CN110343908A - The hip moulding and heat treatment process of IN718 alloy powder and its alloy - Google Patents
The hip moulding and heat treatment process of IN718 alloy powder and its alloy Download PDFInfo
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- 238000001816 cooling Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 238000011282 treatment Methods 0.000 claims description 8
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- 229910052742 iron Inorganic materials 0.000 claims description 5
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Classifications
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- B22F1/0003—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/056—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 10% but less than 20%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
Abstract
The present invention relates to powder metallurgy superalloy manufacturing technology fields, disclose the hip moulding and heat treatment process of a kind of IN718 alloy powder and its alloy, the technique includes Powder hot isostatic pressure and two stages of heat treatment, the IN718 alloy powder oxygen content of gas atomization preparation is low to can inhibit the primary granule border for generating carbide composition, since powder particle is tiny, setting rate is fast, oxygen content is low, it is uniform with ingredient, without gross segregation, part performance is stablized, and can shape only and the advantages that thermal processing distortion better performances.After Powder hot isostatic pressure molding (HIP) and heat treatment process, alloy Laves phase is few, is dissolved more alloying elements uniformly.Stages of Aging be precipitated more precipitation phase γ ' mutually with γ " phase.Shrinkage cavity and loose is effectively avoided, and reduces harmful phase to a certain extent, its good plasticity can be kept while reinforced alloys, to realize intensity improvement synchronous with plasticity.
Description
Technical field
The present invention relates to powder metallurgy superalloy preparation and high temperature alloy technical field of heat treatment, in particular to a kind of IN718
The hip moulding and heat treatment process of alloy powder and its alloy.
Background technique
Inconel718 alloy has been invented in nineteen fifty-nine by International nickel Co. Ltd. Inco. Ltd., the U.S., and nickel base superalloy IN718 is a kind of
Deposition hardening type nichrome, its main hardening constituent are γ ' phase (Ni3 (Al, Ti, Nb) face-centered cubic) and γ " phase
(Ni3Nb body-centered tetragonal).With good high temperature creep strength, anti-fatigue performance, anti-oxidant and hot corrosion resistance.Due to
Hardening constituent precipitation is slow, has good solderability and castability；Intensity with higher under high temperature (650 DEG C)；It is good
Ductility makes it easier to receive various forms of processing.It is the key that Aeronautics and Astronautics and nuclear energy, oil field widely apply material
Material.
At present, IN718 alloy production preparation process is mainly forging extruding thermal deformation and to carry out hot place after melting and casting
Reason, the tissue of alloy is especially sensitive to processing technology, therefore must be strictly controlled various processes, but there are some for the technique
Often there is loose, shrinkage cavity in IN718 high temperature alloy as-cast structure, both since alloying level is high, freezing range is wide in problem
The effective sectional area for reducing casting also increases and the possibility that stress is concentrated occurs, seriously affects the intensity and plasticity of casting.Its
Secondary, in alloy graining process, higher melting-point element is done along dendrite first to be solidified, and lower melting-point element is then gathered in dendrite
In gap, the elements such as big Nb of the Ni atomic radius of γ matrix comparison at the same time have repulsive interaction, inclined so as to cause alloy
Analysis is serious, often forms the harmful phases such as a large amount of Laves or massive carbide in interdendritic, easily becomes formation of crack or extension is logical
Road, to reduce the mechanical property of casting.The content of Nb element is very high in IN718 alloy, and Nb member is formed when ingot solidification crystallizes
Element segregation can form the brittleness Laves phase of white in interdendritic, usually get together with MC carbide；It is rich in around Laves phase
Nb element, while needle-shaped δ phase is precipitated.The presence of the Laves phase will lead to the impact property of material and plasticity drastically reduces, and be easy
Cause cracking during alloy pig cogging.Degree of segregation in alloy pig will have a direct impact on the uniform of alloy structure and performance
Property, and be difficult to control the tissue in subsequent forging process.
For the use reliability for improving casting, it will generally pass through hip treatment.On the one hand component segregation can be made equal
It homogenizes；On the other hand microporosity and internal shrinkage can be closed, under ideal conditions, hot isostatic pressing can also be closed it is biggish not
The shrinkage cavity communicated with surface, from the point of view of current hot isostatic pressing practical condition, for various reasons, hot isostatic pressing improves
The effect of IN718 alloy-steel casting performance plays bad, can even bring adverse effect sometimes.
