CN112159930B - High-speed train brake disc material with stable friction coefficient and preparation method thereof - Google Patents
High-speed train brake disc material with stable friction coefficient and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/20—Measures not previously mentioned for influencing the grain structure or texture; Selection of compositions therefor
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- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/145—Chemical treatment, e.g. passivation or decarburisation
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- 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
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/12—Discs; Drums for disc brakes
- F16D65/125—Discs; Drums for disc brakes characterised by the material used for the disc body
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- 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
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/041—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by mechanical alloying, e.g. blending, milling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0004—Materials; Production methods therefor metallic
- F16D2200/0008—Ferro
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0082—Production methods therefor
Abstract
The invention discloses a high-speed train brake disc material with stable friction coefficient, which comprises the following raw materials in parts by weight: c: 0.20-0.35%; si: 0.21 to 0.31 percent; mn: 0.68-1.19%; v: 0.18-0.42%; cr: 1.07-2.54%; ni: 0.89 to 2.33 percent; mo: 0.17-0.39%; cu: 0.12-0.75%; p: 0.005-0.01%; s: 0.005-0.01%; al: 2.55-4.38%; the balance being Fe. The invention also discloses a preparation method of the high-speed train brake disc material with stable friction coefficient. The brake disc material has Fe dispersed in crystal in the structure3Al ultrafine phase, Fe3The Al superfine phase has low thermal expansion coefficient and high hardness, and the friction performance of the Al superfine phase does not cause fluctuation of the friction performance along with the change of braking conditions such as friction temperature and the like, so that the friction disc has stable friction coefficient in the braking process.
Description
Technical Field
The invention relates to a high-speed train brake disc material with a stable friction coefficient and a preparation method thereof, belonging to the technical field of friction materials for braking of high-speed trains.
Background
With the rapid development of national economy and the rapid development of high-speed railway careers in China, high-speed railways cover 28 provinces and over 160 land-level cities in China. The four longitudinal and four transverse main lines are basically formed, and the high-speed rail running mileage stably occupies the top of the world high-speed rail mileage list. The United release of China reform Commission, department of transportation and China railway company in 2016 jointly releases 'Medium and Long term railway network planning' (2016 & lt 2030), the planning clearly indicates that in the national region, the 'eight vertical and eight horizontal' high speed railway transportation network is estimated to increase from 1.9 kilometers at the end of 2015 to 3 kilometers in 2020, and the blueprint further promotes the development of the high speed railway industry in China.
The train brake reliability is the core factor of the safe operation of the high-speed train, the current train brakes are mainly divided into friction brake, dynamic brake and electromagnetic brake according to the brake force generation mode, the dynamic brake and the electromagnetic brake play more and more obvious roles along with the continuous innovative development of the technology, but the international railway union UIC still stipulates: when other braking modes fail in the running process of the high-speed train, the friction braking must ensure that the train can stop within a specified distance so as to ensure the safe running of the train.
An early friction braking mode used by railway trains is brake shoe braking, also called tread braking, and braking force is mainly formed by friction between brake shoes and wheels. Most heat is absorbed by the wheels in the brake process of the brake shoes, the heat generated by braking is increased along with the continuous increase of the speed of the train, and the wheels are easy to peel or crack due to temperature rise. Due to the problems of poor kinetic energy transfer capability, low braking efficiency, single friction pair selection and the like, the brake shoe brake cannot meet the requirement of high-power braking performance required along with the increase of the train speed.
In the beginning of the 20 th century, disc brake devices were developed, which mainly use brake pads to clamp a brake disc mounted on the side of a wheel of a vehicle disc or an axle to generate braking force, so that the wheel does not need to bear braking load, and further the service life of the wheel is prolonged. Meanwhile, the brake disc has low requirements on brake pad materials, and both the semimetal-based synthetic brake pad and the powder metallurgy brake pad can be matched with the brake pad. The excellent friction braking performance of the high-speed brake disc can ensure the safe stop of the train at short distance, and the production and manufacturing technology of the high-speed brake disc serving as a key component of a friction braking system is one of important factors limiting the technical development of the high-speed train.
