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Preparation method of FCC-BCC double-phase high-entropy alloy gradient material

A gradient material and high-entropy alloy technology, applied in the field of additive manufacturing, can solve the problems of high hardness, corrosion resistance and high temperature oxidation resistance, and achieve the effect of avoiding cracking, controllable phase composition, and hardness enhancement.

Pending Publication Date: 2021-02-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional strengthening method for treating the surface of H13 steel has been unable to meet the actual requirements of high hardness, corrosion resistance and high temperature oxidation resistance in production.

Method used

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  • Preparation method of FCC-BCC double-phase high-entropy alloy gradient material
  • Preparation method of FCC-BCC double-phase high-entropy alloy gradient material
  • Preparation method of FCC-BCC double-phase high-entropy alloy gradient material

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Experimental program
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Effect test

Embodiment 1

[0033] Step 1, raw material mixing, Fe, Co, Cr, Ni, Mn, Al spherical powder with a purity of 99.9%, the particle size of the spherical powder is in the range of 100 μm, Fe, Co, Cr, Ni, Mn, Al spherical powder respectively Mix uniformly according to the required molar ratio, dry the uniformly mixed spherical powder in a vacuum dryer, and seal and store after drying;

[0034] Step 2, the first layer of gradient material preparation, the substrate is made of H13 steel (4Cr5MoSiV) hot work die steel, the surface of the substrate is polished until there is no oxide, and the oil and dirt on the surface are cleaned with an organic solvent. The Fe, Co, Cr, Ni, Mn powders are configured according to the molar ratio of 1:1:1:1:1. The spherical powder obtained after the molar ratio is configured to pave the surface of the substrate, according to the process, the overlap rate is 50%, and the laser power is 1600W, scanning speed 7mm / s, spot diameter 3mm, nitrogen protective gas flow rate 2...

Embodiment 2

[0041] Step 1, mixing raw materials, Fe, Co, Cr, Ni, Mn, Al spherical powder with a purity of 99.9%, the particle size of the spherical powder is in the range of 50 μm, and Fe, Co, Cr, Ni, Mn, Al spherical powder according to A certain molar ratio is mixed evenly, and the uniformly mixed spherical powder is dried in a vacuum dryer, and sealed and stored after drying;

[0042]Step 2, the first layer of gradient material preparation, the substrate is made of 4Cr5MoSiV hot work die steel, the surface of the substrate is polished until there is no oxide, the oil and dirt on the surface are cleaned with an organic solvent, and the Fe, Co , Cr, Ni, Mn powder according to the ratio of 1:1:1:1:1 to obtain the spherical powder paved on the surface of the substrate. According to the process, the overlap rate is 50%, the laser power is 1500W, and the scanning speed is 6mm / s, spot diameter 2.5mm, nitrogen protective gas flow rate 1.5L / min, laser cladding is carried out parallel to the su...

Embodiment 3

[0049] Step 1, mixing raw materials, Fe, Co, Cr, Ni, Mn, Al spherical powder with a purity of 99.9%, the particle size of the spherical powder is in the range of 100 μm, and Fe, Co, Cr, Ni, Mn, Al spherical powder according to A certain molar ratio is mixed evenly, and the uniformly mixed spherical powder is dried in a vacuum dryer, and sealed and stored after drying;

[0050] Step 2, the first layer of gradient material preparation, the substrate is made of 4Cr5MoSiV hot work die steel, the surface of the substrate is polished until there is no oxide, the oil and dirt on the surface are cleaned with an organic solvent, and the Fe, Co , Cr, Ni, Mn powder according to the ratio of 1:1:1:1:1 to obtain the spherical powder paved on the surface of the substrate. According to the process, the overlap rate is 50%, the laser power is 1600W, and the scanning speed is 7mm / s, the diameter of the spot is 3mm, the flow rate of nitrogen protective gas is 2L / min, and the laser cladding is ...

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Abstract

The invention discloses a preparation method of an FCC-BCC double-phase high-entropy alloy gradient material. FeCoCrNiMn and FeCoCrNiMnAl0.5 high-entropy alloy cladding layers are firstly arranged ona hot work die steel material through laser cladding, then an FeCoCrNiMnAl high-entropy alloy cladding layer is arranged through laser cladding, laser cladding of the FeCoCrNiMnAl high-entropy alloy cladding layer can be effectively achieved, the dissimilar material connection interface of a substrate and the FeCoCrNiMnAl high-entropy alloy cladding layer has no contact area, cracks are reduced, the performance is improved, the cracking problem of the cladding layers is effectively avoided, and phase components of the FeCoCrNiMnAl high-entropy alloy cladding layer are controllable; and a transition layer capable of effectively relieving thermal stress can be formed, and meanwhile the hardness of an FeCoCrNiMnAl high-entropy alloy is greatly enhanced.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and more specifically relates to a preparation method of an FCC / BCC dual-phase high-entropy alloy gradient material. Background technique [0002] Hot work die steel has a wide range of uses and is the basis of process equipment in industrial production, because the parts with high productivity, high precision and low consumption produced by it are unmatched by other processing methods. As one of the most widely used die steels, hot work die steel needs to have the following technological properties: machinability, hardenability, wear resistance, thermal shock resistance, etc. [0003] In actual production, H13 hot work die steel needs to bear huge loads and combined effects of wear, erosion, thermal fatigue and stress corrosion, which often lead to H13 hot work die steel is extremely easy to damage during production, thereby increasing production costs . The traditional strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C30/00
CPCC23C24/106C22C30/00
Inventor 胡绳荪崔妍申俊琦耿可屏
Owner TIANJIN UNIV