In terms of melting, improving the most important technology of segregation is to carry out Homogenization Treatments, is heated at high temperature by long-time, is promoted
Make solute element atom diffusive migration in alloy, reduces limb and interdendritic concentration of element.But Homogenization Treatments are for
The gross segregations such as the blackspot or hickie of formation can not be eliminated and improve.From the point of view of research conditions both domestic and external, powder is utilized
Metallurgical method preparation IN718 high temperature alloy is to improve the most fruitful means of alloy stability, forges high temperature alloy with traditional casting
Compare, powder metallurgy superalloy with no gross segregation, ingredient even tissue, crystal grain is tiny, can closely shape, thermodynamic property and power
Learn the advantages that functional.In addition, prepare high temperature alloy using powder metallurgy process has in simplified technique, drop low cost aspect
Some superiority.Therefore mother alloy ingot is prepared by casting method, then prepares powder, hot isostatic pressing compression moulding, production is to the greatest extent
Powder metallurgy that may be clean is to prepare qualified part or profile.
Carbide size is big in the alloy of elevated oxygen level, and is focusing more on grain boundary, to form more quality
Hard and crisp PPB hinders crystal grain recrystallization；And it is also easy to produce pile-up of dislocation and stress concentration, therefore be easy in PPB and matrix circle
Source is cracked at face, to reduce alloy plasticity.The presence of PPB reduces the binding force between particle, at high temperature crystal boundary
Weakening degree more very, in grain boundaries is easier to crack initiation, therefore low oxygen content powder is selected to prepare alloy.
The main hardening constituent of IN718 alloy has γ ' ' (Ni3Nb) and γ ' (Ni3 (Al, Ti)), wherein γ ' ' Xiang Nengbao
Demonstrate,proving alloy has high-intensitive essential condition.Both intensity, tensile strength, fatigue life for strengthening the golden material that is involutory play
Very important effect.The precipitation of traditional IN718 alloy production process intensification phase is relatively difficult, because γ ' ' and γ ' is precipitated
Slowly, and due in production process cooling velocity it is too fast, have little time precipitation strength phase.Material at this time is partially soft, and intensity is not high, institute
To need using heat treatment process appropriate to make that equally distributed γ ' ' and γ ' reinforcing is precipitated in object phase after hot isostatic pressing
Phase.By carrying out heat treatment adjustment to alloy, thus control γ ' ' (Ni3Nb), γ ' (Ni3 (Al, Ti)), δ pattern, point
Cloth and quantity, control the grain size of alloy, so that the mechanical property of different stage is obtained, to meet the needs of different application.
In conclusion explore it is a kind of high performance IN718 alloying technology is produced by powder metallurgy and heat treatment,
To there is certain directive significance to production.
Summary of the invention
Goal of the invention: aiming at the problems existing in the prior art, the present invention provides a kind of IN718 alloy powder and its alloy
Hip moulding and heat treatment process, gas-atomized powder guarantee powder oxygen content under the premise of, powder is located in advance
Reason is to eliminate PPB, subsequent progress hot isostatic pressing powder compacting and heat treatment, and in refinement crystal grain, reduction is mingled with, and it is crisp to reduce nitride
Property phase precipitation while, reduce segregation and brittleness Laves and needle-shaped δ phase；It is precipitated slowly
Equally distributed γ ' ' and γ ' hardening constituent guarantee mechanical property.
Technical solution: the present invention provides a kind of IN718 alloy powders, mainly include following components in percentage by weight:
C :≤0.05%, Nb:4.75~5.5%, Mo:2.80~3.30%, Cu :≤0.35%, Si:0.30~0.50%, Mn :≤0.35%,
Ti:0.65~1.15%, Al:0.40~0.70%, Cr:17~21%, S :≤0.015%, Co :≤1%, Fe:17~19, Ni are remaining
Amount.
Preferably, the IN718 alloy powder mainly includes following components in percentage by weight: C :≤0.025%, Nb:
5.12%, Mo:3.14, Cu:0.13%, Si:0.35%, Mn:0.28%, Ti:0.79%, Al:0.55%, Cr:18.75%, S :≤
0.008%, Co:0.089%, Fe:17.53%, Ni are surplus.
The present invention also provides the hip mouldings and heat treatment process of a kind of IN718 powder metallurgy, including following step
It is rapid: S1: after IN718 alloy powder is placed in jolt ramming in jacket, sealing, degassing, to carry out hip moulding, obtain hot isostatic pressing
Part；The technique of the hip moulding are as follows: with 15 DEG C of min-1Heating rate from room temperature to 1180 DEG C, then apply
Furnace cooling after the pressure heat insulating pressure maintaining 4h of 170MPa；S2: will be cooled to the hot isostatic pressing part of room temperature under an inert atmosphere into
Row solid solution plus aging strengthening model；The solid solution plus aging thermal treating process are as follows: with the heating rate of 15 DEG C/min from room temperature
To 965 DEG C, air-cooled carry out solution treatment after 1.5h is kept the temperature, is then warming up to 720 DEG C with the heating rate of 10 DEG C/min, keeps the temperature 8h
Afterwards, 620 DEG C are cooled to the furnace with the cooling velocity of 50 DEG C/h, is taken out after heat preservation 8h air-cooled；S3: remove the sheath material to obtain the final product
Finished product IN718 powder metallurgy.