With the development of the high-speed railway business in China, the trains in China need to face the working conditions of long regional span and long-time friction while running at an increased speed, so that new requirements are provided for the friction stability and the low-temperature toughness matching property of the friction discs of the trains, and the problems of insufficient friction stability and large low-temperature brittleness tendency caused by long-distance friction and environmental temperature difference caused by different regions in the south and north are solved.
In summary, those skilled in the art need to research a highly stable train brake disc material and a preparation method thereof to solve the problems of insufficient friction stability and large low temperature brittleness tendency of a high-speed train brake disc.
Disclosure of Invention
The invention aims to solve the technical problem that the train brake disc material can solve the problems of insufficient friction stability and large low-temperature brittleness tendency of a high-speed train brake disc.
Meanwhile, the invention provides a preparation method of the high-speed train brake disc material with stable friction coefficient.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a high-speed train brake disc material with a stable friction coefficient comprises the following raw materials in percentage by mass:
a preparation method of a high-speed train brake disc material with a stable friction coefficient comprises the following steps:
s1, proportioning brake disc elements according to the component requirements, adding the brake disc elements into an electric furnace, heating to 1580-1690 ℃, and fully melting to obtain molten steel;
s2, adding a nucleating agent into the fully molten steel, and then casting into ingots;
s3, forging by adopting multidirectional die forging to obtain a forging blank;
and S4, performing three-stage performance heat treatment on the obtained forging blank through normalizing, quenching and tempering to obtain the high-stability train brake disc material.
Fe is dispersed and distributed in the crystal of the brake disc material with the stable friction coefficient3Al superfine phase.
The nucleating agent is spherical shell structure nano Fe3Al@Al2O3。
The spherical shell structure is nano Fe3Al@Al2O3The preparation method comprises the following steps:
s201, proportioning Fe powder and Al powder with the particle size of 50-100 nm according to the atomic ratio of 3:1, placing the mixture into a high-purity argon protection vacuum high-energy ball mill, carrying out ball milling for 3-5 h at 500-800 rpm, cooling completely, and taking out the cooled mixture in a vacuum glove box filled with argon protection to obtain mixed powder;
s202, placing the ball-milled mixed powder in a vacuum tube furnace at a temperature of 3 x 10-3～1×10-3Preserving heat for 1-2.5 h under the conditions of MPa and 1350-1480 ℃, and then cooling to room temperature;
s203, putting the mixed powder cooled in the S202 furnace into a hydrazine solution with the concentration of 0.8-1.5 mol/L and the temperature of 38-45 ℃ for etching for 13-25 h, then filtering, ultrasonically cleaning with alcohol, and drying to obtain the spherical shell structure nano Fe3Al@Al2O3。
The spherical shell structure is nano Fe3Al@Al2O3Is made of Fe3Al as core, outside of the coreIn situ generation of Al2O3Shell layer of Al2O3A plurality of pores are uniformly distributed on the shell layer.
In S3, the start forging temperature of the multidirectional die forging is 1050 ℃, the finish forging temperature is 900 ℃, and the forging ratio is more than 3.5: 1.
In S4, the three-stage performance heat treatment of normalizing, quenching and tempering is as follows: normalizing: heating to 900 ℃, preserving heat for 0.8-1 h, and then air cooling to room temperature; quenching: heating to 900 ℃ followed by oil cooling to room temperature; tempering: heating to 550 ℃, preserving heat for 2-4 h, and then furnace cooling to room temperature.
Said Fe3The grain size of the Al superfine phase is 5-30 μm.
The invention has the following beneficial effects:
1. the stability is high: after the brake disc material is smelted, crystallized and forged, Fe is dispersedly distributed in the crystal in the structure3Al superfine phase. Fe3The Al superfine phase has low thermal expansion coefficient and high hardness, and the friction performance of the friction disc does not change along with the braking environment such as friction temperature and the like to cause fluctuation of the friction performance in the use process of the friction disc, so that the friction disc has stable friction coefficient in the braking process.
2. Low temperature brittleness tendency is small: fe dispersed in the crystal in the tissue of the invention3The Al superfine phase belongs to a D03 type structure, has good low-temperature toughness, and Fe distributed in the brake disc structure3The Al superfine phase can obviously reduce the low-temperature brittleness of the friction disc, so that the low-temperature braking performance of the friction disc is greatly improved.
