CN114318156A - Wear-resistant material for brake disc of high-speed rail and preparation method thereof - Google Patents
Wear-resistant material for brake disc of high-speed rail and preparation method thereof Download PDFInfo
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- CN114318156A CN114318156A CN202210012832.XA CN202210012832A CN114318156A CN 114318156 A CN114318156 A CN 114318156A CN 202210012832 A CN202210012832 A CN 202210012832A CN 114318156 A CN114318156 A CN 114318156A
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Abstract
The invention relates to a wear-resistant material for a brake disc of a high-speed rail, which comprises matrix powder, middle strengthening layer powder and surface wear-resistant layer powder; the powder of the matrix is 24CrNiMo alloy steel powder, the powder of the middle strengthening layer is abrasion-resistant stainless steel powder, and the powder of the surface abrasion-resistant layer is obtained by mixing Ni, Co, Cr alloy powder and strengthening ceramic powder. The wear-resistant material for the brake disc of the high-speed rail and the preparation method thereof solve the problems of more defects, low yield and short service life of the brake disc manufactured by the traditional process, and the preparation of the composite alloy steel is carried out by adopting the laser melting technology, so that the strength of a matrix is ensured and the wear resistance of the surface material of the brake disc of the high-speed rail is obviously improved while the advantages of the brake disc manufactured by the traditional method are kept.
Description
Technical Field
The invention relates to the technical field of brake devices for high-speed rails, in particular to a wear-resistant material for brake discs of high-speed rails and a preparation method thereof.
Background
The braking technology is an important factor influencing the speed increase of the train, and a braking device or a braking mode of the high-speed train is one of key problems for ensuring the safe operation of the train. The brake disc is an essential part of all vehicle brake systems and is fixed on an axle to rotate together with a wheel. When braking, the brake block is pushed to the brake disc under the push of the jaw piston, and the rotating speed of the wheel is reduced through the friction force between the brake block and the brake disc, so that the aim of decelerating and braking the vehicle is fulfilled. Generally, train brake disc components are manufactured by adopting an integral casting method, but the integral casting production process is multiple, the technological process is difficult to control, the casting is easy to generate defects of air holes, shrinkage porosity, shrinkage cavities and the like, the yield is less than 30%, and the service life of the brake disc is greatly shortened.
Therefore, the wear-resistant material for the brake disc of the high-speed rail and the preparation method thereof are designed to solve the problems.
Disclosure of Invention
The invention provides a wear-resistant material for a brake disc of a high-speed rail and a preparation method thereof to overcome the defects.
A wear-resistant material for a brake disc of a high-speed rail comprises matrix powder, middle strengthening layer powder and surface wear-resistant layer powder;
the powder of the matrix is 24CrNiMo alloy steel powder, the powder of the middle strengthening layer is abrasion-resistant stainless steel powder, and the powder of the surface abrasion-resistant layer is obtained by mixing Ni, Co, Cr alloy powder and strengthening ceramic powder;
the 24CrNiMo alloy steel powder comprises the following components in percentage by mass: 0.20-0.25%, Cr: 0.98-1.04%, Ni: 0.96-1.02%, Si: 0.37 to 0.50%, Mo: 0.45-0.54%, Mn: 0.90-1.02%, O: 0.018%, the balance being Fe;
the abrasion-resistant stainless steel powder comprises the following components in percentage by mass: 0.16-0.18%, Cr: 15.00-16.50%, Ni: 4.70-10.70%, Si: 1.04-1.15%, Mo: 0.91 to 1.50%, Mn: 0.45-0.50%, B: 1.14 to 1.25%, Ti: 0.50 to 1.50%, Re: 0.50-1.80% and the balance Fe;
the Ni, Co and Cr alloy powder accounts for 50-80% of the mass proportion of the surface wear-resistant layer powder, and the reinforced ceramic powder accounts for 20-50% of the mass proportion of the surface wear-resistant layer powder;
the mass ratio of Ni, Co and Cr in the Ni, Co and Cr alloy powder is as follows: ni: co: cr is 1: 1: 1;
the reinforced ceramic powder is prepared by mixing the following raw materials in percentage by mass:
WC powder: 80-95% of TiC powder: 3-10% of ZrC powder: 2-10%;
preferably, the powder granularity of Ni, Co and Cr in the Ni, Co and Cr alloy powder is 50-70 μm, the granularity of WC powder is 40-45 μm, the granularity of TiC powder is 15-20 μm, and the granularity of ZrC powder is 15-20 μm.
Preferably, the reinforced ceramic powder is prepared by mixing the following raw materials in percentage by mass: WC powder: 90% and TiC powder: 5%, ZrC powder: 5 percent.