In the S1, the IN718 alloy powder is by being cast into base material stick after vacuum melting, then through gas atomization
Preparation.
The partial size of the IN718 alloy powder is 200 μm or so.
The oxygen content of the IN718 alloy powder is 130 × 10-6 。
In the S1, the furnace cooling answers temperature control to be cooled to not a half hour.Temperature control cooling is to start to drop in order to prevent
Warm excessive velocities.
The utility model has the advantages that being had the advantage that by IN718 nickel-base alloy prepared by this method
(1) powder has the advantages that sphericity is high, and satellite ball is few, and ingredient is uniform, and oxygen content is few, closes compared to more traditional casting
Gold, microporosity in traditional casting, Laves phase, the serious defect of component segregation can be eliminated by being handled by powder HIP, centainly
Mitigate in degree and be segregated and promote to homogenize, the purity for improving alloy reduces nonmetal inclusion, to improve casting plasticity, simultaneously
A series of conventional middle process are also eliminated, are reduced costs.
(2) IN718 can promote solute element atom diffusive migration in alloy by long heat treatment after HIP, reduce
Limb and interdendritic concentration of element, while obtaining suitable grain size.γ in alloy " and the precipitation of γ ' hardening constituent are more and uniform,
The effect of alloy strengthening can be played.Reduce high niobium nocuousness brittleness Laves phase, improves the breaking strength and plasticity of alloy.
(3) after HIP and heat treatment, no needle-shaped δ phase is precipitated, while retaining " the fine lines " of hot isostatic pressing formation.
(4) wherein room temperature tensile intensity is 1352MPa, yield strength 1294.2MPa, elongation percentage 14.7%.It is protected at 650 DEG C
The drawing by high temperature tensile strength of warm 30min is 1075MPa, and elongation percentage 21.5%, the enduring quality of 690MPa is > at 650 DEG C
150h, much higher than the mechanical property of as cast condition under same experiment condition.
Compared with prior art, the IN718 alloy powder that the present invention is prepared by pretreatment by gas atomization, since it contains
Oxygen amount is low to can inhibit the primary granule border for generating carbide composition.Furthermore traditional casting can solve by powder metallurgy process
The ingotism problem of IN718 high temperature alloy, so that the IN718 alloy of excellent in mechanical performance is prepared, since powder particle is tiny,
Setting rate is fast, and oxygen content is low, has ingredient uniform, and no gross segregation, part performance is stablized, and can shape only and thermal processing distortion
The advantages that better performances.After Powder hot isostatic pressure molding (HIP) and heat treatment process, alloy Laves phase is few, makes more
More alloying elements are uniformly dissolved.Stages of Aging be precipitated more precipitation phase γ ' mutually with γ " phase.To a certain degree
On avoid shrinkage cavity and loose, and reduce harmful phase to a certain extent, meanwhile, can keep it good while reinforced alloys
Plasticity, thus realize intensity it is synchronous with plasticity improve.
Choice of powder hot isostatic pressing method (HIP) of the present invention prepares IN718 alloy, subsequent to be heat-treated again.Using vacuum
Mother alloy ingot after melting prepares powder through gas atomization, because its, simple process small with environmental pollution, cooling velocity are fast etc.
Advantage is widely used, at the same prepared powder sphericity is high, oxygen content is low, ingredient is uniform, crystal grain is tiny, powder size can
Control, stable material performance is provided for subsequent hip moulding.
Compared with existing cast nickel-base alloy, the cooling procedure of hip treatment is very slow, is equivalent to high temperature
Annealing after being heat-treated using secondary ageing, can make transgranular lenticular γ ' ' the phase that small and dispersed distribution has been precipitated, γ ', δ
Equal hardening constituents, while reducing the precipitation of the brittlement phases such as Laves.Traditional casting forging high temperature alloy ingotism is serious, pressure processing
Performance is poor, and tissue is difficult to control in subsequent forging process.The alloy prepared using technique of the invention, processing performance
Good, mechanical property is good, and available almost segregation-free, crystal grain is tiny, even tissue high-temperature alloy material.
