CN104651657A - Preparation method of enhanced type Fe-Ni-Co-based high temperature alloy through precipitation - Google Patents
Preparation method of enhanced type Fe-Ni-Co-based high temperature alloy through precipitation Download PDFInfo
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Abstract
The invention discloses a preparation method of an enhanced type Fe-Ni-Co-based high temperature alloy through precipitation and belongs to the technical field of alloy material preparation. The preparation method of the enhanced type Fe-Ni-Co-based high temperature alloy through precipitation comprises the following steps: firstly selecting pure element powder as a raw material, preparing supersaturated nanocrystalline and non-crystal mixed pre-alloyed powder by adopting a mechanical alloying technique, then putting the pre-alloyed powder into a stainless steel sheath, carrying out vacuum seal welding, then carrying out hot pressed sintering on the stainless steel sheath after vacuum seal welding is finished, and finally cooling a sintered sample, releasing pressure and breaking vacuum, so that the enhanced type Fe-Ni-Co-based high temperature alloy is obtained through precipitation. The preparation method of the enhanced type Fe-Ni-Co-based high temperature alloy through precipitation has the advantages that the stainless steel sheath is adopted for carrying out hot pressed sintering, the traditional female mould is not used any longer, and a large part can be conveniently sintered, powder flowability during sintering is improved, powder can be purified, and bulk alloy with large volume and high compactness can be prepared on the basis; and meanwhile, the preparation method of the enhanced type Fe-Ni-Co-based high temperature alloy through precipitation is easy to operate, and requirement on equipment is low.
Description
Technical field
The invention belongs to alloy material preparing technical field, be specifically related to a kind of preparation method of precipitation strength sections nickel cobalt base superalloy.
Background technology
Superalloy is highly alloyed iron-based, Ni-based or cobalt-based austenitic metal material.High temperature alloy has the irreplaceable premium properties of other material.Not only there is good hot strength and antioxidant anticorrosive performance, and antifatigue of being on active service under complex environment, creep-resistant property excellence, tissue stabilization fracture tendency is little, closely bound up with national economy, in modern national defense construction and national industry development, play more and more important role.
The superalloy trade mark of China's development probably has more than 200, its medium axle casting makes nickel-base alloy 62, directionally solidified superalloy 15, single crystal nickel base alloy 9, iron-based deforming alloy 30, nickel base deforming alloy 43, cobalt-based deforming alloy 6, dual alloy billet 20, powder metallurgy superalloy 3, ODS alloy 5 etc.Can select for aerospace and other industrial sector, but also there is no iron nickel cobalt base superalloy so far.China successively succeeds in developing three kinds of powder metallurgy superalloys, i.e. FGH4095, FGH4096 and FGH4097, and they belong to Ni based powder metallurgy superalloy.
Iron-base superalloy has good forging property, but iron the transformation of crystalline structure can occur when high temperature thus causes the bad stability of iron-base superalloy.Stability, the comprehensive mechanical property of Ni-based and cobalt base superalloy are higher, and the better performances of heat and corrosion resistant and heat-resistant anti-fatigue aspect, but the price of nickel and cobalt wants expensive many compared with the price of ferro element powder.The different characteristics of comprehensive iron, nickel, cobalt three kinds of superalloy matrix materials, by suitably increase iron content, reducing the content of strategic elemental nickel in superalloy, to obtain the high temperature alloy with stable austenite matrix and favorable comprehensive mechanical property be the new approaches preparing high temperature alloy.
It is serious that the development of powder metallurgy superalloy can well solve the segregation existed in traditional casting ingot process, the problems such as mechanical heterogeneity.China successively succeeds in developing these three kinds of powder metallurgy superalloy pre-alloyed powders and all adopts plasma rotating electrode processing powder process, HIP sintering bulk, powder manufacturing apparatus and powder sinteredly to set all costly.The strengthening phase of these three kinds of powder metallurgy superalloys has carbide and γ ' composition, and composition and strengthening phase are all comparatively complicated.
Summary of the invention
In order to overcome the defect that above-mentioned prior art exists, the object of the present invention is to provide a kind of preparation method of precipitation strength sections nickel cobalt base superalloy.
The present invention is achieved through the following technical solutions:
A kind of preparation method of precipitation strength sections nickel cobalt base superalloy, first using the pure element powder chosen as raw material, mechanical alloy metallization processes is adopted to prepare the pre-alloyed powder of over-saturation nano-crystalline and amorphous mixing, then pre-alloyed powder is placed in stainless steel jacket and carries out vacuum seal, again the stainless steel jacket after vacuum seal is carried out hot pressed sintering, finally by the sample that sintered through cooling, release and vacuum breaker process, obtained precipitation strength sections nickel cobalt base superalloy.
