resistance of deformation of alloying level is also low, and relatively easy deformation of good working plasticity is arranged; And the higher relatively high temperature alloy of alloying level, resistance of deformation is big, and hot-workability is just poor, is difficult for hammer cogging, is difficult for the high temperature alloy of hammer cogging, and General Definition is embarrassed wrought superalloy.
The GH4049 alloy is a variety name code name of high temperature alloy, is mainly used in the turbo blade of making aero-engine.Along with the renewal of development of aviation and turbo blade material, market is to the demand of GH4049 alloy hot rolled rod increasing (approximately needing 40～45 tons every year at present) in recent years.Turbo blade is the structural member of turbogenerator most critical, not only stressed big and complicated (centrifugal force, stamping press etc. are arranged), serviceability temperature height (being generally 700～900 ℃), condition of work is abominable, therefore requires very high to blade material: have enough heat resistances, good comprehensive performances, high as far as possible high-temperature oxidation resistance, good hot-working character.GH4049 alloy hot rolled rod is to require the most identical material with Blade Properties, it is the highest material of present moving turbine blade serviceability temperature, it is one of important materials of making moving turbine blade, also is many most difficult difficult wrought superalloy materials that carry out hot-working production of alloy material that are used for making blade.
The GH4049 high temperature alloy is a kind of Ni-Cr-Co based high-temperature alloy of complex alloysization, its alloying level is higher, 3.7～4.4% Al, 1.4～1.9% Ti are arranged in the alloy, both content sums greater than 6.0% (Al, Ti easily with alloy in Ni formation γ ` hardening constituent, in general, Al in the high temperature alloy, Ti content sum≤4%, Al, Ti content high strength more are high more, and resistance of deformation is big more.), and containing higher W, Mo, Co alloying elements (seeing Table 2) such as (strengthen crystal boundary, play the solution strengthening effect), the drag of alloy is very high.It strengthens matrix mutually with γ `, and strengthen crystal boundary with C, B, Ce, therefore, but GH4049 high temperature alloy resistance of deformation is very big, the very poor hot processing temperature narrow range of hot-workability (only having 80～90 ℃), it is a kind of difficult wrought superalloy of generally acknowledging, hot-working cogging, difficult forming can not be carried out hammer cogging, all adopt little ingot casting 1 directly to be rolled the hot-working cogging of becoming a useful person, the technology of moulding so participate in the domestic production manufacturer (as Fushun Steelworks) of development, trial-production.
Ingot casting is the rolling technology of becoming a useful person directly, be exactly with the little ingot casting of electroslag furnace remelting (the about 150～200kg of little ingot casting weight, ingot casting weight is too big, the alloying component segregation is serious, ingot casting weight is too little, influence is produced.) on milling train, directly carry out hot-working and become a useful person, its specification is generally φ 28～φ 34mm).Its shortcoming is: owing to the rolling time of the hot-working of GH4049 high temperature alloy is very short (on the one hand, but GH4049 alloy hot processing temperature scope is very narrow, and the ingot casting heating-up temperature is defined as 1180 ± 10 ℃, if heating-up temperature 〉=1180 ± 10 ℃, then alloy cast ingot burning causes and scraps; If finishing temperature 〉=1050 ℃ are finishing temperature＜1050 ℃, then alloy surface severe crack; And ingot casting is from coming out of the stove open rolling, and about 40～50 ℃ of temperature drop can hot worked temperature range only 80～90 ℃.On the other hand, ingot casting directly contacts with atmosphere on operation of rolling rolled piece surface, and temperature drop is very fast, causes that resistance of deformation descends with temperature and constantly increase, and distortion plasticity descends very fast.), resistance of deformation big (as Fig. 3, temperature in the time of 1120 ℃, its tensile strength sigma b be the about 100MPa of 10kg/mm2 ±, δ is 80%, its resistance of deformation is not very big, have higher hot-workability, when temperature was lower than 1120 ℃, hot strength σ b increased fast and plasticity declines to a great extent.), therefore the deflection of heating once and rolling is very little, only have 8～10%, for guaranteeing rolling temperature, rolled piece has to melt down heating again, carries out many fire time rolling (being generally 15～16 fire), the little ingot rolling of GH4049 high temperature alloy could be become the finished product bar of φ 28～φ 34, in addition, because many fiery rolling bar face cracks are also more serious, finished product bar stock removal is big.As seen this hot-working cogging, moulding process production efficiency and benefit are all very low, 12～13 hours every days, can only produce 5～6 stove ESR ingots, go out the material of 500～600kg, can't produce in batches, be the mode of production of a kind of " slow ox formula ", can not satisfy the demand of market far away the GH4049 alloy bar material.
