CN109023221B - The heat treatment method of aero-engine blade mounting base - Google Patents

The heat treatment method of aero-engine blade mounting base Download PDF

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Publication number
CN109023221B
CN109023221B CN201810924700.8A CN201810924700A CN109023221B CN 109023221 B CN109023221 B CN 109023221B CN 201810924700 A CN201810924700 A CN 201810924700A CN 109023221 B CN109023221 B CN 109023221B
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Prior art keywords
temperature
workpiece
mounting base
blade mounting
carburizing
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CN201810924700.8A
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CN109023221A (en
Inventor
利淑琴
吉宜勇
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Changzhou Hangfa China Lanxiang Machinery LLC
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Changzhou Hangfa China Lanxiang Machinery LLC
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/04—Treatment of selected surface areas, e.g. using masks
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/22—Martempering
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The present invention relates to a kind of aero-engine heat treatment methods of blade mounting base, including to the copper plate for needing carburized zone surface after blade mounting base workpiece surface all progress copper plating treatment using machining removal, then Carburization Treatment is carried out, can achieve and only carry out the purpose of carburizing in regional area.It is protected when carrying out Quench heating using solid carburizer; carburizing layer surface is avoided oxidation and decarbonization occur; after quenching treatment; original salt bath heat-treatment furnace is replaced using moveable thermostatic oil bath; the convergence time between process can be reduced; contact when reducing workpiece high temperature with air, avoids carburizing layer surface from decarburization occur；It can avoid workpiece workpiece surface spot temperature in quenching transfer process simultaneously and be down to Ms point (180 DEG C) below；Temperer vanning of the workpiece merging equipped with protection medium after isothermal hardening, can be kept the temperature, avoid workpiece surface spot temperature from dropping to Ms point (180 DEG C) hereinafter, can accelerate heat transfer in subsequent tempering simultaneously, reduce energy loss.