A preparation method for precipitation strength sections nickel cobalt base superalloy, comprises the following steps:
1) in massfraction, get the pure element powder of purity >=99.5% as raw material, comprise the carbon of 0.4% ~ 0.5%, the chromium of 17.0% ~ 19.5%, the tungsten of 2.0% ~ 3.0%, the niobium of 4.0% ~ 5.0%, the nickel of 21.5% ~ 23.5%, the cobalt of 22.5% ~ 25.5%, the molybdenum of 10.5% ~ 12.5%, surplus is iron;
2) under an inert atmosphere, raw material is placed in high energy vibration rod mill tank body, adopts mechanical alloy metallization processes to carry out rod milling process, obtain the pre-alloyed powder of over-saturation nano-crystalline and amorphous mixing;
3) pre-alloyed powder is placed in stainless steel jacket and carries out vacuum seal;
4) after soldering and sealing, stainless steel jacket is placed in hot-pressed sintering furnace hot pressed sintering, sintering temperature is 1040 DEG C ~ 1080 DEG C;
5) after having sintered, room temperature is cooled to, vacuum breaker after release, obtained precipitation strength sections nickel cobalt base superalloy sample.
Step 4) sintering schedule of described hot pressed sintering is: before 900 DEG C, pressurization is no more than 3Mpa, after 900 DEG C, be forced into 19Mpa ~ 25Mpa.
Step 4) time of hot pressed sintering is 100 ~ 140min.
Compared with prior art, the present invention has following useful technique effect:
First the present invention adopts Mechanical Alloying to prepare the pre-alloyed powder of over-saturation nano-crystalline and amorphous mixing, makes the solid solutions completely in the base such as refractory element Mo; Then, pre-alloyed powder is carried out vacuum seal in stainless steel jacket, finally jacket is carried out hot pressed sintering, thus obtain a kind of precipitation strength sections nickel cobalt base superalloy material.The present invention adopts stainless steel jacket to carry out hot pressed sintering, do not re-use traditional female mold, be conducive to sintering larger bulk part, be conducive to improving powder flowbility in sintering process yet, not only can powder cleaning, the bulk alloy that the larger density of volume is higher can also be prepared on this basis.Raw materials powder sort of the present invention is relatively less, powder process cost and powder sintered cost much relatively inexpensive, method is simple to operate, low for equipment requirements.
The iron nickel cobalt base superalloy obtained through the inventive method belongs to precipitation strength type superalloy, the High Temperature Pre powdered alloy of this kind of composition greatly reduces the usage quantity of strategic elemental nickel and uses cheap iron, sintering obtain superalloy bulk intensity compared with high, hardness is large, strengthening phase is simple, only has carbide M
6c strengthening phase, matrix is austenite, can also improve its comprehensive mechanical property further by resintering process.This iron nickel cobalt base superalloy material density is higher, and density can reach more than 8.37g/cm3, and the comprehensive mechanical property of alloy material is better.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, and the explanation of the invention is not limited.
Embodiment 1
A preparation method for precipitation strength sections nickel cobalt base superalloy, comprises the following steps:
1) in massfraction, the pure element powder getting purity >=99.5%, as raw material, comprises the carbon of 0.4%, the chromium of 17.0%, the tungsten of 2.0%, the niobium of 4.0%, the nickel of 21.5%, the cobalt of 22.5%, the molybdenum of 10.5%, and surplus is iron;
2) under an inert atmosphere, raw material is placed in high energy vibration rod mill tank body, adopts mechanical alloy metallization processes to carry out rod milling process, obtain the pre-alloyed powder of over-saturation nano-crystalline and amorphous mixing;
3) pre-alloyed powder is placed in stainless steel jacket and carries out vacuum seal;
4), after soldering and sealing, stainless steel jacket is placed in hot-pressed sintering furnace (the ZT-15-10Y series vacuum sintering funace that Shanghai Chen Hua Electric Furnace Corp Ltd. produces) hot pressed sintering, sintering temperature is 1040 DEG C, and sintering time is 140min; Sintering schedule is: before 900 DEG C, pressurization is no more than 3Mpa, after 900 DEG C, be forced into 19Mpa;
5) after having sintered, room temperature is cooled to, vacuum breaker after release, obtained precipitation strength sections nickel cobalt base superalloy sample.