Summary of the invention
The present invention develops the constant temperature toughness milling method of GH4049 alloy, and it is the improvement to traditional hot processing rolling mill practice, and when the hot-working rolling-cogging, employing gapless stainless steel tube jacket technology generation is for the operation of rolling under ingot casting is surperficial and atmosphere directly contacts; When alloy square billet 4 is become a useful person,, reduce the rolling intensity of nipping, guarantee that heating once and rolling becomes a useful person blank weld metal chieftain 5 end to end.Avoided ingot casting 1 in the rolling process of becoming a useful person of hot-working,, improved the production efficiency and the product quality of GH4049 high temperature alloy, satisfied market demand because of many fire time rolling technical barrier that rolling time is short, resistance of deformation causes greatly.
The constant temperature toughness milling method of GH4049 alloy provided by the invention, when it is characterized in that ingot casting 1 hot-working rolling-cogging, " constant temperature " technology of employing gapless stainless steel tube 2 jackets (in other words, the gapless stainless steel tube 2 of size coupling is wrapped on the little ingot casting 1 of alloy), alloy cast ingot 1 surface temperature in the hot-working operation of rolling is not changed substantially, slow down the temperature drop speed of rolled piece, realize the heating once and rolling cogging; Before rolling the becoming a useful person of alloy square billet 4 hot-working, blank weld metal chieftain 5 end to end, the intensity of nipping when reducing mill milling realizes that " toughness " of alloy square billet 4 is rolling, guarantees that the heating once and rolling of alloy square billet 4 is become a useful person:
The first step, hot-working rolling-cogging technology: (1) at first is wrapped in gapless stainless steel tube 2 on the little ingot casting 1 of alloy of electroslag furnace remelting, the little ingot casting 1 size coupling of stainless steel tube 2 internal diameter sizes and alloy; Put into the heating furnace heating then, heating-up temperature and temperature retention time, technological requirement routinely; (2) go out the little ingot casting 1 of alloy of the outer jacket gapless stainless steel tube 2 of heating furnace, on milling train, directly carry out the hot-working cogging, one fiery multi-pass rolling-cogging becomes 70 sides～100 sides' square billet 4 (because alloy cast ingot 1 usefulness stainless steel tube 2 has wrapped cover, in the operation of rolling, the rolled piece surface temperature is not easy to Atmospheric Diffusion, rolled piece is in a kind of steady temperature state to carry out, can increase the rolling pass of every fire and the deflection of every fire like this, rolled piece does not contact with atmosphere, the surface is difficult for cracking, substantially remain unchanged in whole operation of rolling steel ingot temperature, but prolonged the rolling working time of hot-working.); (3.1) 70 sides of outer jacket gapless stainless steel tube 2～100 sides' alloy square billet 4 goes cover, crop end, figuring of surface after the cooling; (3.2) 70 sides～100 sides' square billet 4 once more routinely heating process require into the heating furnace heating, 70 sides after the heating～100 sides' square billet 4 directly carries out hot-working on milling train, a fiery multi-pass is rolling to 40 sides～50 sides' square billet 4;
Second step, the rolling technology of becoming a useful person of hot-working: (1) alloy square billet 4, weld metal chieftain 5 (the alloying level height of GH4049 alloy end to end, resistance of deformation increases with the reduction of temperature, the head of alloy square billet 4 in the operation of rolling, tail end temperature drop are faster, resistance of deformation increases, and it is quite difficult to cause milling train to nip, and just must melt down heating again in case can't nip; After being welded on square billet 4 metal chieftain 5 end to end, utilize metal chieftain 5 the toughness effect of nipping, guarantee that heating once and rolling becomes a useful person, avoid many fire rolling, significantly reduce the generation of face crack.); (2) square billet 4 after the surface grinding cleaning, heating process requires into heating furnace heating routinely; (3) the alloy square billet 4 after will heating directly carries out hot-working and becomes a useful person on milling train, and a fiery multi-pass is rolling to the finished product bar: 40 sides～50 sides' square billet 4 is rolling to the finished product bar of φ 20～φ 40; 70 sides～100 sides' square billet 4 is rolling to the finished product bar of φ 40～φ 60.