Description

The heat treatment method of aero-engine blade mounting base
Technical field
The present invention relates to 18Cr2Ni4WA heat treatment of workpieces technical fields, and particularly a kind of aero-engine is pacified with blade Fill the heat treatment method of seat.
Background technique
18Cr2Ni4WA has good processability and anti-fatigue performance, and has ideal harden ability, obdurability With preferable carburizing controllability, it is to produce the irreplaceable material of heavy load driving member, there is extensive use in aircraft industry It on the way, is the method for conventional raising workpiece surface hardness to the progress carburizing of its surface, Nitrizing Treatment when manufacture.
Blade mounting base surface hardness used in aero-engine has particular/special requirement, since it uses characteristic requirements office Portion's carburizing, as shown in Figure 1, a kind of blade mounting base, material 18Cr2Ni4WA, it is desirable that the region Q, R, H, G carries out carburizing in figure Processing, surface hardness are not less than 58HRC, and for non-carburized zone, hardness requirement is not less than 33-37HRC, complete Carburization Treatment In quenching process afterwards, it is easy to appear surface oxidation decarburization, the problem of infiltration layer forms tempered sorbite, blade mounting base carburizing face Surface hardness be unable to satisfy requirement.
Specified region is carried out carburizing how to protect carburized layer not decarburization after the completion and do not form tempered sorbite being ability Field technique personnel are badly in need of technical problems to be solved.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of easily operated, effective realization regional area anti-carburizi ng, protect Shield carburized layer not decarburization and the blade mounting base heat treatment method for not forming tempered sorbite.
A kind of blade mounting base heat treatment method, comprising:
A. blade mounting base workpiece surface is all subjected to copper plating treatment.
B. the region for requiring carburizing is machined out, removes the copper plate on carburized zone surface, realize that regional area seeps Carbon.
C. be placed in the multipurpose furnace of sealing through treated workpiece, be passed through gas carburzier, be heated to 890 DEG C~ 910 DEG C, 10~14 hours are kept the temperature, it is air-cooled after coming out of the stove, Carburization Treatment is carried out to blade mounting base, surface does not have the region of copper plate Obtain carburizing.
D. workpiece is taken out after the completion of carburizing, is tempered, 640 DEG C~660 DEG C of temperature, kept the temperature 5~6 hours, be furnace-cooled to It comes out of the stove after 350 DEG C or less air-cooled.
E. blade mounting base workpiece is quenched, temperature is 830 DEG C~850 DEG C, keeps the temperature 105~135 minutes, In Solid carburizer vanning embedding is used to be protected during this；Workpiece merging thermostatic oil bath isothermal is carried out rapidly after coming out of the stove to quench Fire, the carburizing face temperature of avoiding are down to Ms point or less (180 DEG C), form quenched martensite, while workpiece being avoided to contact with air It is more, workpiece carbonization emaciated face carbon is caused, 220 DEG C~240 DEG C of temperature, the time 8~15 minutes, blade mounting base is placed in fills after the completion There is the Temperer vanning of protection medium.
F. Temperer vanning is transferred to chamber type annealing stove and first time tempering is carried out to blade mounting base workpiece, temperature is 510 DEG C~570 DEG C, keep the temperature 1.5~2 hours, then carry out it is ice-cold, -75 DEG C~-85 DEG C of temperature, keep the temperature 2~3 hours.
G. second of tempering is carried out to blade mounting base workpiece, temperature is 150 DEG C~170 DEG C, heat preservation 2.5~3.5 Hour.
H. workpiece carbonization face and non-carburizing surface hardness are detected, removes the non-cemented zone of blade mounting base after detection is qualified The copper plate in domain.
Further, the gas carburzier in step C is the mixed gas of acetone, methanol and nitrogen, can effectively control infiltration Carbonaceous amount, high production efficiency.
Further, the protection medium in step E is sand, can be kept the temperature, avoid workpiece surface in transfer process Temperature is down to surface portion Ms point (180 DEG C) hereinafter, the carburizing face of avoiding surface forms quenched martensite, while in subsequent tempering In can accelerate heat transfer, reduce energy loss.
Carburized zone surface is needed using machining removal to after blade mounting base workpiece surface all progress copper plating treatment Then copper plate carries out Carburization Treatment, can achieve and only carry out the purpose of carburizing in regional area.It is adopted when carrying out Quench heating It is protected with solid carburizer, carburizing layer surface is avoided oxidation and decarbonization occur, after quenching treatment, use moveable thermostatical oil Slot replaces original salt bath heat-treatment furnace, it is possible to reduce the convergence time between process, contact when reducing workpiece high temperature with air, Carburizing layer surface is avoided decarburization occur；It can avoid workpiece workpiece surface spot temperature in quenching transfer process simultaneously and be down to Ms point (180 DEG C) are hereinafter, the carburizing face of avoiding surface forms quenched martensite, to form tempered sorbite in subsequent drawing process； Workpiece merging after isothermal hardening is cased equipped with the Temperer of sand, can be kept the temperature, workpiece surface spot temperature is avoided to drop To Ms point (180 DEG C) hereinafter, heat transfer can be accelerated in subsequent tempering simultaneously, energy loss is reduced.By the above method, It can effectively realize carburized layer not decarburization after the completion of specifying region to carry out carburizing, carburizing blade mounting base and not form tempering rope Family name's body is easy to produce in batches, low in cost.
