CN104043833B - Method for adopting powder metallurgy hot isostatic pressing near-net-shape forming technology for preparing motor protecting ring - Google Patents
Method for adopting powder metallurgy hot isostatic pressing near-net-shape forming technology for preparing motor protecting ring Download PDFInfo
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- CN104043833B CN104043833B CN201410308698.3A CN201410308698A CN104043833B CN 104043833 B CN104043833 B CN 104043833B CN 201410308698 A CN201410308698 A CN 201410308698A CN 104043833 B CN104043833 B CN 104043833B
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Abstract
The invention provides a method for adopting a powder metallurgy hot isostatic pressing near-net-shape forming technology for preparing a motor protecting ring. The protecting ring is made of a protecting ring steel material with the nitrogen content of 0.4-1.0%, the process of combining a pressurizing induction melting of mother alloy and nitrogen atomization is adopted for preparing powder with the average granularity of 5 micrometers-100 micrometers, the powder is placed into a cylindrical or a circular-ring-shaped bag sleeve, then vacuumizing and seal welding are carried out, then the powder is placed in a hot isostatic pressing furnace for pressurization and heat preservation, compacting is carried out on the powder to obtain a protecting ring blank, the bag sleeve is turned off through a machining method, cold swelling formation and annealing stress relief are carried out on the blank, the processing temperature ranges from 330 DEG C to 350 DEG C, the speed of temperature rising is smaller than 40 DEG C per hour, the speed of temperature falling is smaller than 30 DEG C per hour, and time for heat preservation ranges from 10 minutes-12 minutes. According to the method, the texture performance is uniform, the crystal particles are small, the overall performance of products is high, the use reliability of the protecting ring and a whole machine can be improved greatly, surface cracks of the protecting ring in the manufacturing process can be effectively avoided, the protecting ring is treated in the mode of being free from solid solutions, and the rate of finished products is effectively increased.
Description
Technical field
The invention belongs to metal material field, it is related to a kind of electric using the preparation of powder metallurgy high temperature insostatic pressing (HIP) Near net Shaping Technology
The method of machine retaining ring.
Background technology
Retaining ring is the heavy forging steel loop at generator amature two ends for the compression fit, is large-scale crucial the zero of thermoelectricity generating equipment
One of part.Retaining ring stress in high-speed rotation is complicated, not only will bear huge centrifugal force, still suffer from dress during hot charging simultaneously
Join stress, the uneven load additional stress causing, the alternate stress being transmitted by rotor and due to the concentration causing being required on structure
Stress.Therefore, the long-term safety for ensureing unit is run it is desirable to retaining ring has enough intensity, good toughness, uniform mechanics
Performance and minimum residual stress.Retaining ring works in high-intensity magnetic field, moist corrosive medium, and therefore retaining ring generally adopts austenite
Nonmagnetic steel manufactures.Additionally due to the particularity of working environment is it is desirable to shelling ring material possesses certain stress corrosion resistant ability.Therefore
Having good metallurgical quality, chemical composition, organizational structure, grain size and the crystal grain uniformity will be reasonable be required to shelling ring material.
In existing material, P900 (18Cr-18Mn-0.6N), P900-N (18Cr-18Mn-0.9N) and P2000 (16Cr-14Mn-
3Mo-0.9N), P900NMo (18Cr-18Mn-2Mo-0.9N) different materials have good fracture toughness, in atmosphere various
Splitting resistance in environment is also fine, is the widely used steel grade of current more than 300MW high-rating generator retaining ring.
The preparation of retaining ring at present is that many fire time heat, multiple operation deformation shapes, and this process is typically passed through ingot smelting, electricity
Multiple forging work steps such as slag remelting and pulling, blanking, upset, free piercing, core bar drawing, plug reaming, generally heat fire
Secondary is more than 8 times.Because this technique process is long, lead to long the production cycle, process costs higher, forming process controllability simultaneously
Poor, forging face crack is serious, coarse grains and uneven, and heat forging technology is seriously not suitable with current demand for development.Additionally,
Increasingly cause the attention of power station heavy forging manufacturing firm in manufacture process the problems such as the coarse-grain of appearance, mixed crystal, become control
One of product quality, important step of raising technological level.Therefore, how carefully to homogenize above-mentioned several Retaining Ring Steel austenite structure
It is the key issue that current retaining ring produces.
Content of the invention
The invention aims to solving the complex process of many fire forging technologies presence, retaining ring surface easily goes out crackle, inside
The uneven technical problem of structure property.