Before the hot-working rolling-cogging, during alloy cast ingot 1 usefulness gapless stainless steel tube 2 jackets, at ingot casting 1 two ends welding pure iron 3, pure iron 3 sizes and alloy cast ingot 1, gapless stainless steel tube 2 internal diameters coupling.
During the hot-working rolling-cogging, directly carry out gapless stainless steel tube 2 jackets of hot-working cogging on milling train, (thickness＜5mm is prone to cover and breaks thickness 5～10mm; Thickness＞10mm, the rolling deformation of alloy cast ingot 1 is not saturating, and waste stainless steel tube material.)。
The material of gapless stainless steel tube 2 is the stainless steels except that martensitic stain less steel, and preferably 1Cr18Ni9Ti mainly is the characteristics that oxidation resistance is strong, intensity is low, hot-workability is good when utilizing stainless hot processing temperature wide ranges, high temperature.
During the hot-working roll forming, be welded on 40 sides～50 sides' alloy hot-working base metal chieftain 5 end to end, high temperature alloy that material is pure iron, stainless steel, alloying level is lower etc., stainless steel preferably, mainly be the hot processing temperature wide ranges of utilizing these materials, the characteristics that oxidation resistance is strong during high temperature, intensity is low, hot-workability is good.
Compare with prior art, the present invention has following advantage:
1. hot-working cogging moulding process is workable;
2. equipment highly versatile;
3. the alloy surface crackle is few, and the workload of abrasive cleaning also reduces;
4. a fiery multi-pass is rolling, production efficiency, alloy mass height;
5. difficult wrought superalloy hot rolled rod can be mass-produced.
Description of drawings
Fig. 1 is the schematic diagram of stainless steel tube jacket alloy cast ingot under the hot-working rolling-cogging technology
Fig. 2 is weld metal chieftain's an alloy square billet schematic diagram end to end under the rolling technology of becoming a useful person of hot-working
Fig. 3 is GH4049 alloy hot-workability figure
Specific embodiments
Certain iron company implements patent of the present invention, the electroslag furnace remelting ingot casting 1 (ingot casting 1 size: φ 165/ φ 185) of the GH4049 of stove more than 150 high temperature alloy is directly carried out hot-working cogging, moulding on hot-rolling mill, produce GH4049 alloy hot rolled rod (trimmed size: φ 18～φ 60).Below with φ 22, φ 28, the GH4049 alloy hot rolled rod production of φ 32 and φ 36mm is example: raw material preparation → vacuum induction furnace smelting cast φ 125 * 1800mm electrode → electrode surface abrasive cleaning → electroslag furnace refusion and smelting, ingot casting 1 size φ 165/ φ 185 → ESR ingot homogenising processing → ESR ingot ESR ingot of 1Cr18Ni9Ti gapless stainless steel tube 2 jackets → outer jacket gapless stainless steel tube 2 of thickness 5～10mm, technological requirement is advanced the heating furnace heating routinely, 1180 ± 10 ℃ of heating-up temperatures, temperature retention time 〉=2～3 hour, → on 550 milling trains, directly carry out the hot-working cogging, one fiery 9 passage hot rolling coggings to 85mm square billet 4 → 85mm square billet 4 removes cover, crop end, figuring of surface → on 550 milling trains, directly carry out hot-working, with 85mm square billet 4 one fiery 7 passages be rolling to that 45mm square billet 4 → 45mm square billet 4 surface grindings cleanings blank segmentation → 45mm square billet 4 welds the pure iron material end to end metal chieftain 5 → weld metal chieftain 5 45 square billets 4 advance the heating furnace heating end to end, 1180 ± 10 ℃ of heating-up temperatures, 45mm square billet 4 after temperature retention time 〉=2.0 hour → heating, on 300 milling trains, directly carry out hot-working, with the finished