High-toughness, heat-resistant and cold-fatigue-resistant high-speed train brake disc cast steel and preparation method thereof

A technology for high-speed trains and cast steel, applied in heat treatment equipment, casting molding equipment, casting molds, etc., can solve the problems of room temperature strength and toughness, high temperature strength and thermal fatigue resistance matching, etc., to reduce casting defects and suppress thermal fatigue. Effects of crack initiation and propagation, high thermal stability

Active Publication Date: 2021-05-07
BEIJING NAT INNOVATION INST OF LIGHTWEIGHT LTD +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned analysis, the purpose of the present invention is to provide a high-toughness anti-cold and heat fatigue high-speed train brake disc cast steel and its preparation method, which solves the problem of high-speed train cast steel brake disc materials in the prior art. The problem of matching strength and cold and heat fatigue resistance

Method used

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  • High-toughness, heat-resistant and cold-fatigue-resistant high-speed train brake disc cast steel and preparation method thereof
  • High-toughness, heat-resistant and cold-fatigue-resistant high-speed train brake disc cast steel and preparation method thereof
  • High-toughness, heat-resistant and cold-fatigue-resistant high-speed train brake disc cast steel and preparation method thereof

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preparation example Construction

[0038] On the other hand, the present invention provides a method for preparing cast steel for high-toughness and cold-heat fatigue-resistant high-speed train brake discs, comprising the following steps:

[0039] Step 1: Manufacture resin sand mold;

[0040] Use quartz sand, resin, and curing agent to make resin sand molds, and use three-dimensional geometric entities or 3D printing equipment to prepare resin sand mold components. The part of the sand mold components that contacts molten steel is painted with zircon powder coating for 1-10 times. After the sand mold components are naturally dried and solidified, they are preheated at 100-800°C for 1-8 hours to remove moisture, remove solid particles in the sand mold cavity, and assemble the mold to obtain a resin sand mold for molten steel pouring.

[0041] The particle size of quartz sand is 10-200 mesh, and SiO in quartz sand 2 The mass percentage of the content is greater than 90%, the added amount of the resin is 0.5%-25....

Embodiment 1

[0064] The present invention provides a high-toughness and cold-heat-fatigue-resistant high-speed train brake disc cast steel, and its chemical composition mass percentage is shown in Table 1.

[0065] The invention provides a method for preparing cast steel for brake discs of high-toughness and cold-heat fatigue-resistant high-speed trains, which comprises the following steps:

[0066] Step 1: Make resin sand mold;

[0067] Use quartz sand, phenolic resin, and curing agent to make resin sand molds. The particle size of the quartz sand is 50-80 mesh, and the quartz sand is SiO 2 The mass percentage of the content is greater than 95%, the added amount of the phenolic resin is 2.0% of the total mass of the sand mold, and the added amount of the curing agent is 30% of the added resin mass. After the sand mold is fully dried and solidified naturally, the water is fully removed after preheating at 600°C for 4 hours, and the solid particles in the cavity are sucked out by negative ...

Embodiment 2

[0083] A high-toughness anti-cold and heat fatigue-resistant high-speed train brake disc cast steel and its preparation method are carried out according to the method in Example 1, the difference is that:

[0084] 1. A kind of high-toughness anti-cold and heat fatigue high-speed train brake disc cast steel, its chemical composition mass percentage is as shown in table 4.

[0085] 2. The pouring method is adopted for pouring, the pouring temperature is 1580°C, the pouring time is 40s, and the gate of the sprue is covered with a ceramic filter to filter coarse inclusions in the molten steel.

[0086] 3. After pouring, the casting is protected by an argon atmosphere and left to cool for 30 minutes, during which the casting is accelerated by adding a chilled iron mold. Then, the casting is exposed to air and cooled to 500°C, the casting is taken out of the box, and the riser is cut and then air-cooled to room temperature.

[0087] 4. After the casting is cooled to room temperatur...

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Abstract

The invention relates to a cast steel for high-speed train brake discs with high toughness and anti-cold and heat fatigue and a preparation method thereof, which belongs to the field of metal materials and their preparation, and solves the problem of room temperature strength, toughness and high temperature of cast steel for high-speed train brake discs in the prior art. Matching of mechanical properties and thermal fatigue resistance failure performance. A high-toughness and heat-resistant fatigue-resistant cast steel for high-speed train brake discs, the chemical composition of which is: C: 0.20%-0.40%, Si: 0.30%-0.70%, Mn: 0.50%-2.00%, Cr : 0.50%‑2.00%, Ni: 0.50%‑2.00%, Mo: 0.40%‑1.80%, V: 0.01%‑0.30%, P≤0.015%, S≤0.010%, O≤0.010%, N≤0.015% , the rest are Fe and unavoidable impurities; the total content of Mn+Cr+Ni is 2.00%-6.00%, and the total content of Mo+V is 0.41%-2.00%. Through reasonable composition, organizational structure and preparation process control, the combination of excellent room temperature strength and toughness, high temperature mechanical properties and cold and heat fatigue resistance failure performance of cast steel is realized, which meets the comprehensive mechanical properties and long service life requirements of high-speed train cast steel brake discs , suitable for high-speed train cast steel brake disc materials.

Description

technical field [0001] The invention belongs to the field of metal materials and their preparation, and in particular relates to cast steel for brake discs of high-toughness and cold-heat fatigue-resistant high-speed trains and a preparation method thereof. Background technique [0002] As one of the core technologies of high-speed trains, high-speed train braking technology is related to the safety, stability and comfort of train operation. The main safety measure of high-speed trains is to rely on disc brakes as the final safety guarantee in case of failure. Brake discs are the core key components in the basic braking system of high-speed trains. During the braking process of high-speed trains, the friction between the brake disc and the brake pads causes the kinetic energy to be directly converted into heat energy. The increase in the maximum speed of the train leads to an increase in kinetic energy and heat generated during braking. Huge thermal load, thermal shock and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/02B22C9/08B22C9/22C21D1/18C21D1/28C21D6/00C21D9/00C22C33/06C22C38/02C22C38/04C22C38/44C22C38/46C22C38/58F16D69/02
CPCB22C9/02B22C9/086B22C9/22C21D1/18C21D1/28C21D6/004C21D6/005C21D6/008C21D9/0068C21D2211/008C22C33/06C22C38/001C22C38/002C22C38/02C22C38/04C22C38/44C22C38/46C22C38/58F16D69/027F16D2200/0021F16D2250/0007
Inventor 汤忖江陈蕴博宋佳健王金南左玲立臧玉郡祁晔思
Owner BEIJING NAT INNOVATION INST OF LIGHTWEIGHT LTD
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