A kind of method preparing motor retaining ring using powder metallurgy high temperature insostatic pressing (HIP) Near net Shaping Technology, that is, adopt powder metallurgy
Heat and other static pressuring processes are prepared, and have technique：First according to existing several alloys such as P900 (18Cr-18Mn-0.6N), P900-N
(18Cr-18Mn-0.9N) with P2000 (16Cr-14Mn-3Mo-0.9N), the composition of P900NMo (18Cr-18Mn-2Mo-0.9N)
Require, requirement is met using pressurized Induction Melting and nitrogen atomization technique prepared composition, particle mean size is 5～100 μm of powder
Powder, then according to final products size and sintering shrinkage rule design jacket, a size of final products cold expanding change of usual jacket
15-20% is amplified on size basis before shape, jacket shape determines according to final products shape, usually cylindrical or annular,
Powder is loaded in cylindrical or annular jacket and carries out evacuation solder up, be then placed in high temperature insostatic pressing (HIP) stove in
1150-1300 DEG C, pressure 70～120MPa, insulation 60-120min carries out densification and obtains retaining ring blank, then jacket is adopted
After being fallen with machining method car, blank is carried out with cold expanding shaping and annealing destressing is processed, treatment temperature is 330-350 DEG C, heats up
Speed is less than 40 DEG C/h, and rate of temperature fall is less than 30 DEG C/h, and temperature retention time is 10-12 hour, finally according to product size and coarse
Degree requirement carries out polish.
The prepared retaining ring under above-mentioned process conditions of the present invention, due to adopting powder metallurgical technique, the sense of organization of retaining ring
Can evenly, crystal grain is more tiny, therefore every mechanical performance index of retaining ring apparently higher than traditional forging and forming technology, such as
P900 strength of alloy (95～105 DEG C, before cold expanding deformation) reaches 1290～1300MPa, and undulating value is less than 15MPa, surrender
Intensity reaches 1280～1295MPa, and undulating value is less than 15MPa, and elongation percentage is more than 20%, and the contraction percentage of area is more than 60%, impact
Work(is more than 130J, even grain size, and average grain size is 40-45 μm, and combination property is reached far above common process
Performance level.In addition this technique process is simple, can be prevented effectively from the face crack of retaining ring in forging process, retaining ring is exempted from solid solution
Reason, effectively improves yield rate, and reduces manufacturing cost.
Brief description：
Fig. 1 is the process chart of the present invention：
Specific embodiment：
(1) prepare a size of Φ 600mm (external diameter) × 50mm (wall thickness) × 400mm (high) P900 (18Cr-18Mn-0.6N)
Retaining ring (note：A size of size before cold expanding deformation)
It is first according to P900 (18Cr-18Mn-0.6N) alloying component to require to carry out alloy melting, using nitrogen atomization technique
Carry out powder processed, powder mean particle sizes control at 10 μm；Then mild steel is adopted to weld jacket, according to final products dimensional requirement,
And consider that sintering shrinkage affects, jacket size Φ 720mm (external diameter) × 60mm (wall thickness) × 480mm (high)；Powder is loaded bag
Ram-jolt in set, and it is evacuated to 10-1Carry out sealing after Pa, after sealing, carry out HIP sintering densification, sintering temperature 1220
DEG C, pressure 100MPa, it is incubated 60min, sintering densification processes and obtains retaining ring blank, then jacket is removed, and carries out cold expanding shaping,
Deformation rate is 40%, and then annealing destressing is processed, and treatment temperature is 330 DEG C, 30 DEG C/h of heating rate, and temperature retention time is little for 10
When, 20 DEG C/h of rate of temperature fall, carry out polish process finally according to product size and roughness requirements and reach retaining ring finished product.Using
Above-mentioned technique, the tensile strength (95～105 DEG C, before cold expanding deformation) of retaining ring reaches 1295MPa, undulating value 10MPa, yield strength
Reach 1290MPa, undulating value 10MPa, elongation percentage 22%, the contraction percentage of area 62%, ballistic work 130J, average grain size is 42
μm.
