Process method for repairing and strengthening 17-4PH part by laser

A technology of laser repair and process method, applied in the direction of metal material coating process, coating, etc., can solve the problems of blade fracture failure, wear, harsh working conditions, etc., to achieve small impact, low dilution rate, small process heat affected zone Effect

Inactive Publication Date: 2021-04-23
浙江翰德圣智能再制造技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The working conditions of the high-pressure pump blades are very harsh. With the long-term uninterrupted operation of the high-pressure pump unit, the high-pressure pump blades have been subjected to high temperature, high pressure, centrifugal force, steam force, steam excitation force, corrosion and vibration, and water droplet impact in the wet steam area for a long time. Due to the joint effect of corrosion, wear, corrosion, fatigue and other damages will inevitably occur, and in severe cases, it may even lead to problems such as blade fracture and failure, which will cause the unit to shut down, seriously affecting the power generation and work efficiency of the unit

Method used

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  • Process method for repairing and strengthening 17-4PH part by laser
  • Process method for repairing and strengthening 17-4PH part by laser

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of technological method of laser repair strengthening 17-4PH parts, comprises the following steps:

[0039] (1) Remove defects and oil stains on the surface of 17-4PH parts (substrates);

[0040] (2) Use (adjusted and optimized) composite laser melting deposition powder for repair and strengthening to obtain repair parts;

[0041] (3) Carry out aging heat treatment to described restoration, further strengthen coating performance;

[0042] (4) Finishing.

[0043] Preferably, in step (1), the 17-4PH part is clamped on a lathe, and after the oil stain is cleaned with a cleaning agent, the surface defects of the 17-4PH part are machined to expose fresh metal.

[0044] Preferably, in step (2), the dry composite laser melting deposition powder is added to a laser powder feeder, and then repaired by laser melting deposition to obtain a repaired part.

[0045] Preferably, in step (2), the dry composite laser melting deposition powder is added to the laser powder feede...

Embodiment 2

[0051] A kind of technological method of laser repair strengthening 17-4PH parts, comprises the following steps:

[0052] (1) Remove defects and oil stains on the surface of 17-4PH parts (substrates);

[0053] (2) Use (adjusted and optimized) composite laser melting deposition powder for repair and strengthening to obtain repair parts;

[0054] (3) Carry out aging heat treatment to described restoration, further strengthen coating performance;

[0055] (4) Finishing.

[0056] In this embodiment, in step (1), the 17-4PH part is clamped on the lathe, and after the oil stain is cleaned with a cleaning agent, the surface defects of the 17-4PH part are machined to expose fresh metal.

[0057] In this embodiment, in step (2), the dry composite laser melting deposition powder is added to a laser powder feeder, and then repaired by laser melting deposition to obtain a repaired part.

[0058] In this embodiment, in step (2), the dry composite laser melting deposition powder is added...

Embodiment 3

[0064] A kind of technological method of laser repair strengthening 17-4PH parts, comprises the following steps:

[0065] (1) Remove defects and oil stains on the surface of 17-4PH parts (substrates);

[0066] (2) Use (adjusted and optimized) composite laser melting deposition powder for repair and strengthening to obtain repair parts;

[0067] (3) Carry out aging heat treatment to described restoration, further strengthen coating performance;

[0068] (4) Finishing.

[0069] In this embodiment, in step (1), the 17-4PH part is clamped on the lathe, and after the oil stain is cleaned with a cleaning agent, the surface defects of the 17-4PH part are machined to expose fresh metal.

[0070] In this embodiment, in step (2), the dry composite laser melting deposition powder is added to a laser powder feeder, and then repaired by laser melting deposition to obtain a repaired part.

[0071] In this embodiment, in step (2), the dry composite laser melting deposition powder is added...

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Abstract

The invention discloses a process method for repairing and strengthening a 17-4PH part by laser. The process method comprises the following steps that (1) defects and oil stains on the surface of the 17-4PH part (base material) are removed; (2) (adjusted and optimized) composite laser melting deposition powder is adopted for repairing and strengthening, and a repaired part is obtained; (3) aging heat treatment is performed on the repaired part to further reinforce the performance of a coating; and (4) finish machining is performed. The laser repaired and strengthened 17-4PH part obtained through the process method for repairing and strengthening the 17-4PH part by lasers is high in hardness and excellent in abrasion resistance, the use performance is improved, and the service life is prolonged. Compared with the average hardness 380HV of a 17-4PH homogeneous repair layer, the average hardness of a deposited repair layer using the powder can reach 435HV, and the abrasion resistance is improved by about 20%.

Description

technical field [0001] The invention relates to the technical field of 17-4PH laser repair and strengthening, in particular to a process method for laser repair and strengthening of 17-4PH parts. Background technique [0002] 17-4PH alloy is a precipitated, hardened, martensitic stainless steel composed of copper, niobium / collum. Features: After heat treatment, the mechanical properties of the product are more perfect, and the compressive strength can reach as high as 1100-1300Mpa (160-190ksi). [0003] 17-4PH is mostly used for high-pressure pump blades. It is the core component of the entire high-pressure pump system, and it is also one of the most delicate and important parts. Its function is to convert the kinetic energy of high-temperature, high-pressure, and high-speed steam into mechanical energy. The working conditions of the high-pressure pump blades are very harsh. With the long-term uninterrupted operation of the high-pressure pump unit, the high-pressure pump bl...

Claims

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Application Information

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IPC IPC(8): B22F7/08C23C24/10C22C38/02C22C38/04C22C38/42C22C38/48C22C38/50C21D1/00C21D6/00
CPCB22F7/062C23C24/103C22C38/02C22C38/04C22C38/50C22C38/42C22C38/48C21D1/00C21D6/004C21D6/005C21D6/008B22F2007/068
Inventor 仲才迟长泰徐泽林史望兴默罕默德
Owner 浙江翰德圣智能再制造技术有限公司
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