Detailed description of the invention
Invention is further described in detail with reference to the accompanying drawings of the specification:
Fig. 1 is the schematic diagram that blade mounting base requires carburizing face.
Specific embodiment
Embodiment 1
The blade mounting base heat treatment method of the present embodiment, treated that blade mounting base is machined to quenched, Remove surface scale；Copper plating treatment is carried out to blade mounting base workpiece surface, it is ensured that workpiece surface all covering copper facing protections Film；Blade mounting base is machined out, the plating Cu protective film of removal Q, R, H, G region surface attachment is convenient for subsequent carburizing.
Blade mounting base workpiece is placed in the multipurpose furnace of sealing, acetone and each accounting 50%(volume ratio of ethyl alcohol are passed through) Gas carburzier, keeps the temperature 12 hours by 900 DEG C ± 10 DEG C of temperature, air-cooled after coming out of the stove, and carries out Carburization Treatment to blade mounting base, obtains To workpiece need carburized zone surface carburized (case) depth be 1.25~1.35mm；High temperature is carried out to blade mounting base workpiece to return Fire, keeps the temperature 5 hours, comes out of the stove air-cooled after being furnace-cooled to 350 DEG C, can eliminate inside workpiece transformation hardening by 650 DEG C ± 10 DEG C of temperature. Blade mounting base workpiece is quenched, temperature is 840 ± 10 DEG C, keeps the temperature 75 minutes, is seeped in the process using solid Carbon agent embedding vanning is protected；Workpiece merging thermostatic oil bath is subjected to isothermal hardening rapidly after coming out of the stove, avoids workpiece and air Contact is excessive, causes workpiece carbonization emaciated face carbon, while workpiece workpiece surface spot temperature in quenching transfer process being avoided to be down to Ms point (180 DEG C) is hereinafter, make surface form quenched martensite, to avoid forming tempering Soxhlet in subsequent drawing process Body, keeps the temperature 12 minutes by 230 ± 10 DEG C of temperature, and the merging of blade mounting base is cased equipped with the Temperer of sand immediately after the completion.It can To be kept the temperature, workpiece surface spot temperature is avoided to drop to Ms point (180 DEG C) hereinafter, can accelerate in subsequent tempering simultaneously Heat transfer reduces energy loss；Temperer vanning is transferred to chamber type annealing stove, first time tempering is carried out to blade mounting base workpiece Processing, temperature be 540 ± 30 DEG C, keep the temperature 2 hours, then carry out it is ice-cold, -75 DEG C~-85 DEG C of temperature, keep the temperature 3 hours.To blade Mounting base workpiece carries out second of tempering, and temperature is 160 ± 10 DEG C, keeps the temperature 3 hours, detects to obtained workpiece, The hardness of carburized zone reaches 60HRC, and the hardness of non-carburized zone is 35HRC, can satisfy the demand used.
By all carrying out copper facing to blade mounting base workpiece surface before carburizing, solid is used when carrying out Quench heating Carburizer is protected, and carburizing layer surface is avoided oxidation and decarbonization occur, after quenching treatment, is replaced using moveable thermostatic oil bath Salt bath heat-treatment furnace originally, it is possible to reduce the convergence time between process, contact when reducing workpiece high temperature with air avoid seeping There is decarburization in carbon-coating surface；It can avoid workpiece workpiece surface spot temperature in quenching transfer process simultaneously and be down to Ms point (180 DEG C) hereinafter, making surface form quenched martensite, to form tempered sorbite in subsequent drawing process；After isothermal hardening Workpiece merging equipped with protection medium Temperer vanning, can be kept the temperature, workpiece surface spot temperature is avoided to drop to Ms point (180 DEG C) reduce energy loss hereinafter, can accelerate heat transfer in subsequent tempering simultaneously.
Obviously, the above embodiment is merely an example for clearly illustrating the present invention, and is not to of the invention The restriction of embodiment.For those of ordinary skill in the art, it can also be made on the basis of the above description Its various forms of variation or variation.There is no necessity and possibility to exhaust all the enbodiments.And these belong to this hair The obvious changes or variations that bright spirit is extended out are still in protection scope of the present invention.