The present invention has large development prospect in fields such as aerospace, nuclear energy and petrochemical industries, utilizes powder metallurgy side
Method, which prepares high temperature alloy, in simplified technique, drop low cost aspect there is some superiority therefore all to greatly develop Ni-based powder both at home and abroad
Last high temperature alloy.Powder metallurgy superalloy is mainly for the manufacture of the compressor disc of aero-engine, the turbine disk, turbine rings, whirlpool
The high temperature load component such as wheel shaft.Manufacturing procedure and reduction can be reduced using direct HIP and subsequent heat treatment technique manufacture part
The consumption of raw material, to reduce production cost.
Detailed description of the invention
Fig. 1 is the SEM figure of IN718 alloy powder used in the present invention；
Fig. 2 is the metallographic structure figure of IN718 alloy powder used in the present invention；
Fig. 3 is DSC and TG curve graph of the IN718 alloy powder at 0~1000 DEG C used in the present invention；
Fig. 4 is the metallographic structure figure of 200 times of amplification after hot isostatic pressing of the present invention；
Fig. 5 be after hot isostatic pressing of the present invention after subsequent heat treatment 500 times of metallographic structure figure of amplification.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawing.
Present embodiments provide for a kind of high-performance IN718 alloy powders, mainly include following components in percentage by weight:
C :≤0.025%, Nb:5.12%, Mo:3.14, Cu:0.13%, Si:0.35%, Mn:0.28%, Ti:0.79%, Al:0.55%, Cr:
18.75%, S :≤0.008%, Co:0.089%, Fe:17.53%, Ni are surplus.
Table 1 is IN718 alloy powder particle diameter distribution, specific surface area, oxygen-containing nitrogen quantity used in present embodiment
The oxygen content in power is low as can be seen from Table 1, and powder diameter is about 130~150 μm, can guarantee subsequent IN718 heat etc.
The quality of static pressure, while reducing the generation of powder particle boundary phenomenon and the precipitation of PPB brittlement phase.
Hip moulding and the heat treatment process of above-mentioned IN718 powder metallurgy the following steps are included:
S1: IN718 alloy powder then will be prepared through gas atomization by being cast into base material stick after vacuum melting, partial size is
200 μm or so, oxygen content is 150 × 10-6.Through jolt ramming screening, remove impurity removing after, after be dried, drying temperature 60
DEG C, drying time 2h.
Fig. 1 is that the SEM of above-mentioned IN718 alloy powder schemes；The good sphericity of powder as seen from the figure, satellite ball are few.
Fig. 2 is the metallographic structure figure of above-mentioned IN718 alloy powder；
Fig. 3 is DSC and TG curve graph of the above-mentioned IN718 alloy powder at 0~1000 DEG C；
S2: being polished stainless steel capsule and cleaned, is stained with gasoline with clean calico and is wiped repeatedly jacket inner wall and inside pipe wall,
The jacket cleaned is selected into argon arc welding welding again, and deaeration pipe insertion circular hole is subjected to two-sided welding.By jacket entire combination
Together, the defects of having gone through pore-free, welding slag should carry out repair welding if jacket is defective at this, keep good
Air-tightness；Body is cleaned with high pressure draught, prevents from retaining welding slag in set.
S3: jacket is placed on a vibration table, IN718 alloy powder is poured into along jacket wall, pine is filled to entire jacket；
Jacket is fixed on a vibration table, shake table is opened, amplitude 3.5mm, vibration frequency is by 100-350 beats/min；Not with vibration
It is disconnected that IN718 alloy powder is added, when the jolt ramming of IN718 alloy powder is on jacket along 15mm or so, stop vibration, at this time
Resonance is 1000 times or so dynamic, covers upper cover and seals deaeration pipe upper port, welds jacket upper cover.
S4: the jacket after suppressing is completely immersed in observation in the leak detection container for fill with clean water bubble-free generation, emphasis
Commissure is observed, if bubble-free generates, it was demonstrated that there is no gas leakage, otherwise repair welding is carried out in air-leak section, repeatedly until no infiltration
Until leakage.
S5: the jacket that dress powder finishes is sent into degasification furnace and is de-gassed.Degassing temperature is 550 DEG C, and vacuum degree is less than 2 × 10? 38-10h is kept after Pa.
S6: the effective oxyacetylene torch that will deaerate is baked to red heat, complete after clamp to cut extra exhaust tube, and will be stitched with welding wire
Gap is shut.Clamp should clamp three from top to bottom, per pass spacing about 10mm；
S7: the good jacket of soldering and sealing is sent into hot isostatic press, and HIP technique is with 15/ DEG C of .min-1Heating rate be warming up to 1180
DEG C, then apply furnace cooling after 170MPa pressure heat insulating pressure maintaining 4h.Temperature control cooling half an hour is answered in furnace cooling, prevents from starting to drop
Warm excessive velocities.