Embodiment 2
A preparation method for precipitation strength sections nickel cobalt base superalloy, comprises the following steps:
1) in massfraction, the pure element powder getting purity >=99.5%, as raw material, comprises the carbon of 0.5%, the chromium of 18.0%, the tungsten of 2.3%, the niobium of 4.5%, the nickel of 22%, the cobalt of 24%, the molybdenum of 11.5%, and surplus is iron;
2) under an inert atmosphere, raw material is placed in high energy vibration rod mill tank body, adopts mechanical alloy metallization processes to carry out rod milling process, obtain the pre-alloyed powder of over-saturation nano-crystalline and amorphous mixing;
3) pre-alloyed powder is placed in stainless steel jacket and carries out vacuum seal;
4) after soldering and sealing, stainless steel jacket is placed in hot-pressed sintering furnace hot pressed sintering, sintering temperature is 1060 DEG C, and sintering time is 120min; Sintering schedule is: before 900 DEG C, pressurization is no more than 3Mpa, after 900 DEG C, be forced into 22Mpa;
5) after having sintered, room temperature is cooled to, vacuum breaker after release, obtained precipitation strength sections nickel cobalt base superalloy sample.
Embodiment 3
A preparation method for precipitation strength sections nickel cobalt base superalloy, comprises the following steps:
1) in massfraction, the pure element powder getting purity >=99.5%, as raw material, comprises the carbon of 0.5%, the chromium of 19.50%, the tungsten of 3.0%, the niobium of 5.0%, the nickel of 23.5%, the cobalt of 25.5%, the molybdenum of 12.5%, and surplus is iron;
2) under an inert atmosphere, raw material is placed in high energy vibration rod mill tank body, adopts mechanical alloy metallization processes to carry out rod milling process, obtain the pre-alloyed powder of over-saturation nano-crystalline and amorphous mixing;
3) pre-alloyed powder is placed in stainless steel jacket and carries out vacuum seal;
4) after soldering and sealing, stainless steel jacket is placed in hot-pressed sintering furnace hot pressed sintering, sintering temperature is 1080 DEG C, and sintering time is 100min; Sintering schedule is: before 900 DEG C, pressurization is no more than 3Mpa, after 900 DEG C, be forced into 25Mpa;
5) after having sintered, room temperature is cooled to, vacuum breaker after release, obtained precipitation strength sections nickel cobalt base superalloy sample.
The key of material prepared by the present invention and preparation method is:
1, nano-crystalline and amorphous state mixed phase powdered alloy is obtained by Mechanical Alloying;
2, mechanical alloying is obtained powdered alloy and carry out vacuum canning soldering and sealing;
3, jacket hot pressed sintering.
Finally obtain M
6c carbide is as main fortifier, and austenite is the two-phase superalloy of matrix.
The composition of the composition of the strengthening sections nickel cobalt base superalloy that the inventive method obtains, room-temperature mechanical property and domestic three kinds of superalloys is as shown in table 1:
Table 1
As can be seen from Table 1, found by contrast, this kind of Novel powder metallurgy superalloy is elementary composition by eight kinds of constituent elements, is respectively Fe, these 8 kinds of essences of Ni, Co, Mo, Cr, W, Nb, C.And by contrast, the component of these three kinds of powder metallurgy high-temperature alloys of FGH4095, FGH4096, FGH4097 reaches tens kinds, composition is more complicated various.Enhance workload and the cost of powder preparation.Three kinds of domestic powder metallurgy high-temperature alloys contain a large amount of nickel, and its mass percent is between 55% ~ 65%, and nickel belongs to strategic element, and price is relatively costly.This kind of Novel powder metallurgy superalloy, by the use suitably using iron to replace nickel element, greatly reduces the usage quantity of nickel, reduces raw materials cost.
The room-temperature mechanical property contrast that the present invention obtains Novel powder metallurgy iron nickel cobalt base superalloy is as shown in table 2:
Table 2
As can be seen from Table 2, Novel powder metallurgy iron nickel cobalt base superalloy density, hardness and yield strength that the present invention obtains all obviously are better than existing equivalents, describe this kind of superalloy and have broad prospect of application and practical value more than other three kinds of superalloys in high-hardness, wearable.These three kinds of superalloys of picture FGH4095, FGH4096, FGH4097 are the same, can significantly improve its plasticity and toughness by suitable heat treatment.Therefore illustrate that this kind of superalloy has high cost performance in civilian and national defence superalloy field, application prospect is extensive.
