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Alloy steel powder for laser additive manufacturing of composite high-speed rail brake disc and manufacturing method

A laser additive and alloy steel powder technology, which is applied in the direction of additive manufacturing, additive processing, and energy efficiency improvement, can solve the problems of low service life of brake discs, achieve good wear resistance, good comprehensive performance, and Excellent toughness effect

Active Publication Date: 2021-06-18
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of low service life of existing brake discs, the present invention provides a laser additive manufacturing alloy steel powder for composite high-speed rail brake discs and a manufacturing method, using intelligent manufacturing to improve the hardness and wear resistance of the brake disc surface corrosion performance

Method used

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  • Alloy steel powder for laser additive manufacturing of composite high-speed rail brake disc and manufacturing method
  • Alloy steel powder for laser additive manufacturing of composite high-speed rail brake disc and manufacturing method
  • Alloy steel powder for laser additive manufacturing of composite high-speed rail brake disc and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The mass percentage of 24CrNiMo low alloy steel powder is C: 0.20%, Cr: 1.04%, Ni: 0.96%, Si: 0.50%, Mo: 0.45%, Mn: 1.02%, O: 0.018%, and the rest is Fe;

[0051] The mass percentage of corrosion-resistant stainless steel powder is C: 0.16%, Cr: 16.50%, Ni: 4.70%, Si: 1.15%, Mo: 0.91%, Mn: 0.50%, B: 1.14%, Ti: 1.50% , Re: 0.50%, the rest is Fe;

[0052] The particle size of the 24CrNiMo low-alloy steel powder and the corrosion-resistant stainless steel powder is 28-45 μm.

[0053] A method for manufacturing composite high-speed rail brake disc alloy steel using the above-mentioned laser additive manufacturing alloy steel powder for composite high-speed rail brake discs, the method steps are as follows:

[0054] 1) Substrate pretreatment, austenitic stainless steel is used as the substrate, and the surface of the substrate to be melted and deposited is treated with 100 # and 200 # SiC metallographic sandpaper is polished flat, with a parallelism of 0.01mm, and then sa...

Embodiment 2

[0069] The mass percentage of 24CrNiMo low alloy steel powder is C: 0.25%, Cr: 0.98%, Ni: 1.02%, Si: 0.37%, Mo: 0.54%, Mn: 0.90%, O: 0.018%, and the rest is Fe;

[0070] The mass percentage of corrosion-resistant stainless steel powder is C: 0.18%, Cr: 15.00%, Ni: 10.70%, Si: 1.04%, Mo: 1.50%, Mn: 0.45%, B: 1.25%, Ti: 0.50% , Re: 1.80%, the rest is Fe;

[0071] The particle size of the 24CrNiMo low-alloy steel powder and the corrosion-resistant stainless steel powder is 28-45 μm.

[0072] A method for manufacturing composite high-speed rail brake disc alloy steel using the above-mentioned laser additive manufacturing alloy steel powder for composite high-speed rail brake discs, the method steps are as follows:

[0073] 1) Substrate pretreatment, austenitic stainless steel is used as the substrate, and the surface of the substrate to be melted and deposited is treated with 100 # and 200 # SiC metallographic sandpaper is polished flat, with a parallelism of 0.009mm, and then ...

Embodiment 3

[0083] The mass percentage of 24CrNiMo low alloy steel powder is C: 0.22%, Cr: 1.00%, Ni: 1.00%, Si: 0.43%, Mo: 0.49%, Mn: 0.96%, O: 0.018%, and the rest is Fe;

[0084] The mass percentage of corrosion-resistant stainless steel powder is C: 0.17%, Cr: 15.80%, Ni: 6.70%, Si: 1.09%, Mo: 0.99%, Mn: 0.47%, B: 1.19%, Ti: 0.90% , Re: 0.90%, the rest is Fe;

[0085] The particle size of the 24CrNiMo low-alloy steel powder and the corrosion-resistant stainless steel powder is 28-45 μm.

[0086] A method for manufacturing composite high-speed rail brake disc alloy steel using the above-mentioned laser additive manufacturing alloy steel powder for composite high-speed rail brake discs, the method steps are as follows:

[0087] 1) Substrate pretreatment, austenitic stainless steel is used as the substrate, and the surface of the substrate to be melted and deposited is treated with 100 # and 200 # SiC metallographic sandpaper is polished flat, with a parallelism of 0.005mm, and then s...

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Abstract

The invention belongs to the technical field of laser additive manufacturing materials, and relates to alloy steel powder for laser additive manufacturing of a composite high-speed rail brake disc. The alloy steel powder comprises matrix powder and strengthened layer powder, the matrix powder is 24CrNiMo low alloy steel powder, and the strengthened layer powder is wear-resistant stainless steel powder. The method for manufacturing the composite high-speed rail brake disc alloy steel comprises the steps that (1) a base plate is pretreated, specifically, austenitic stainless steel is adopted as the base plate, and polishing, sand blasting, ultrasonic cleaning and drying are conducted for standby application; and (2) the two kinds of powder are dried, specifically, matrix deposition layer alloy powder and surface strengthening layer alloy powder are sequentially deposited on the surface of the austenitic stainless steel base plate by the aid of a double-powder-laying optical fiber laser machining system and a selective laser melting method. According to the alloy steel powder and the method, the composite alloy steel which is excellent in matrix obdurability, good in comprehensive performance, high in surface strengthening layer hardness and good in abrasion resistance can be successfully prepared on the austenitic stainless steel base plate.

Description

technical field [0001] The invention belongs to the technical field of laser additive manufacturing materials, and in particular relates to a manufacturing method of the powder used for manufacturing composite high-speed rail brake disc alloy steel and the alloy steel thereof by laser additive manufacturing. Background technique [0002] Braking technology is an important factor affecting the speed of trains, and the braking device or braking method of high-speed trains is one of the key issues to ensure the safe operation of trains. The brake disc is an essential part of all vehicle braking systems, and it is fixed on the axle and rotates with the wheel. When braking, the brake block is pressed onto the brake disc under the push of the caliper piston, and the wheel speed is reduced through the friction between the brake block and the brake disc to achieve the purpose of vehicle deceleration and braking. Usually train brake disc components are manufactured by integral casti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/50C22C38/54B22F10/28B22F12/50B33Y10/00B33Y30/00B33Y80/00
CPCC22C38/02C22C38/04C22C38/44C22C38/54C22C38/50C22C38/005B33Y10/00B33Y30/00B33Y80/00Y02P10/25
Inventor 张春华王旭崔雪张瀚方张松吴臣亮
Owner SHENYANG POLYTECHNIC UNIV
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