Fig. 4 is the metallographic structure figure of 200 times of amplification after hot isostatic pressing.
S8: the hot isostatic pressing part for being cooled to room temperature is put and is heat-treated into inert atmosphere furnace.Heat treatment process is
Solid solution plus ageing treatment.965 DEG C of air-cooled carry out solution treatment of heat preservation 1.5h are specially risen to the heating rate of 15 DEG C/min, with
720 DEG C of heat preservation 8h are warming up to so that γ ' ' and γ ' is precipitated with the rate of 10 DEG C/min afterwards, are furnace-cooled to the cooling velocity of 50 DEG C/h
It is air-cooled that 620 DEG C of heat preservation 8h continue taking-up after γ ' is precipitated.Heat treatment should carry out under inert gas protection, strict control alloy
Grain size and reduction component segregation.
Fig. 5 is to amplify 500 times of metallographic structure figure after subsequent heat treatment after hot isostatic pressing.It is quiet through heat etc. as seen from the figure
After pressure and heat treatment, alloy grain is tiny, and a large amount of hardening constituent is precipitated.
S9: being machined to completely remove surface sheath material on the lathes such as lathe or planer, then wire cutting to similar to
Product size (attention must reserve machining allowance), finally finished size is arrived in fine grinding.
Table 2 is the mechanical property of alloy obtained by present embodiment
After carrying out heat treatment process again by hot isostatic pressing as can be seen from Table 2, IN718 alloy obtains excellent mechanical property
Energy.
The technical concepts and features of above embodiment only to illustrate the invention, its object is to allow be familiar with technique
People cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent transformation or modification that Spirit Essence is done, should be covered by the protection scope of the present invention.
Claims (7)
1. a kind of IN718 alloy powder, which is characterized in that mainly include following components in percentage by weight: C :≤0.05%, Nb:
4.75~5.5%, Mo:2.80~3.30%, Cu :≤0.35%, Si:0.30~0.50%, Mn :≤0.35%, Ti:0.65~
1.15%, Al:0.40~0.70%, Cr:17~21%, S :≤0.015%, Co :≤1%, Fe:17~19, Ni are surplus.
2. a kind of IN718 alloy powder, which is characterized in that mainly include following components in percentage by weight: C :≤0.025%,
Nb:5.12%, Mo:3.14, Cu:0.13%, Si:0.35%, Mn:0.28%, Ti:0.79%, Al:0.55%, Cr:18.75%, S :≤
0.008%, Co:0.089%, Fe:17.53%, Ni are surplus.
3. a kind of hip moulding and heat treatment process of IN718 powder metallurgy, which comprises the following steps:
S1: after IN718 alloy powder is placed in jolt ramming in jacket, sealing, degassing, hip moulding is carried out, hot isostatic pressing is obtained
Part；
The technique of the hip moulding are as follows: with 15 DEG C of min-1Heating rate from room temperature to 1180 DEG C, then apply
Add furnace cooling after the pressure heat insulating pressure maintaining 4h of 170MPa；
S2: the hot isostatic pressing part for being cooled to room temperature is carried out to solid solution plus aging strengthening model under an inert atmosphere；
The solid solution plus aging thermal treating process are as follows: with the heating rate of 15 DEG C/min from room temperature to 965 DEG C, keep the temperature 1.5h
Air-cooled carry out solution treatment afterwards is then warming up to 720 DEG C with the heating rate of 10 DEG C/min, after keeping the temperature 8h, with the cold of 50 DEG C/h
But speed cools to 620 DEG C with the furnace, takes out after heat preservation 8h air-cooled；
S3: it removes the sheath material and gets product IN718 powder metallurgy.
4. the hip moulding and heat treatment process of IN718 powder metallurgy according to claim 3, which is characterized in that
In the S1, then the IN718 alloy powder is prepared by being cast into base material stick after vacuum melting through gas atomization.
5. the hip moulding and heat treatment process of IN718 powder metallurgy according to claim 3, which is characterized in that institute
The partial size for stating the IN718 alloy powder is 200 μm or so.
6. the hip moulding and heat treatment process of IN718 powder metallurgy according to claim 3, which is characterized in that institute
The oxygen content for stating the IN718 alloy powder is 130 × 10-6 。
7. the hip moulding and heat treatment process of IN718 powder metallurgy according to claim 3, which is characterized in that
In the S1, the furnace cooling answers temperature control to be cooled to not a half hour.
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