A method for manufacturing high-speed rail brake disc alloy steel by using the wear-resistant material comprises the following steps:
the method comprises the following steps: preprocessing a substrate, namely, adopting austenitic stainless steel as the substrate, polishing and flattening the melting deposition processing surface of the substrate, then sand blasting, cleaning and drying for later use;
step two: respectively weighing two metal powder materials of 24CrNiMo alloy steel and abrasion-resistant stainless steel, and sequentially depositing a matrix deposition layer and a middle strengthening layer alloy powder material on the surface of an austenitic stainless steel substrate by adopting a double powder-spreading optical fiber laser processing system and a selective laser melting method to obtain a prefabricated part;
step three: and (3) placing the prefabricated part on a workbench of laser cladding equipment, uniformly spreading the dried powder of the surface wear-resistant layer on the prefabricated part, operating the laser cladding equipment, scanning the spread powder of the surface wear-resistant layer according to a laser scanning path programmed by a program, introducing protective gas for atmosphere protection, and completely melting and solidifying the powder layer to form the fully metallurgically bonded alloy steel.
Preferably, the powder spreading thickness in the third step is 16-18 mm.
The invention has the beneficial effects that:
the wear-resistant material for the brake disc of the high-speed rail and the preparation method thereof solve the problems of more defects, low yield and short service life of the brake disc manufactured by the traditional process, and the preparation of the composite alloy steel is carried out by adopting the laser melting technology, so that the strength of a matrix is ensured and the wear resistance of the surface material of the brake disc of the high-speed rail is obviously improved while the advantages of the brake disc manufactured by the traditional method are kept.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. It is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the respective manufacturers.
When numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any value therebetween can be selected unless the invention otherwise indicated. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs and the description of the present invention, and any methods, apparatuses, and materials similar or equivalent to those described in the examples of the present invention may be used to practice the present invention.
The first embodiment is as follows:
a wear-resistant material for a brake disc of a high-speed rail comprises matrix powder, middle strengthening layer powder and surface wear-resistant layer powder;
the powder of the matrix is 24CrNiMo alloy steel powder, the powder of the middle strengthening layer is abrasion-resistant stainless steel powder, and the powder of the surface abrasion-resistant layer is obtained by mixing Ni, Co, Cr alloy powder and strengthening ceramic powder;
the 24CrNiMo alloy steel powder comprises the following components in percentage by mass: 0.20%, Cr: 0.98%, Ni: 0.96%, Si: 0.37%, Mo: 0.45%, Mn: 0.90%, O: 0.018%, the balance being Fe;
the abrasion-resistant stainless steel powder comprises the following components in percentage by mass: 0.16%, Cr: 15.00%, Ni: 4.70%, Si: 1.04%, Mo: 0.91%, Mn: 0.45%, B: 1.14%, Ti: 0.50%, Re: 0.50 percent, and the balance of Fe;
the Ni, Co and Cr alloy powder accounts for 80% of the mass proportion of the surface wear-resistant layer powder, and the reinforced ceramic powder accounts for 20% of the mass proportion of the surface wear-resistant layer powder;
the mass ratio of Ni, Co and Cr in the Ni, Co and Cr alloy powder is as follows: ni: co: cr is 1: 1: 1;
the reinforced ceramic powder is prepared by mixing the following raw materials in percentage by mass:
WC powder: 90% and TiC powder: 5%, ZrC powder: 5 percent;
the powder granularity of Ni, Co and Cr in the Ni, Co and Cr alloy powder is 60 mu m, the granularity of WC is 45 mu m, the granularity of TiC is 20 mu m, and the granularity of ZrC is 20 mu m.
A method for manufacturing high-speed rail brake disc alloy steel by using the wear-resistant material comprises the following steps:
the method comprises the following steps: preprocessing a substrate, namely, adopting austenitic stainless steel as the substrate, polishing and flattening the melting deposition processing surface of the substrate, then sand blasting, cleaning and drying for later use;
step two: respectively weighing two metal powder materials of 24CrNiMo alloy steel and abrasion-resistant stainless steel, and sequentially depositing a matrix deposition layer and a middle strengthening layer alloy powder material on the surface of an austenitic stainless steel substrate by adopting a double powder-spreading optical fiber laser processing system and a selective laser melting method to obtain a prefabricated part;
step three: and (3) placing the prefabricated part on a workbench of laser cladding equipment, uniformly spreading the dried powder of the surface wear-resistant layer on the prefabricated part, wherein the powder spreading thickness is 16mm, operating the laser cladding equipment, scanning the spread powder of the surface wear-resistant layer according to a laser scanning path programmed by a program, simultaneously introducing protective gas for atmosphere protection, and completely melting and solidifying the powder layer to form the fully metallurgically combined alloy steel.
Tests show that the alloy steel prepared by the embodiment forms an obvious boundary among the matrix powder, the middle strengthening layer powder and the surface wear layer powder, has no obvious crack and no fusion defect, and is in a good metallurgical bonding state.
