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Martensite heat resisting cast steel defect repair welding powder and repair welding method

A technology of heat-resistant cast steel and martensite, applied in the field of laser processing, can solve the problem of high cost, achieve good protection, avoid poor hardness, and ensure relative uniformity

Inactive Publication Date: 2019-04-02
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the laser cladding alloy powder used for the defects of martensitic heat-resistant cast steel is mainly cobalt-based or nickel-based, but its cost is higher than that of iron-based raw materials, making it a major problem in raw material selection.

Method used

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  • Martensite heat resisting cast steel defect repair welding powder and repair welding method
  • Martensite heat resisting cast steel defect repair welding powder and repair welding method
  • Martensite heat resisting cast steel defect repair welding powder and repair welding method

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Experimental program
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Effect test

Embodiment 1

[0029] Laser cladding of martensitic heat-resistant steel. The chemical composition and mass percentage of each element of martensitic heat-resistant steel are: C: 0.12%; Si: 0.21%; Mn: 0.79%; Cr: 9.02%; Mo: 1.05%; Co: 0.96%; V: 0.20 %; Nb: 0.063%; N: 0.040%; B: 0.025%; Fe: balance. Laser cladding: the mass percentage composition of each powder is: C: 0.01%; Cr: 16.39%; Ni: 2.03%; Fe: 80.59%. Using single-pass cladding, the process parameters of the laser cladding are: laser power 2.5KW, spot diameter 5mm, scanning speed 250mm / min, defocus 30mm, protective gas: air. The powder feeding speed is 1.1g / min, and the powder feeding gas flow rate is 10L / min.

[0030] The macroscopic morphology of the laser cladding sample was observed, as shown in the attached figure 2As shown in , it can be seen that the surface of the cladding layer is relatively smooth, dense and uniform, and the finish is relatively good. Under the condition of single-pass cladding, the overlapping degree of ...

Embodiment 2

[0036] Laser cladding of martensitic heat-resistant steel. The chemical composition and mass percentage of each element of martensitic heat-resistant steel are: C: 0.12%; Si: 0.21%; Mn: 0.79%; Cr: 9.02%; Mo: 1.05%; Co: 0.96%; V: 0.20 %; Nb: 0.063%; N: 0.040%; B: 0.025%; Fe: balance. Laser cladding: the mass percentage composition of each powder is: C: 0.01%; Cr: 16.39%; Ni: 2.03%; Fe: 80.59%. Using single-pass cladding, the process parameters of the laser cladding are: laser power 2.5KW, spot diameter 5mm, scanning speed 300mm / min, defocus 30mm, protective gas: air. The powder feeding speed is 1.1g / min, and the powder feeding gas flow rate is 10L / min.

[0037] The microstructure observation of the laser cladding sample with a scanning speed of 300mm / min is carried out, as shown in the attached Figure 4 As shown in -B, it can be seen that the structure of the three regions is uniform and dense, and the transition layer in the middle is closely connected with the adjacent re...

Embodiment 3

[0039] Laser cladding of martensitic heat-resistant steel. The chemical composition and mass percentage of each element of martensitic heat-resistant steel are: C: 0.12%; Si: 0.21%; Mn: 0.79%; Cr: 9.02%; Mo: 1.05%; Co: 0.96%; V: 0.20 %; Nb: 0.063%; N: 0.040%; B: 0.025%; Fe: balance. Laser cladding: the mass percentage composition of each powder is: C: 0.01%; Cr: 16.39%; Ni: 2.03%; Fe: 80.59%. Using single-pass cladding, the process parameters of the laser cladding are: laser power 2.5KW, spot diameter 5mm, scanning speed 350mm / min, defocus 30mm, protective gas: air. The powder feeding speed is 1.3g / min, and the powder feeding gas flow rate is 10L / min.

[0040] The microstructure observation of the laser cladding sample with a scanning speed of 350mm / min is carried out, as shown in the attached Figure 4 As shown in -C, it can be seen that the structure of the three regions is uniform and dense, and the transition layer in the middle is closely connected with the adjacent re...

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Abstract

The invention relates to martensite heat resisting cast steel defect repair welding powder and a repair welding method. The repair welding powder comprises 0.005 to 0.02% of C, 12 to 18% of Cr, 1 to 3% of Ni, and the balance Fe. Laser cladding powder is placed into a powder feeding cylinder of laser cladding, through synchronous powder feeding, laser cladding is carried out, and a cladding layer is obtained. Single cladding is adopted, the laser power is 2.5 KW, the spot diameter ranges from 2 to 5 mm, the scanning speed is 250 mm / min to 400 mm / min, the defocusing amount is 30 mm, air serves protection gas, the powder feeding speed is 1.1 to 1.4 g / min, the powder feeding air flow is 10 L / min, iron-based ally powder is cheap, and the re-production manufacturing cost is reduced; the repair welding powder is close to the main component of martensite heat resisting steel, under the laser heat source influence, the tight connection is achieved, and the relative uniformity of whole hardnessof a sample can be ensured.

Description

technical field [0001] The invention belongs to the technical field of laser processing, and relates to a repair welding powder and a repair welding method for martensitic heat-resistant cast steel defects; in particular, a laser repair welding method for defects in 9Cr martensitic heat-resistant cast steel, which is mainly used for casting casting Defect fixes. Background technique [0002] The development of heat-resistant steel is closely related to the progress of energy and power machinery. With the further intensification of energy and environmental pressure, the advantages of ultra-supercritical power generation technology are prominent in the development of thermal power generation and nuclear energy conduction technology. Martensitic heat-resistant steel is widely used in boiler power plants because of its good thermophysical properties and low price. Experts from various countries continue to develop and improve it. The United States has successively proposed pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/40C23C24/10C22C38/02C22C38/04C22C38/22C22C38/30C22C38/24C22C38/26C22C38/32
CPCC22C38/001C22C38/004C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26C22C38/30C22C38/32C22C38/40C23C24/103
Inventor 董治中刘建宇任楷宁保群王志奇
Owner TIANJIN UNIVERSITY OF TECHNOLOGY