product bar → bar aligning of 45mm square billet 4 one fiery 9 passage roll formings to φ 30mm, polishing, flaw detection → performance test → delivery.The present invention has the advantages that heat processing technique is reasonable, organization of production convenient, the scene is workable, equip highly versatile, efficiently solve the technical barrier that GH4049 alloy hot rolled rod is produced in enormous quantities, (pay the bar of stove more than 150 of aviation 410 factories and 420 factories, every performance indications first-time qualification rate of user's incoming test is 100% for the GH4049 alloy hot rolled rod face crack of producing few (workload of abrasive cleaning also reduces), alloy mass height.), production efficiency reaches 40～45 stove/skies, improves productivity effect and (sees Table 1) more than 6 times, economic benefit and obvious social benefit.
Hot-working production efficiency comparison sheet table 1
| Rolling specs mm | Rolling fire | Output every day (unidimensional) | |
| Before the enforcement | Ф28 | 15 ~ 16 fire | 5 ~ 6 stoves |
| After the enforcement | Ф28 | 3 | 40 ~ 45 stoves |
GH4049 alloy composition, % table 2
| Element | C | Cr | Co | W | Mo | Al | Ti | Fe | V | B | ||||
| Technical conditions GB/T149 93-94 | 0.04 ～ 0.10 | 9.5 ～ 11.0 | 14.0 ～ 16.0 | 5.0 ～ 6.0 | 4.50 ～ 5.50 | 3.70 ～ 4.40 | 1.40 ～ 1.90 | ≤ 1.5 | 0.20 ～ 0.50 | 0.015 ～ 0.025 | ||||
| Element | Ce | Ni | Mn | Si | P | S | Cu | |||||||
| Technical conditions GB/T1499 3-94 | ≤0.020 | Surplus | ≤0.50 | ≤0.50 | ≤0.010 | ≤0.010 | ≤ 0.07 | |||||||
Claims (6)
1, the constant temperature toughness milling method of GH4049 alloy when it is characterized in that ingot casting (1) hot-working rolling-cogging, adopts " constant temperature " technology of gapless stainless steel tube (2) jacket, realizes a fiery split rolling method; Before rolling the becoming a useful person of alloy square billet (4) hot-working,, realize rolling the becoming a useful person of a fire " toughness " of alloy square billet (4) the chieftain of weld metal end to end (5) of alloy square billet (4):
The first step, hot-working rolling-cogging technology: (a) at first gapless stainless steel tube (2) is wrapped on the little ingot casting of alloy (1) of electroslag furnace remelting stainless steel tube (2) internal diameter size and the little ingot casting of alloy (1) size coupling; Put into the heating furnace heating then, heating-up temperature and temperature retention time, technological requirement routinely; (b) go out the little ingot casting of alloy (1) of the outer jacket gapless stainless steel tube (2) of heating furnace, directly carry out the hot-working cogging on milling train, a fiery multi-pass rolling-cogging becomes 70 sides～100 sides' square billet (4); (c1) 70 sides of outer jacket gapless stainless steel tube (2)～100 sides' alloy square billet (4) goes cover, crop end, figuring of surface after the cooling; (c2) 70 sides～100 sides' square billet (4) once more routinely heating process require into the heating furnace heating, 70 sides after the heating～100 sides' square billet (4) directly carries out hot-working on milling train, a fiery multi-pass is rolling to 40 sides～50 sides' square billet (4);
Second step, the rolling technology of becoming a useful person of hot-working: (a) alloy square billet (4) weld metal chieftain (5) end to end; (b) square billet (4) after the surface grinding cleaning, heating process requires into heating furnace heating routinely; (c) the alloy square billet (4) after will heating directly carries out hot-working and becomes a useful person on milling train, and a fiery multi-pass is rolling to the finished product bar: 40 sides～50 sides' square billet (4) is rolling to the finished product bar of φ 20～φ 40; 70 sides～100 sides' square billet (4) is rolling to the finished product bar of φ 40～φ 60.