3. The cost is low: the brake disc material disclosed by the invention has the advantages that the contents of Ni and Mo are reduced, the content of Al is increased, the material cost is greatly reduced, and the performance of the material is ensured.
Drawings
Fig. 1 is a structural diagram of a highly stable train brake disc material of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting.
Example 1:
as shown in figure 1, the high-speed train brake disc material with stable friction coefficient comprises the following raw materials in percentage by mass:
a preparation method of a high-speed train brake disc material with a stable friction coefficient comprises the following steps:
s1, proportioning brake disc elements according to the component requirements, adding the brake disc elements into an electric furnace, heating to 1580 ℃, and fully melting the brake disc elements to obtain molten steel;
s2, adding a nucleating agent into the fully molten steel, and then casting into ingots;
s3, forging by adopting multidirectional die forging to obtain a forging blank;
and S4, performing three-stage performance heat treatment on the obtained forging blank through normalizing, quenching and tempering to obtain the high-stability train brake disc material.
Fe is dispersed and distributed in the crystal of the high-speed train brake disc material with the stable friction coefficient3Al superfine phase.
The nucleating agent is spherical shell structure nano Fe3Al@Al2O3。
The spherical shell structure is nano Fe3Al@Al2O3The preparation method comprises the following steps:
s201, proportioning Fe powder and Al powder with the particle size of 50nm according to the atomic ratio of 3:1, placing the mixture into a high-purity argon-protected vacuum high-energy ball mill, carrying out ball milling for 3 hours at 500rpm, and taking out the mixture in a vacuum glove box filled with argon protection after completely cooling to obtain mixed powder;
s202, placing the ball-milled mixed powder in a vacuum tube furnace at a temperature of 3 x 10-3Preserving heat for 1h under the conditions of MPa and 1350 ℃, and then cooling the furnace to room temperature;
s203, putting the mixed powder cooled in the furnace S202 into a hydrazine solution with the concentration of 0.8mol/L and the temperature of 38 ℃ for etching for 13h, and etchingFiltering, ultrasonically cleaning with alcohol, and drying to obtain spherical shell structure nano Fe3Al@Al2O3。
The spherical shell structure is nano Fe3Al@Al2O3Is made of Fe3Al is used as a core, and Al is generated outside the core in situ2O3Shell layer of Al2O3A plurality of pores are uniformly distributed on the shell layer.
In S3, the start forging temperature of the multidirectional die forging is 1050 ℃, the finish forging temperature is 900 ℃, and the forging ratio is more than 3.5: 1.
In S4, the three-stage performance heat treatment of normalizing, quenching and tempering is as follows: normalizing: heating to 900 ℃, preserving heat for 0.8h, and then cooling to room temperature; quenching: heating to 900 ℃ followed by oil cooling to room temperature; tempering: heating to 550 ℃ and keeping the temperature for 2h, and then furnace cooling to room temperature.
Said Fe3The grain size of the Al superfine phase is 5-10 μm.
Example 2:
a high-speed train brake disc material with a stable friction coefficient comprises the following raw materials in percentage by mass:
a preparation method of a high-speed train brake disc material with a stable friction coefficient comprises the following steps:
s1, proportioning brake disc elements according to the component requirements, adding the brake disc elements into an electric furnace, heating to 1690 ℃, and fully melting to obtain molten steel;
s2, adding a nucleating agent into the fully molten steel, and then casting into ingots;
s3, forging by adopting multidirectional die forging to obtain a forging blank;
and S4, performing three-stage performance heat treatment on the obtained forging blank through normalizing, quenching and tempering to obtain the high-stability train brake disc material.
Fe is dispersed and distributed in the crystal of the high-speed train brake disc material with the stable friction coefficient3Al superfine phase.
