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Iron-based alloy powder for laser cladding of TRT (Blast Furnace Top Pressure Recovery Turbine Unit) parts

An iron-based alloy and laser cladding technology, which is applied in the coating process and coating of metal materials, can solve the problems of unsuitable laser cladding of TRT unit parts, uncontrollable cracks, and difficult machining, etc., and achieve economic benefits Significant and social benefits, meet the effect of corrosion resistance, lower alloy melting point

Active Publication Date: 2012-02-15
河北瑞兆激光再制造技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to solve problems such as cracks, inclusions, pores, uneven composition, unstable performance and unguaranteed inability to control cracks, pores, segregation, unstable performance, difficult machining, and inhomogeneous composition in actual cladding. It is suitable for many defects such as laser cladding of TRT unit parts, and provides a method specially used for laser cladding to repair TRT unit parts. The operation of this remanufacturing technology, TRT unit parts with moderate hardness and stable performance Iron-based alloy powder for cladding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 5000W CO with stable cladding performance 2 The laser is used to cladding the failed main shaft (the material is medium carbon structural steel). The weight percentage of each element of iron-based alloy powder is:

[0028] C: 0.04%; Cr: 15.5%; Ni: 5.5%; Mo: 1.5%; Nb: 0.4%; N: 0.2%; Si: 1.0%; Ce: 0.2%;

[0029] The cladding process parameters are: power: 2500~3800W, focal length: 300~400mm, spot diameter: 3~6mm, scanning speed: 240~400mm / min, powder thickness: 0.5~0.8mm.

Embodiment 2

[0031] 5000W CO with stable performance 2 The laser is used to cladding the failed bearing cylinder (material is low carbon steel). The percentage by weight of each element of the designed iron-based alloy powder is:

[0032] C: 0.03%; Cr: 16.5%; Ni: 6.5%; Mo: 1.2%; Nb: 0.6%; N: 0.25%; Si: 1.2%; Ce: 0.2%;

[0033] The cladding process parameters are: power: 2500~3800W, focal length: 300~400mm, spot diameter: 3~6mm, scanning speed: 240~400mm / min, powder thickness: 0.5~1.0mm.

Embodiment 3

[0035] 5000W CO with stable cladding performance 2 Laser, for laser cladding on the failed moving blades. The mass percent of each element of the designed iron-based alloy powder is:

[0036] C: 0.05%; Cr: 15.5%; Ni: 6.5%; Mo: 1.0%; Nb: 0.5%; N: 0.3%; Si: 0.9%; Ce: 0.3%;

[0037] The cladding process parameters are: power: 2500~3500W, focal length: 300~360mm, spot diameter: 3~6mm, scanning speed: 300~400mm / min, powder thickness: 0.3~0.6mm.

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Abstract

The invention discloses iron-based alloy powder for the laser cladding of TRT (Blast Furnace Top Pressure Recovery Turbine Unit) parts. As for the powder, on the basis of an iron-nickel-chromium alloy, Mo, Nb, N and Si element strengthening matrixes are added, and the alloy melting point is reduced while the moderate hardness is kept, and the comprehensive properties such as high strength, abrasion resistance and the like are ensured, thus being convenient for laser cladding; and trace elements Ce and Hf are added to improve the crystal boundary quality, inhibit and prevent cracks, improve the heat stability and chemical stability of a cladding layer and endow the alloy with oxidation resistance, corrosion resistance and abrasion resistance under a higher temperature and wider application range. Failed parts made from carbon steel, structural steel, hardened and tempered steel, stainless steel, tool steel and other materials can be repaired by using the powder and combining the laser cladding technology, thus the powder has wide application prospects and obvious benefits.

Description

technical field [0001] The invention relates to a material for cladding, in particular to an iron-based alloy powder for laser cladding of TRT unit components mainly used in laser repair of TRT unit main shafts, rotors, bearing cylinders and other parts in the metallurgical industry. Background technique [0002] Blast furnace gas energy recovery turbine (TRT for short) is a world-recognized major energy recovery device for iron and steel enterprises, a green energy product that supports circular economy, and has become a recognized energy-saving and environmental protection device in the iron and steel industry. Due to factors such as materials, working conditions, and media, the main shaft, rotor, and bearing cylinder of the TRT unit often suffer from corrosion, wear, erosion, and even blade breakage during service, which seriously affects the working efficiency of the unit. [0003] For failed TRT spindles, rotors, bearing cylinders and other components, manufacturers can...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C38/48B22F1/00
Inventor 韩宏升陈常义
Owner 河北瑞兆激光再制造技术股份有限公司
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