(2) prepare a size of Φ 500mm (external diameter) × 40mm (wall thickness) × 400mm (high) P900NMo (18Cr-18Mn-
2Mo-0.9N) retaining ring (note：A size of size before cold expanding deformation)
It is first according to P900NMo (18Cr-18Mn-2Mo-0.9N) alloying component to require to carry out alloy melting, using nitrogen
Atomization process carries out powder processed, and powder mean particle sizes control at 80 μm；Then mild steel is adopted to weld jacket, according to final products chi
Very little requirement, and consider that sintering shrinkage affects, jacket size Φ 580mm (external diameter) × 46.4mm (wall thickness) × 464mm (high)；By powder
End loads ram-jolt in jacket, and is evacuated to 10-1Carry out sealing after Pa, after sealing, carry out HIP sintering densification, sintering
1250 DEG C of temperature, pressure 120MPa, be incubated 90min, sintering densification process obtain retaining ring blank, then jacket is removed carry out cold
Bulging deformation, deformation rate is 45%, then carries out destressing process of annealing, and treatment temperature is 350 DEG C, and 40 DEG C/h of heating rate protects
The warm time is 10 hours, 30 DEG C/h of rate of temperature fall, carries out polish process finally according to product size and roughness requirements and reaches
Retaining ring finished product.Using above-mentioned technique, the tensile strength (95～105 DEG C, before cold expanding deformation) of retaining ring reaches 1380MPa, undulating value
8MPa, yield strength reaches 1350MPa, undulating value 8MPa, elongation percentage 24%, the contraction percentage of area 62%, ballistic work 135J, averagely
Crystallite dimension is 40 μm.
Claims (1)
1. a kind of method preparing motor retaining ring using powder metallurgy high temperature insostatic pressing (HIP) Near net Shaping Technology, is characterized in that adopting powder
Metallurgical heat and other static pressuring processes substitute traditional forging deformation technique and carry out motor retaining ring shaping, and retaining ring material is P900：18Cr-
18Mn-0.6N、P900-N：18Cr-18Mn-0.9N and P2000：16Cr-14Mn-3Mo-0.9N、P900NMo：18Cr-18Mn-
2Mo-0.9N, meets requirement using pressurized Induction Melting foundry alloy and with reference to nitrogen atomization technique prepared composition, particle mean size is 5
～100 μm of powder, design jacket according to final products size and sintering shrinkage rule, jacket a size of final products cold expanding deformation
15-20% is amplified on front size basis；Powder is loaded in cylindrical or annular jacket and carries out evacuation solder up, so
After be placed in 1150-1300 DEG C in high temperature insostatic pressing (HIP) stove, pressure 70～120MPa, insulation 60-120min carry out at densification
Reason obtains retaining ring blank, then blank is carried out at cold expanding shaping and annealing destressing after jacket is fallen using machining method car
Reason, treatment temperature is 330-350 DEG C, and heating rate is less than 40 DEG C/h, and rate of temperature fall is less than 30 DEG C/h, and temperature retention time is 10-12
Hour, carry out polish finally according to product size and roughness requirements.
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| CN105903869B (en) * | 2016-04-13 | 2017-11-14 | 饶云福 | A kind of retaining ring short route manufacturing process |
| CN111024462A (en) * | 2018-10-09 | 2020-04-17 | 中国科学院金属研究所 | Sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control |
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| DE3205158C1 (en) * | 1982-02-13 | 1983-08-25 | MTU Motoren- und Turbinen-Union München GmbH, 8000 München | Capsule for hot isostatic pressing of highly stressed and complex shaped workpieces for turbomachinery |
| CN101954481B (en) * | 2010-07-07 | 2012-08-08 | 航天材料及工艺研究所 | Titanium alloy rotor near-net manufacturing method |
| CN102513537B (en) * | 2011-12-06 | 2013-07-17 | 中国航空工业集团公司北京航空材料研究院 | Method for preparing TiAl alloy plate by argon atomization in powder metallurgy |
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Inventor after: Qi Jinkun Inventor after: Fang Yucheng Inventor after: Wang Xuexin Inventor after: Ren Shubin Inventor after: Zhao Gang Inventor after: Kou Xiaolei Inventor before: Qi Jinkun Inventor before: Fang Yucheng Inventor before: Wang Xuexin Inventor before: Ren Shubin Inventor before: Zhao Gang Inventor before: Kou Xiaolei |
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Address after: 076576 Zhuolu science and Technology Park, Zhangjiakou, Hebei, China Applicant after: Hebei Wuwei aviation electrical Polytron Technologies Inc Applicant after: TAIHAI MANOIR Nuclear Power Equipment Co., Ltd. Address before: 076576 Zhuolu science and Technology Park, Zhangjiakou, Hebei, China Applicant before: Hebei Wuwei Aero & Power Technology Co.,Ltd. Applicant before: TAIHAI MANOIR Nuclear Power Equipment Co., Ltd. |
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