Claims (2)

1. a kind of blade mounting base heat treatment method characterized by comprising
A. treated that blade mounting base is machined to quenched, removes surface scale；By blade mounting base workpiece table Face all carries out copper plating treatment；
B. the region for requiring carburizing is machined out, removes the copper plate on carburized zone surface；
C. it is placed in the multipurpose furnace of sealing through treated workpiece, is passed through what volume ratio was constituted for the acetone and ethyl alcohol of 1:1 Gas carburzier is heated to 900 DEG C ± 10 DEG C, keeps the temperature 12 hours, air-cooled after coming out of the stove, and carries out Carburization Treatment to blade mounting base, Surface does not have the region of copper plate to obtain carburizing；
D. workpiece is taken out after the completion of carburizing, is tempered, 650 DEG C ± 10 DEG C of temperature, keep the temperature 5 hours, gone out after being furnace-cooled to 350 DEG C Furnace is air-cooled；
E. blade mounting base workpiece is quenched, temperature is 840 ± 10 DEG C, 75 minutes is kept the temperature, in the process to work Part is protected using solid carburizer vanning embedding；Workpiece merging thermostatic oil bath is subjected to isothermal hardening rapidly after coming out of the stove, is kept away Exempt from workpiece surface spot temperature and drop to 180 DEG C hereinafter, 230 ± 10 DEG C of temperature, the time 12 minutes, blade is installed into seating after the completion Enter the Temperer vanning equipped with protection medium, while being kept the temperature；
F. Temperer vanning is transferred to chamber type annealing stove and first time tempering, temperature 540 is carried out to blade mounting base workpiece ± 30 DEG C, keep the temperature 2 hours, then carry out it is ice-cold, -75 DEG C~-85 DEG C of temperature, keep the temperature 3 hours；
G. second of tempering is carried out to blade mounting base workpiece, temperature is 160 ± 10 DEG C, keeps the temperature 3 hours；
H. workpiece carbonization face and non-carburizing surface hardness are detected, removes the non-carburized zone of blade mounting base after detection is qualified Copper plate.
2. blade mounting base heat treatment method according to claim 1, which is characterized in that the protection in the step E is situated between Matter is sand.
CN201810924700.8A 2015-09-29 2015-09-29 The heat treatment method of aero-engine blade mounting base Active CN109023221B (en)

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CN201510631204.XA Active CN106555153B (en) 2015-09-29 2015-09-29 A kind of blade mounting base heat treatment method
CN201810925322.5A Active CN108950466B (en) 2015-09-29 2015-09-29 The aero-engine blade mounting base of tempered sorbite is not will form
CN201810924698.4A Active CN108913850B (en) 2015-09-29 2015-09-29 It is easy to the aero-engine blade mounting base produced in batches

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CN201810924698.4A Active CN108913850B (en) 2015-09-29 2015-09-29 It is easy to the aero-engine blade mounting base produced in batches

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CN107904549B (en) * 2017-10-16 2019-12-24 武汉钢铁有限公司 Processing method and application of 1300 MPa-grade gradient performance hot forming part
CN108570640A (en) * 2018-05-29 2018-09-25 沈阳飞机工业（集团）有限公司 A kind of pin local carburzing method
CN109371205A (en) * 2018-12-26 2019-02-22 溧阳福思宝高速机械有限公司 A kind of three-dimensional flow impeller quenching processing technology
CN111218639A (en) * 2019-06-25 2020-06-02 贵州航天精工制造有限公司 Technological method for improving mechanical property of certain type nut
CN110484857A (en) * 2019-09-28 2019-11-22 贵州航天精工制造有限公司 A kind of process improving eccentric bush performance

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1110332A (en) * 1995-03-20 1995-10-18 长春市华光热处理技术研究所 Postheating treatment process after metallic cementation
JP2003277976A (en) * 2002-03-26 2003-10-02 Osaka Gas Co Ltd Heat resistant member and method for manufacturing the same
CN100570006C (en) * 2008-04-30 2009-12-16 上海热处理厂有限公司 The 20CrMnMo energy-saving carburizing composite heat treating process
CN101424296B (en) * 2008-12-05 2012-02-08 浙江长宏机电有限公司 Method for processing crank connecting rod
CN101581200A (en) * 2009-05-31 2009-11-18 盘锦辽河油田派普钻具制造有限公司 120 steel grade drill pipe and manufacturing process method thereof
CN102888610A (en) * 2012-10-24 2013-01-23 哈尔滨东安发动机（集团）有限公司 Thermal treatment method for internal spline gear with small modulus
CN104372157B (en) * 2014-11-14 2018-11-20 哈尔滨东安发动机（集团）有限公司 Duplex spiral bevel gear method for controlling heat treatment deformation
CN105755265A (en) * 2014-12-13 2016-07-13 重庆环德科技有限公司 Dividing head worm heat treatment process

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CN108950466B (en) 2019-10-29
CN108950466A (en) 2018-12-07
CN106555153A (en) 2017-04-05
CN108913850B (en) 2019-11-08
CN108913850A (en) 2018-11-30
CN106555153B (en) 2018-09-21

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