Example two:
a wear-resistant material for a brake disc of a high-speed rail comprises matrix powder, middle strengthening layer powder and surface wear-resistant layer powder;
the powder of the matrix is 24CrNiMo alloy steel powder, the powder of the middle strengthening layer is abrasion-resistant stainless steel powder, and the powder of the surface abrasion-resistant layer is obtained by mixing Ni, Co, Cr alloy powder and strengthening ceramic powder;
the 24CrNiMo alloy steel powder comprises the following components in percentage by mass: 0.25%, Cr: 1.04%, Ni: 1.02%, Si: 0.50%, Mo: 0.54%, Mn: 1.02%, O: 0.018%, the balance being Fe;
the abrasion-resistant stainless steel powder comprises the following components in percentage by mass: 0.18%, Cr: 16.50%, Ni: 10.70%, Si: 1.15%, Mo: 1.50%, Mn: 0.50%, B: 1.25%, Ti: 1.50%, Re: 1.80 percent and the balance of Fe;
the Ni, Co and Cr alloy powder accounts for 50-80% of the mass proportion of the surface wear-resistant layer powder, and the reinforced ceramic powder accounts for 20-50% of the mass proportion of the surface wear-resistant layer powder;
the mass ratio of Ni, Co and Cr in the Ni, Co and Cr alloy powder is as follows: ni: co: cr is 1: 1: 1;
the reinforced ceramic powder is prepared by mixing the following raw materials in percentage by mass:
WC powder: 90% and TiC powder: 5%, ZrC powder: 5 percent;
preferably, the Ni powder, the Co powder and the Cr powder in the Ni alloy powder, the Co alloy powder and the Cr alloy powder have the particle sizes of 60 mu m, the WC powder particle size is 45 mu m, the TiC powder particle size is 20 mu m, and the ZrC powder particle size is 20 mu m.
A method for manufacturing high-speed rail brake disc alloy steel by using the wear-resistant material comprises the following steps:
the method comprises the following steps: preprocessing a substrate, namely, adopting austenitic stainless steel as the substrate, polishing and flattening the melting deposition processing surface of the substrate, then sand blasting, cleaning and drying for later use;
step two: respectively weighing two metal powder materials of 24CrNiMo alloy steel and abrasion-resistant stainless steel, and sequentially depositing a matrix deposition layer and a middle strengthening layer alloy powder material on the surface of an austenitic stainless steel substrate by adopting a double powder-spreading optical fiber laser processing system and a selective laser melting method to obtain a prefabricated part;
step three: and (3) placing the prefabricated part on a workbench of laser cladding equipment, uniformly spreading the dried powder of the surface wear-resistant layer on the prefabricated part, wherein the powder spreading thickness is 18mm, operating the laser cladding equipment, scanning the spread powder of the surface wear-resistant layer according to a laser scanning path programmed by a program, simultaneously introducing protective gas for atmosphere protection, and completely melting and solidifying the powder layer to form the fully metallurgically combined alloy steel.
Tests show that the alloy steel prepared by the embodiment forms an obvious boundary among the matrix powder, the middle strengthening layer powder and the surface wear layer powder, has no obvious crack and no fusion defect, and is in a good metallurgical bonding state.
In conclusion, the wear-resistant material for the brake disc of the high-speed rail and the preparation method thereof solve the problems of more defects, low yield and short service life of the brake disc manufactured by the traditional process, and the preparation of the composite alloy steel is carried out by adopting the laser melting technology, so that the strength of a matrix is ensured and the wear resistance of the surface material of the brake disc of the high-speed rail is obviously improved while the advantages of the brake disc manufactured by the traditional method are kept.
The foregoing embodiments are merely illustrative of the principles of this invention and its efficacy, rather than limiting it, and various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (5)
1. The wear-resistant material for the brake disc of the high-speed rail comprises matrix powder, middle strengthening layer powder and surface wear-resistant layer powder, and is characterized in that the matrix powder is 24CrNiMo alloy steel powder, the powder used in the middle strengthening layer is abrasion-resistant stainless steel powder, and the surface wear-resistant layer powder is obtained by mixing Ni, Co, Cr alloy powder and strengthening ceramic powder;
the 24CrNiMo alloy steel powder comprises the following components in percentage by mass: 0.20-0.25%, Cr: 0.98-1.04%, Ni: 0.96-1.02%, Si: 0.37 to 0.50%, Mo: 0.45-0.54%, Mn: 0.90-1.02%, O: 0.018%, the balance being Fe;
the abrasion-resistant stainless steel powder comprises the following components in percentage by mass: 0.16-0.18%, Cr: 15.00-16.50%, Ni: 4.70-10.70%, Si: 1.04-1.15%, Mo: 0.91 to 1.50%, Mn: 0.45-0.50%, B: 1.14 to 1.25%, Ti: 0.50 to 1.50%, Re: 0.50-1.80% and the balance Fe;
the Ni, Co and Cr alloy powder accounts for 50-80% of the mass proportion of the surface wear-resistant layer powder, and the reinforced ceramic powder accounts for 20-50% of the mass proportion of the surface wear-resistant layer powder;
the mass ratio of Ni, Co and Cr in the Ni, Co and Cr alloy powder is as follows: ni: co: cr is 1: 1: 1;
the reinforced ceramic powder is prepared by mixing the following raw materials in percentage by mass:
WC powder: 80-95% of TiC powder: 3-10% of ZrC powder: 2-10%.
