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Wear-resisting material used for brake disc of high-speed train and preparation method for wear-resisting material

A technology of wear-resistant materials and high-speed trains, applied in the field of alloy steel materials, can solve the problems of obvious changes in friction coefficient with load and temperature, poor structure uniformity of as-cast brake disc materials, complicated preparation process, etc., to shorten the heat treatment cycle, Effect of improving tissue uniformity and reducing production cost

Inactive Publication Date: 2017-04-19
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a high-speed train brake disc for the existing forged steel brake discs with complex preparation process, high cost, poor structure uniformity of as-cast brake disc material, obvious change of friction coefficient with load and temperature, etc. Using wear-resistant materials, alloy steel based on specific components, using a heat treatment process that combines quenching and tempering, by changing the heat treatment holding temperature and holding time, the structure of the alloy steel is regulated

Method used

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  • Wear-resisting material used for brake disc of high-speed train and preparation method for wear-resisting material
  • Wear-resisting material used for brake disc of high-speed train and preparation method for wear-resisting material
  • Wear-resisting material used for brake disc of high-speed train and preparation method for wear-resisting material

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Experimental program
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Embodiment 1

[0028] Weigh the sample as described in Table 1 above, use a 50Kg medium frequency induction furnace to melt the molten steel, add ferro-titanium and pure niobium, adjust the chemical composition of the molten steel, and then pour it. The as-cast sample was obtained by sand casting, and the metallographic structure of the as-cast sample is shown in figure 1 . Specimens for wire cutting heat treatment. The as-cast sample was heated to 900°C for 2 hours, water quenched, then kept at 600°C for 2 hours, and air-cooled. The metallographic structure of the sample after heat treatment is shown in figure 2 .

[0029] See Table 2 for the volumetric wear rates of the as-cast and heat-treated samples in Example 1 above under the conditions of a load of 100 N and a sliding speed of 45 m / s.

[0030] Table 2 Volume wear rate of as-cast and heat-treated states

[0031]

Embodiment 2

[0033] Weigh the sample as described in Table 1 above, use a 50Kg intermediate frequency induction furnace to melt the molten steel, add ferrotitanium, and adjust the alloying elements of the molten steel for pouring. The as-cast samples were obtained by sand casting, and the samples for heat treatment were processed by wire cutting. The as-cast sample was heated to 950°C for 1.5 hours, water quenched, then kept at 550°C for 1.5 hours, and air-cooled.

[0034] Under the same conditions, the friction coefficient of alloy steel is maintained at 0.35~0.40, and the volume wear rate is 3.45mm 3 / m.

Embodiment 3

[0036] Weigh the samples as described in Table 1 above, use a 50Kg medium frequency induction furnace to melt the molten steel, add pure niobium, adjust the chemical composition of the molten steel, and then pour. The as-cast samples were obtained by sand casting, and the samples for heat treatment were processed by wire cutting. The as-cast sample was heated to 1000°C for 1 hour, water quenched, then kept at 650°C for 2.5 hours, and air-cooled.

[0037] Under the same conditions, the friction coefficient of alloy steel is maintained at 0.33~0.37, and the volume wear rate is 2.96mm 3 / m.

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Abstract

The invention relates to a wear-resisting material used for a brake disc of a high-speed train and a preparation method for the wear-resisting material. The wear-resisting material consists of the following raw material components in percentage by mass: 0.14-0.22% of C, 0.40-0.65% of Si, 0.80-1.20% of Mn, 2.40-2.90% of Ni, 2.30-3.00% of Cr, 0.90-1.30% of Mo, 0.40-0.80% of V, 0-0.30% of Nb, 0-0.30% of Ti, less than or equal to 0.015% of P, less than or equal to 0.010% of S and the balance of Fe. The invention further discloses the preparation method for the wear-resisting material, and the preparation method comprises the following steps: (A) designing chemical components of alloy steel; (B) adopting a medium-frequency electric furnace to smelt; and (C) carrying out thermal treatment on an as-cast sample. The thermal treatment process comprises the steps of preserving the heat for 1-2 hours at a temperature being 900-1000 DEG C, carrying out water quenching, preserving the heat for 1.5-2.5 hours at a temperature being 550-650 DEG C, and cooling in air. A thermally-treated structure is tempered sorbite which has hardness HRC being 42-45, a friction coefficient stabilized to 0.34-0.38, very good wear resistance, low production cost and good casting performance.

Description

technical field [0001] The invention relates to a wear-resistant material for high-speed train brake discs and a preparation method thereof, belonging to the technical field of alloy steel materials. Background technique [0002] Friction material is a key safety part in the clutch assembly and brake of vehicles and machinery. During the transmission and braking process, the following technical requirements should be mainly met: (1) suitable and stable friction coefficient, (2) good wear resistance (3) Good mechanical strength and physical properties, (4) Low braking noise, (5) Less wear on the opposite surface. With the increase of train running speed, the braking safety requirements of trains are getting higher and higher. [0003] The material performance of the brake disc body of high-speed train is one of the most critical technical issues in the brake device. When the train brakes at high speed, the ever-increasing braking load, the sharply reduced running speed and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C33/04
CPCC22C38/18C22C33/04C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14
Inventor 王红星胡谦王章忠朱帅帅王成秦超沈伽宁梁昊崔梦
Owner NANJING INST OF TECH
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