Laser forming method of Cr3C2-NiCr composite material component

A laser forming and laser head technology, applied in additive processing, process efficiency improvement, additive manufacturing, etc., can solve the problem of uneven distribution of reinforcement phase, change the design composition of reinforcement phase, and large difference in packing density of metal powder and graphite powder and other problems to achieve the effect of eliminating uneven distribution

Inactive Publication Date: 2016-04-06
HUBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bulk density difference between metal powder and graphite powder is large. During the laser forming process, it is easy to cause stratification due to the large difference in powder density, which will cause uneven distribution of the reinforcement phase in the formed part, and will change the design of the reinforcement phase. Composition, significantly reduced Cr 3 C 2 - Properties of NiCr composite parts

Method used

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  • Laser forming method of Cr3C2-NiCr composite material component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment one, a kind of Cr 3 C 2 -NiCr composite material high-temperature roll laser forming method, including the following processes:

[0021] (1) Raw material formula and pretreatment

[0022] The raw material formula is: graphite 3.31wt.%, Cr30.25wt.%, Mo3.85%, rare earth oxide 0.38wt.%, Ni balance. The raw materials are in the form of powder, and the particle size of metal Ni, Cr, Mo powder and graphite powder is 50-200 microns; Cr powder and rare earth oxide are ball milled and mixed for 1 hour.

[0023] (2) Powder feeding and mixing

[0024] The multi-hopper screw powder feeding mixing system is used for powder feeding and instant mixing. The mixed powder of Cr and rare earth oxides is put into the first hopper, Ni powder is placed in the second hopper, and Mo powder is placed in the third hopper. Graphite powder is placed in the fourth hopper; 4 powder feeders feed powder at the same time, and the Cr is adjusted by the screw speed 3 C 2 Content in the p...

Embodiment 2

[0029] A Cr3C2-NiCr composite material heating furnace slip roller laser forming method, comprising the following processes:

[0030] (1) Raw material formula and pretreatment

[0031] Graphite 4.80wt.%, Cr38.53wt.%, Mo1.56%, rare earth oxide 0.41wt.%, Ni balance. The raw materials are in the form of powder, and the particle size of the metal Ni, Cr, and Mo powders is 60 microns; the Cr powder and the rare earth oxide are ball-milled and mixed for 1.5 hours.

[0032] (2) Powder feeding and mixing

[0033] The multi-hopper screw powder feeding mixing system is used for powder feeding and instant mixing. The mixed powder of Cr and rare earth oxides is put into the first hopper, Ni powder is placed in the second hopper, and Mo powder is placed in the third hopper. Graphite powder is placed in the fourth hopper; 4 powder feeders feed powder at the same time, and the Cr is adjusted by the screw speed 3 C 2 Content in local components.

[0034] (3) Laser forming

[0035]The la...

Embodiment 3

[0038] a Cr 3 C 2 -NiCr composite material high temperature shaft sleeve laser forming method, including the following process:

[0039] (1) Raw material formula and pretreatment

[0040] The raw material formula is: graphite 3.28wt.%, Cr38.39wt.%, Mo3.70%, rare earth oxide 0.71wt.%, Ni balance. The raw materials are in the form of powder, and the particle size of the metal Ni, Cr, and Mo powders is 60 microns; the Cr powder and the rare earth oxide are ball-milled and mixed for 2 hours.

[0041] (2) Powder feeding and mixing

[0042] The multi-hopper screw powder feeding mixing system is used for powder feeding and instant mixing. The mixed powder of Cr and rare earth oxides is put into the first hopper, Ni powder is placed in the second hopper, and Mo powder is placed in the third hopper. Graphite powder is placed in the fourth hopper; 4 powder feeders feed powder at the same time, and the Cr is adjusted by the screw speed 3 C 2 The content of the component is generate...

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Abstract

The invention relates to a laser forming method of a Cr3C2-NiCr composite material component. Selected raw material powder comprises, by weight percent, 3.28% to 4.80% of graphite, 30.25% to 38.53% of Cr, 1.56% to 3.85% of Mo, 0.38% to 0.71% of rare earth oxide and the balance Ni. The laser forming powder is conveyed quantitatively through a multi-hopper conveying system, four powder feeding devices of the multi-hopper conveying system are all connected with one common laser head through powder feeding pipes; a four-pipe coaxial laser head is adopted in laser forming, and through control over the powder conveying system and the laser head, the inner and outer gradient layered structure of the Cr3C2-NiCr component can be achieved, and the breaking toughness of the Cr3C2-NiCr component can reach more than 70% of a Ni-based alloy.

Description

technical field [0001] The invention belongs to the field of laser forming and relates to a Cr 3 C 2 -Laser forming method for NiCr composite components. Background technique [0002] The carbide types of Cr mainly include M 3 C 2 , M 3 C,M 7 C 3 and M 23 C 6 And other types, the better thermodynamic stability is Cr 3 C 2 、Cr 7 C 3 and Cr 23 C 6 , Cr 3 C 2 and Cr 7 C 3 It is often used as the reinforcing phase of metal matrix composites (MMC). where Cr 3 C 2 It can still maintain a relatively high hardness under high temperature conditions, and also has strong corrosion resistance and wear resistance. [0003] Cr 3 C 2 -NiCr starts to oxidize significantly in the air only above 1000°C. Its typical application products mainly include coal-fired boiler furnace tubes, metallurgical annealing furnace rolls, thermoforming molds, hydraulic press valves, hot rolls, water turbine nozzles, and turbine exhausts. Gas support, compressor crankshaft, diesel engine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105C22C19/05B22F1/00
CPCB22F1/0003C22C19/053B22F10/00B22F12/52B22F10/366B22F12/41B22F10/36B22F12/58B22F12/55B22F10/322Y02P10/25
Inventor 娄德元朱思雄廖加劲汪于涛翟中生P·贝内特刘顿
Owner HUBEI UNIV OF TECH
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