2, the constant temperature toughness milling method of GH4049 alloy according to claim 1, it is characterized in that: before the hot-working rolling-cogging, when alloy cast ingot (1) is used gapless stainless steel tube (2) jacket, at ingot casting (1) two ends welding pure iron (3), pure iron (3) size and gapless stainless steel tube (2) internal diameter, alloy cast ingot (1) coupling.
3, the constant temperature toughness milling method of GH4049 alloy according to claim 1 and 2 is characterized in that: during the hot-working rolling-cogging, directly carry out gapless stainless steel tube (2) jacket of hot-working cogging on milling train, thickness 5～10mm.
4, the constant temperature toughness milling method of GH4049 alloy according to claim 1 and 2 is characterized in that: the material of gapless stainless steel tube (2) is the stainless steel except that martensitic stain less steel.
5, the constant temperature toughness milling method of GH4049 alloy according to claim 1 and 2, it is characterized in that: during the hot-working roll forming, be welded on alloy square billet (4) metal chieftain (5) end to end, the high temperature alloy that material can be pure iron, stainless steel, alloying level is lower.
6, according to the constant temperature toughness milling method of claim 1 or 2 or 4 described GH4049 alloys, it is characterized in that: the material of gapless stainless steel tube (2) can be the 1Cr18Ni9Ti stainless steel.
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| CN 200310109193 CN1233483C (en) | 2003-12-09 | 2003-12-09 | Constant temperature toughness rolling method for GH4049 alloy |
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| CN 200310109193 CN1233483C (en) | 2003-12-09 | 2003-12-09 | Constant temperature toughness rolling method for GH4049 alloy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101829889A (en) * | 2010-04-30 | 2010-09-15 | 钟长林 | Production process of austenitic stainless steel bar by short-process continuous casting and rolling |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109158960A (en) * | 2018-09-30 | 2019-01-08 | 江苏省沙钢钢铁研究院有限公司 | Grinding method for improving surface quality of large-size spring steel billet |
| CN111519069B (en) * | 2020-05-08 | 2021-11-30 | 中国华能集团有限公司 | High-strength nickel-cobalt-based high-temperature alloy and preparation process thereof |
| CN111411266B (en) * | 2020-05-08 | 2021-03-16 | 中国华能集团有限公司 | Preparation process of nickel-based high-tungsten polycrystalline superalloy |
| CN113118354B (en) * | 2021-04-19 | 2023-03-17 | 中航上大高温合金材料股份有限公司 | Forging method of GH4049 alloy bar |
| CN113913648B (en) * | 2021-10-28 | 2022-08-02 | 西安超晶科技有限公司 | Preparation method of wide alloy plate |
| CN114540668B (en) * | 2022-01-21 | 2022-10-25 | 中航上大高温合金材料股份有限公司 | Smelting process for producing high-temperature alloy GH4049 difficult to deform from high-purity return material |
| CN114472514A (en) * | 2022-02-08 | 2022-05-13 | 西安聚能高温合金材料科技有限公司 | Method for rolling homogeneous fine-grained bar of high-temperature alloy GH4720Li difficult to deform |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101829889A (en) * | 2010-04-30 | 2010-09-15 | 钟长林 | Production process of austenitic stainless steel bar by short-process continuous casting and rolling |
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