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Heat-resisting die steel material for 3D (Three-Dimensional) printing and preparation method of heat-resisting die steel material

A 3D printing and mold steel technology, applied in the field of heat-resistant mold steel materials for laser 3D printing and its preparation, can solve the problems of difficult to manufacture complex parts, difficult to process heat-resistant steel, etc. good fluidity

Active Publication Date: 2015-02-04
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a heat-resistant mold steel material for laser 3D printing and its preparation method. Difficult to process and difficult to manufacture complex parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029]Austenitic heat-resistant steel HR3C (25Cr-20Ni-Nb-N steel) is a new type of heat-resistant stainless steel with good high-temperature creep strength and high-temperature oxidation resistance, and can be used for key components in thermal power generating units. Because the material contains a large amount of Ni, it has strong oxidation resistance and good 3D printing formability. The preparation process of the powder material for 3D printing with the composition of 25Cr-20Ni-Nb-N is as follows:

[0030] (1) Referring to the traditional material composition, according to 0.16wt% C, 17-23wt% Cr, 17-23wt% Ni, 0.2-0.6wt% No, 0.15-0.35wt% N, 1.5wt% Si , 2wt% of Mn and no more than 0.01wt% of P and S for proportioning.

[0031] (2) Since the powder material will lose C element during the 3D printing process, 0.1wt% C is added as compensation, 0.5wt% Cr is used as a deoxidizing element, 0.05wt% Mn is used as an anti-crack element, and the raw materials are added to high vacuu...

example 2

[0035] The service temperature of 3Cr24Ni7Si2 stainless steel is 950-1050 ℃, which is an ideal material for liquid forging steel molds. However, this material cannot be processed by numerical control, and it can be prepared into powder materials. 3D printing technology can be used to form complex and precise liquid forging steel molds. The powder contains more Cr and C, and less Ni. In 3D printing, there are factors such as oxidation and vaporization of C and Cr, and element compensation is required. The preparation process of the heat-resistant steel powder material for 3D printing with a composition of 3Cr24Ni7Si2 is as follows:

[0036] (1) Purchase a commercial 3Cr24Ni7Si2 stainless steel pipe, cut it into small pieces, and add it to the crucible of the high-vacuum melting equipment.

[0037] (2) Add 0.15wt% of C and 0.1wt% of Cr elements for compensation, and add 0.5wt% of Mn as an anti-crack element, pump the smelting equipment to a high vacuum state, and pass in an iner...

example 3

[0041] 3Crl8Mnl2Si2N stainless steel has a maximum working temperature of about 1000°C, has good high temperature strength, and has good oxidation resistance and carburization resistance. It is mostly used in the manufacture of heating components of heating furnaces, hooks in boilers, etc. Form use. If it is prepared as a powder material, laser 3D printing technology can be used to manufacture precision heat-resistant components of a heating furnace. The preparation process of the heat-resistant steel powder material for 3D printing with a composition of 3Cr24Ni7Si2 is as follows:

[0042] (1) Purchase a commercial 3Crl8Mnl2Si2N stainless steel pipe strip, cut it into small pieces, and add it to the crucible of the high-vacuum melting equipment.

[0043] (2) Add 0.13wt% of C and 0.2wt% of Cr elements for compensation, and add 0.1wt% of Mn as an anti-crack element at the same time, evacuate the smelting equipment to a high vacuum state, and pass in an inert gas as a protective...

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Abstract

The invention discloses a heat-resisting die steel material for 3D (Three-Dimensional) printing and a preparation method of the heat-resisting die steel material. The material takes a material component of a needed heat-resisting die as a basic component; C element, a deoxidization element and an anti-crack element are added, wherein the adding amounts of the three elements are of 0.1wt%-0.15wt%, 0.1wt%-0.5wt% and 0.05wt%-0.5wt% and the three elements are used for making up the loss of the C element in a 3D printing process, the oxidization in the 3D printing process is reduced and the anti-crack performance of tissues is improved; the material is of a 15-100-micron regular spherical shape. The method comprises the following steps: firstly, preparing spherical metal powder by an element compensation atomization method; carrying out a graded sieving and constant proportion mixing method to obtain the needed powder material. The prepared powder has high purity, fine powder granularity, high sphericity degree and good mobility; the density of a part is favorably improved and the powder is very suitable for laser 3D printing rapid molding; the difficulties that austenite heat-resisting steel is difficult to machine and the complicated part is difficult to manufacture are overcome, and the application of the material difficult to machine in the fields of heat energy, power, high-end heat-resisting hydraulic molds and the like is enlarged.

Description

technical field [0001] The invention belongs to the field of special materials for laser 3D printing, and in particular relates to a heat-resistant mold steel material for laser 3D printing and a preparation method thereof. According to the characteristics of element changes in the laser 3D printing process, the invention adjusts the components of austenitic heat-resistant steel that are difficult to process by traditional methods, and makes it into fine powder, so that it has good forming performance and uniform solidification morphology during laser 3D printing. , the spheroidization phenomenon is suppressed. Applying it to laser 3D printing to manufacture heat-resistant molds expands the application of laser 3D printing in high-end mold manufacturing. Background technique [0002] 3D printing manufacturing technology is an advanced manufacturing technology that integrates CAD / CAM technology, laser technology, numerical control technology, new materials and computer techn...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/08C22C38/00
Inventor 魏青松赵晓罗喜旺杜若舟张昂
Owner HUAZHONG UNIV OF SCI & TECH
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