Claims (4)
1. the preparation method of a precipitation strength sections nickel cobalt base superalloy, it is characterized in that, first using the pure element powder chosen as raw material, mechanical alloy metallization processes is adopted to prepare the pre-alloyed powder of over-saturation nano-crystalline and amorphous mixing, then pre-alloyed powder is placed in stainless steel jacket and carries out vacuum seal, again the stainless steel jacket after vacuum seal is carried out hot pressed sintering, finally by the sample that sintered through cooling, release and vacuum breaker process, obtained precipitation strength sections nickel cobalt base superalloy.
2. the preparation method of a kind of precipitation strength sections nickel cobalt base superalloy according to claim 1, is characterized in that, comprise the following steps:
1) in massfraction, get the pure element powder of purity >=99.5% as raw material, comprise the carbon of 0.4% ~ 0.5%, the chromium of 17.0% ~ 19.5%, the tungsten of 2.0% ~ 3.0%, the niobium of 4.0% ~ 5.0%, the nickel of 21.5% ~ 23.5%, the cobalt of 22.5% ~ 25.5%, the molybdenum of 10.5% ~ 12.5%, surplus is iron;
2) under an inert atmosphere, raw material is placed in high energy vibration rod mill tank body, adopts mechanical alloy metallization processes to carry out rod milling process, obtain the pre-alloyed powder of over-saturation nano-crystalline and amorphous mixing;
3) pre-alloyed powder is placed in stainless steel jacket and carries out vacuum seal;
4) after soldering and sealing, stainless steel jacket is placed in hot-pressed sintering furnace hot pressed sintering, sintering temperature is 1040 DEG C ~ 1080 DEG C;
5) after having sintered, room temperature is cooled to, vacuum breaker after release, obtained precipitation strength sections nickel cobalt base superalloy sample.
3. the preparation method of a kind of precipitation strength sections nickel cobalt base superalloy according to claim 2, it is characterized in that, step 4) sintering schedule of described hot pressed sintering is: before 900 DEG C, pressurization is no more than 3Mpa, after 900 DEG C, be forced into 19Mpa ~ 25Mpa.
4. the preparation method of a kind of precipitation strength sections nickel cobalt base superalloy according to claim 2, is characterized in that, step 4) time of hot pressed sintering is 100 ~ 140min.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107059075A (en) * | 2017-01-24 | 2017-08-18 | 江苏协鑫软控设备科技发展有限公司 | The plating solution and coating and polycrystalline silicon ingot or purifying furnace of amorphous nickel tungsten-molybdenum alloy |
| CN108425061A (en) * | 2018-03-02 | 2018-08-21 | 西安赛隆金属材料有限责任公司 | A kind of alloy and preparation method thereof |
| CN109811279A (en) * | 2019-01-21 | 2019-05-28 | 北京科技大学 | A kind of fibre reinforced metal-based high-temperature composite material and preparation method thereof |
| CN111455254A (en) * | 2020-05-08 | 2020-07-28 | 华能国际电力股份有限公司 | Low-cost easy-processing iron-nickel-cobalt-based high-temperature alloy and preparation method thereof |
| CN113732285A (en) * | 2021-11-05 | 2021-12-03 | 西安赛隆金属材料有限责任公司 | Iron-nickel-cobalt-based powder alloy and method for improving elongation thereof |
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| CN102127672A (en) * | 2011-02-22 | 2011-07-20 | 中南大学 | Method for preparing iron-base superalloy by extrusion forming of gas atomized powder |
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| CN102127672A (en) * | 2011-02-22 | 2011-07-20 | 中南大学 | Method for preparing iron-base superalloy by extrusion forming of gas atomized powder |
| CN102605278A (en) * | 2012-03-13 | 2012-07-25 | 周子超 | High-temperature alloy and hot isostatic pressing sintering method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107059075A (en) * | 2017-01-24 | 2017-08-18 | 江苏协鑫软控设备科技发展有限公司 | The plating solution and coating and polycrystalline silicon ingot or purifying furnace of amorphous nickel tungsten-molybdenum alloy |
| CN108425061A (en) * | 2018-03-02 | 2018-08-21 | 西安赛隆金属材料有限责任公司 | A kind of alloy and preparation method thereof |
| CN109811279A (en) * | 2019-01-21 | 2019-05-28 | 北京科技大学 | A kind of fibre reinforced metal-based high-temperature composite material and preparation method thereof |
| CN111455254A (en) * | 2020-05-08 | 2020-07-28 | 华能国际电力股份有限公司 | Low-cost easy-processing iron-nickel-cobalt-based high-temperature alloy and preparation method thereof |
| CN113732285A (en) * | 2021-11-05 | 2021-12-03 | 西安赛隆金属材料有限责任公司 | Iron-nickel-cobalt-based powder alloy and method for improving elongation thereof |
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