Cobalt base alloy powder for laser repair of moving turbocharger blade of internal combustion engine

A technology of laser repair and cobalt-based alloy, which is applied in the coating process and coating of metal materials, can solve the problems of poor weldability, crack pores, and whitening of materials, and achieve high-temperature oxidation resistance and good toughness. Anti-wear and less prone to cracking

Active Publication Date: 2014-12-24
上海大陆天瑞激光表面工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Since the moving blade is made of superalloy, the weldability of the material is very poor. The conventional repair method is welding. The material used is generally cast iron welding rod, but these materials have problems during repair and use, such as cracking. , whitening, porosity, desoldering, etc.
The laser cladding repair method can solve some of the above welding problems very well, but laser cladding also requires corresponding powder materials. At present, there is no corresponding material for laser cladding of heat-resistant cast iron.
In the past, some materials with good cladding effect on other ferrous metals would have defects such as cracks and pores when cladding this kind of cast iron. Therefore, in order to repair the moving blades of the internal combustion engine supercharger, we specially invented it through theoretical analysis and experimental tests. A special powder for laser repair of internal combustion engine supercharger rotor blades

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] The internal combustion motor blades of a locomotive and rolling stock factory in Dalian were in use. 20 blades of a supercharger were damaged, of which 5 blades were the top blades, and the rest were hit by foreign objects, which caused the blades to partially fall off or have pits. The blade cracks along the sharp corner of the dropped block, and the crack length is within 5mm.

[0020] Firstly, carry out flaw detection inspection, and manually clean the cracks until all the cracks are cleaned up. After the flaw detection is free of defects, the worn part is polished to reveal the metallic luster. After the flaw detection is free of defects, the cleaned part is cleaned to remove all dirt and oxides in the area. Grind to a suitable groove and use this material for laser cladding. The laser cladding parameters are "power: 1600W, spot diameter: 3mm, scanning speed: 20mm / s, powder thickness: 0.5mm." The powder with a particle size of 150 mesh is used for cladding, and th...

Embodiment 2

[0023] A certain type of internal combustion engine supercharger rotor blade, erosion and wear. The wear depth of the intake edge is more than 1mm, and the thickness is thinned and needs to be repaired.

[0024] Firstly, carry out the flaw detection inspection to confirm that there are no cracks and grind the worn parts to reveal the metallic luster. After the flaw detection is free of defects, clean the cleaned parts to remove all dirt and oxides in the area. Use this material for laser cladding. The laser cladding parameters are "power: 2500W, spot diameter: 3mm, scanning speed: 15mm / s, powder thickness: 0.5mm." The powder with a particle size of 150 mesh is used for cladding, and the composition is: Cr: 15%; Ni : 10%; Si: 0.5%; Nb: 0.5%; Y: 0.2%; W: 1.2%; B; 1%; Co: balance.

[0025] After cladding, machining restores the original size and precision to meet the design requirements. After no defects were detected by coloring flaw detection, it was assembled on the test be...

Embodiment 3

[0027] A certain type of internal combustion engine supercharger rotor blade, erosion and wear. The wear depth of the exhaust edge is more than 1mm, and the thickness is thinned and burrs appear, and cracks are generated along the sharp corners of the burrs.

[0028] Firstly, carry out flaw detection inspection, and manually clean the cracks until all the cracks are cleaned up. After the flaw detection is free of defects, the worn part is polished to reveal the metallic luster. After the flaw detection is free of defects, the cleaned part is cleaned to remove all dirt and oxides in the area. Grind to a suitable groove and use this material for laser cladding. The laser cladding parameters are "power: 1200W, spot diameter: 3mm, scanning speed: 12mm / s, powder thickness: 0.5mm." The powder with a particle size of 150 mesh is used for cladding, and the composition is: Cr: 8%; Ni : 5%; Si: 0.1%; Nb: 0.3%; Y: 0.1%; W: 0.8%; B; 0.5%; Co: balance.

[0029] After cladding, machining...

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PUM

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Abstract

The invention discloses cobalt base alloy powder for laser repair of a moving turbocharger blade of an internal combustion engine. The cobalt base alloy powder comprises Co, Ni, Cr and Si and is characterized by also comprising Nb, Y, W and B, wherein all the components are shown as follows (in percentage by mass): 8-15% of Cr, 5-10% of Ni, 0.1-0.5% of Si, 0.3-0.5% of Nb, 0.1-0.3% of Y, 0.8-1.2% of W, 0.5-1% of B and the balance of Co. The cobalt base alloy powder is moderate in hardness and strength, favorable in toughness and high-temperature oxidation resistance, extremely low in crack tendency and capable of forming a compact metallurgical bonding layer together with a blade matrix and meeting the requirement for laser cladding of the moving turbocharger blade.

Description

technical field [0001] The invention relates to an alloy powder material suitable for laser cladding, in particular to a cobalt-based alloy powder with crack resistance and high temperature oxidation resistance for laser repair of internal combustion engine supercharger moving blades, which belongs to the international patent classification C23C24 / 10(2006.01) I technical field in the table. Background technique [0002] The supercharger is an important equipment for diesel locomotives to increase power and reduce energy consumption. In the supercharger, the moving blade is the core component. Since it works at a high temperature of 650-700°C, the working speed is as high as 10000-20000rpm. At such high temperatures and rotational speeds, the blades often wear out. Solid particles in the working medium of the supercharger can also cause damage to the blades. Once the blade is damaged, the dynamic balance of the rotor will be damaged and cause mechanical vibration, which wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C32/00
Inventor 张静波陈江朴新欣
Owner 上海大陆天瑞激光表面工程有限公司
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