The nucleating agent is spherical shell structure nano Fe3Al@Al2O3。
The spherical shell structure is nano Fe3Al@Al2O3The preparation method comprises the following steps:
s201, proportioning Fe powder and Al powder with the particle size of 100nm according to the atomic ratio of 3:1, placing the mixture into a high-purity argon-protected vacuum high-energy ball mill, carrying out ball milling for 5 hours at 800rpm, and taking out the mixture in a vacuum glove box filled with argon protection after completely cooling to obtain mixed powder;
s202, placing the ball-milled mixed powder in a vacuum tube furnace at 1 x 10-3Preserving heat for 2.5 hours under the conditions of MPa and 1480 ℃, and then cooling to room temperature;
s203, putting the mixed powder cooled in the S202 furnace into a hydrazine solution with the concentration of 1.5mol/L and the temperature of 45 ℃ for etching for 25h, then filtering, ultrasonically cleaning with alcohol, and drying to obtain the nano Fe with the spherical shell structure3Al@Al2O3。
The spherical shell structure is nano Fe3Al@Al2O3Is made of Fe3Al is used as a core, and Al is generated outside the core in situ2O3Shell layer of Al2O3A plurality of pores are uniformly distributed on the shell layer.
In S3, the start forging temperature of the multidirectional die forging is 1050 ℃, the finish forging temperature is 900 ℃, and the forging ratio is more than 3.5: 1.
In S4, the three-stage performance heat treatment of normalizing, quenching and tempering is as follows: normalizing: heating to 900 ℃, preserving heat for 1h, and then air-cooling to room temperature; quenching: heating to 900 ℃ followed by oil cooling to room temperature; tempering: heating to 550 ℃ and keeping the temperature for 4h, and then furnace cooling to room temperature.
Said Fe3The grain size range of the Al superfine phase is 25-30 mu m.
Example 3:
this example differs from example 1 only in that:
a high-speed train brake disc material with a stable friction coefficient comprises the following raw materials in percentage by mass: c: 0.25 percent; si: 0.25 percent; mn: 0.83 percent; v: 0.30 percent; cr: 1.68 percent; ni: 1.96 percent; mo: 0.25 percent; cu: 0.50 percent; p: 0.008 percent; s: 0.006%; al: 3.50 percent; the balance being Fe.
A preparation method of a high-speed train brake disc material with a stable friction coefficient comprises the following steps of3The grain size of the Al superfine phase is 5-15 μm.
Example 4:
this example differs from example 1 only in that:
a high-speed train brake disc material with stable friction coefficient is characterized in that: the raw materials and the mixture ratio are as follows by mass percent: c: 0.30 percent; si: 0.24 percent; mn: 1.05 percent; v: 0.28 percent; cr: 2.15 percent; ni: 2.01 percent; mo: 0.23 percent; cu: 0.25 percent; p: 0.006%; s: 0.007%; al: 4.15 percent; the balance being Fe.
Example 5:
this example differs from example 1 only in that:
a high-speed train brake disc material with a stable friction coefficient comprises the following raw materials in percentage by mass: c: 0.33 percent; si: 0.30 percent; mn: 0.75 percent; v: 0.40 percent; cr: 1.07 percent; ni: 0.89 percent; mo: 0.17 percent; cu: 0.75 percent; p: 0.01 percent; s: 0.005 percent; al: 4.38 percent; the balance being Fe.
Through tests, the friction coefficient and the impact absorption work of the brake disc material of the high-speed train prepared by the invention are shown in the following table 1 and the following table 2.
TABLE 1 Friction coefficient of high-speed train brake disc samples at different temperatures
TABLE 2 impact absorption energy A of brake disc material samples of high-speed trains at different temperaturesKV
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A preparation method of a high-speed train brake disc material with a stable friction coefficient is characterized by comprising the following steps: the raw materials and the mixture ratio are as follows by mass percent:
the preparation method comprises the following steps:
s1, mixing the brake disc elements according to the component requirements, adding the brake disc elements into an electric furnace, heating to 1580-1690 ℃, and fully melting to obtain molten steel;
s2, adding a nucleating agent into the fully molten steel, and then casting into ingots;
s3, forging by adopting multidirectional die forging to obtain a forging blank;
s4, carrying out three-stage performance heat treatment on the obtained forging blank through normalizing, quenching and tempering to obtain the high-speed train brake disc material with stable friction coefficient;
the nucleating agent is spherical shell structure nano Fe3Al@Al2O3；
The spherical shell structure is nano Fe3Al@Al2O3Is made of Fe3Al is used as a core, and Al is generated outside the core in situ2O3Shell layer of Al2O3A plurality of pores are uniformly distributed on the shell layer;
in S4, the three-stage performance heat treatment of normalizing, quenching and tempering is as follows: normalizing: heating to 900 ℃, preserving heat for 0.8-1 h, and then air cooling to room temperature; quenching: heating to 900 ℃ followed by oil cooling to room temperature; tempering: heating to 550 ℃, preserving heat for 2-4 h, and then furnace cooling to room temperature.