2. The wear-resistant material for brake disks of high-speed trains as claimed in claim 1, wherein the Ni, Co and Cr alloy powders have a powder particle size of 50 to 70 μm, the WC powder particle size is 40 to 45 μm, the TiC powder particle size is 15 to 20 μm, and the ZrC powder particle size is 15 to 20 μm.
3. The wear-resistant material for the brake disc of the high-speed rail according to claim 2, wherein the reinforced ceramic powder is prepared by mixing the following raw materials in percentage by mass: WC powder: 90% and TiC powder: 5%, ZrC powder: 5 percent.
4. A method for manufacturing a brake disc alloy steel for a high-speed railway from a wear-resistant material for a brake disc according to any one of claims 1 to 3, comprising the steps of:
the method comprises the following steps: preprocessing a substrate, namely, adopting austenitic stainless steel as the substrate, polishing and flattening the melting deposition processing surface of the substrate, then sand blasting, cleaning and drying for later use;
step two: respectively weighing two metal powder materials of 24CrNiMo alloy steel and abrasion-resistant stainless steel, and sequentially depositing a matrix deposition layer and a middle strengthening layer alloy powder material on the surface of an austenitic stainless steel substrate by adopting a double powder-spreading optical fiber laser processing system and a selective laser melting method to obtain a prefabricated part;
step three: and (3) placing the prefabricated part on a workbench of laser cladding equipment, uniformly spreading the dried powder of the surface wear-resistant layer on the prefabricated part, operating the laser cladding equipment, scanning the spread powder of the surface wear-resistant layer according to a laser scanning path programmed by a program, introducing protective gas for atmosphere protection, and completely melting and solidifying the powder layer to form the fully metallurgically bonded alloy steel.
5. The friction material for the brake shoe of the high-speed rail as claimed in claim 4, wherein the powder spreading thickness in the third step is 16-18 mm.
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| CN202210012832.XA CN114318156A (en) | 2022-01-07 | 2022-01-07 | Wear-resistant material for brake disc of high-speed rail and preparation method thereof |
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| CN202210012832.XA CN114318156A (en) | 2022-01-07 | 2022-01-07 | Wear-resistant material for brake disc of high-speed rail and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008000763A (en) * | 2006-06-20 | 2008-01-10 | Komatsu Ltd | Method for forming hardfaced layer |
| WO2017081665A1 (en) * | 2015-11-12 | 2017-05-18 | Innerco Sp. Z O.O. | Powder composition for the manufacture of casting inserts, casting insert and method of obtaining local composite zones in castings |
| CN112981253A (en) * | 2021-02-09 | 2021-06-18 | 沈阳工业大学 | Alloy steel powder for manufacturing composite high-speed rail brake disc by laser additive manufacturing and manufacturing method |
| CN113122840A (en) * | 2021-04-25 | 2021-07-16 | 中国海洋大学 | Tough wear-resistant strengthening layer and preparation method thereof |
| CN113151823A (en) * | 2021-04-25 | 2021-07-23 | 中国海洋大学 | Super-thick gradient wear-resistant layer of brake disc of high-speed rail and preparation method of super-thick gradient wear-resistant layer |
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- 2022-01-07 CN CN202210012832.XA patent/CN114318156A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008000763A (en) * | 2006-06-20 | 2008-01-10 | Komatsu Ltd | Method for forming hardfaced layer |
| WO2017081665A1 (en) * | 2015-11-12 | 2017-05-18 | Innerco Sp. Z O.O. | Powder composition for the manufacture of casting inserts, casting insert and method of obtaining local composite zones in castings |
| CN112981253A (en) * | 2021-02-09 | 2021-06-18 | 沈阳工业大学 | Alloy steel powder for manufacturing composite high-speed rail brake disc by laser additive manufacturing and manufacturing method |
| CN113122840A (en) * | 2021-04-25 | 2021-07-16 | 中国海洋大学 | Tough wear-resistant strengthening layer and preparation method thereof |
| CN113151823A (en) * | 2021-04-25 | 2021-07-23 | 中国海洋大学 | Super-thick gradient wear-resistant layer of brake disc of high-speed rail and preparation method of super-thick gradient wear-resistant layer |
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Application publication date: 20220412 |