2. The method for preparing a brake disc material for a high-speed train with a stable friction coefficient according to claim 1, wherein the method comprises the following steps: fe is dispersed and distributed in the crystal of the high-speed train brake disc material with the stable friction coefficient3Al superfine phase.
3. The method for preparing a brake disc material for a high-speed train with a stable friction coefficient according to claim 1, wherein the method comprises the following steps: the spherical shell structure is nano Fe3Al@Al2O3The preparation method comprises the following steps:
s201, proportioning Fe powder and Al powder with the particle size of 50-100 nm according to the atomic ratio of 3:1, placing the mixture into a high-purity argon protection vacuum high-energy ball mill, carrying out ball milling for 3-5 h at 500-800 rpm, cooling completely, and taking out the cooled mixture in a vacuum glove box filled with argon to obtain mixed powder;
s202, placing the mixed powder subjected to ball milling in a vacuum tube furnace at a temperature of 3 multiplied by 10-3~1×10-3Preserving heat for 1-2.5 h under the conditions of MPa and 1350-1480 ℃, and then cooling to room temperature;
s203, putting the mixed powder cooled in the furnace S202 in a hydrazine solution with the concentration of 0.8-1.5 mol/L and the temperature of 38-45 ℃ for etching for 13-25 h, then filtering, ultrasonically cleaning with alcohol, and drying to obtain the spherical shell structure nano Fe3Al@Al2O3。
4. The method for preparing a brake disc material for a high-speed train with a stable friction coefficient according to claim 1, wherein the method comprises the following steps: in S3, the start forging temperature of the multidirectional die forging is 1050 ℃, the finish forging temperature is 900 ℃, and the forging ratio is more than 3.5: 1.
5. The method for preparing the brake disc material of the high-speed train with the stable friction times as claimed in claim 2, wherein the method comprises the following steps: said Fe3The grain size of the Al superfine phase is 5-30 μm.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6052561A (en) * | 1983-08-31 | 1985-03-25 | Sumitomo Metal Ind Ltd | Steel for disk brake rotor |
| JP2001003141A (en) * | 1999-06-22 | 2001-01-09 | Nippon Steel Corp | Martensitic stainless steel for disk brake |
| CN107090561A (en) * | 2017-04-01 | 2017-08-25 | 长兴微羽智能科技有限公司 | The alloy cast iron and its Technology for Heating Processing of a kind of brake disk |
| CN105671280B (en) * | 2016-01-27 | 2017-12-08 | 南京工程学院 | A kind of manufacture method of deep-sea production tree critical component steel forgings |
| CN107760838A (en) * | 2017-10-30 | 2018-03-06 | 马钢(集团)控股有限公司 | A kind of brake disc of high-speed train Heat-Treatment of Steel method |
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2020
- 2020-09-28 CN CN202011039860.8A patent/CN112159930B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6052561A (en) * | 1983-08-31 | 1985-03-25 | Sumitomo Metal Ind Ltd | Steel for disk brake rotor |
| JP2001003141A (en) * | 1999-06-22 | 2001-01-09 | Nippon Steel Corp | Martensitic stainless steel for disk brake |
| CN105671280B (en) * | 2016-01-27 | 2017-12-08 | 南京工程学院 | A kind of manufacture method of deep-sea production tree critical component steel forgings |
| CN107090561A (en) * | 2017-04-01 | 2017-08-25 | 长兴微羽智能科技有限公司 | The alloy cast iron and its Technology for Heating Processing of a kind of brake disk |
| CN107760838A (en) * | 2017-10-30 | 2018-03-06 | 马钢(集团)控股有限公司 | A kind of brake disc of high-speed train Heat-Treatment of Steel method |
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