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Powder capable of being used for improving fracture performance of stainless steel surface micro crack laser repaired piece

A laser repair and fracture performance technology, applied in the powder field of the alloy material technology field, can solve problems such as poor fusion and cracks in the repair layer, and achieve the effect of improving fracture performance and good process performance.

Inactive Publication Date: 2017-06-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional laser repair additive powder also has some defects during use, such as poor fusion of the bonding surface between the laser repair layer and the substrate, cracks in the repair layer, etc.
At present, there is no metal powder dedicated to laser repair to improve the fracture performance of the workpiece, especially for stainless steel parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: By weight percentage, it contains 4% nanometer WC (50-80nm), and the balance is micron-sized stainless steel powder (30-50μm). The stainless steel powder contains 0.08% C, 0.5% Si, 1.46% Mn, 0.03% P, 0.005% S, 19% Cr, 9.5% Ni, 0.5% Mo, and the balance is Fe . Using the above formula, various powders are thoroughly mixed through mechanical ball milling, then blended with absolute ethanol and further mixed evenly.

[0015] Before the laser cladding repair process, dry the composite powder at a temperature of 150°C for 2 hours; use 400-2000 sandpaper to polish the area to be repaired in sequence, then clean it with absolute ethanol, and then dry it; The proportioned composite powder is evenly pre-set on the micro-cracks on the surface of the base stainless steel to be repaired, and the pre-set thickness is controlled at 0.8-1.2mm to ensure smooth surface and low porosity; laser repair technology is used to repair micro-cracks on the surface of stainless stee...

Embodiment 2

[0019] Embodiment 2: By weight percentage, it contains 1% nano-WC (50-80nm), and the balance is micron-sized stainless steel powder (30-50μm). The stainless steel powder contains 0.08% C, 0.5% Si, 1.46% Mn, 0.03% P, 0.005% S, 19% Cr, 9.5% Ni, 0.5% Mo, and the balance is Fe . Using the above formula, various powders are thoroughly mixed through mechanical ball milling, then blended with absolute ethanol and further mixed evenly. The method of repairing cracks by laser is the same as in Example 1. Under the load of 20kN, the fracture parameter COD of the specimen is reduced by 15.3%, and the fracture performance is improved.

Embodiment 3

[0020] Embodiment 3: by weight percentage, it contains 7% nanometer WC (50-80nm), and the balance is micron-sized stainless steel powder (30-50μm). The stainless steel powder contains 0.08% C, 0.5% Si, 1.46% Mn, 0.03% P, 0.005% S, 19% Cr, 9.5% Ni, 0.5% Mo, and the balance is Fe . Using the above formula, various powders are thoroughly mixed through mechanical ball milling, then blended with absolute ethanol and further mixed evenly. The method of repairing cracks by laser is the same as in Example 1. Under the load of 20kN, the fracture parameter COD of the specimen is reduced by 17.6%, and the fracture performance is improved.

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Abstract

The invention belongs to the technical field of alloy materials, and discloses powder capable of being used for improving the fracture performance of a stainless steel surface micro crack laser repaired piece. The composite powder comprises, by weight percent, 1%-10% of nano WC and the balance micron-level stainless steel powder. The above powder is subjected to mechanical ball milling to be sufficiently mixed and then is blended through absolute ethyl alcohol to be further evenly mixed. The stainless steel powder comprises, by weight percent, 0.08% of C, 0.5% of Si, 1.46% of Mn, 0.03% of P, 0.005% of S, 19% of Cr, 9.5% of Ni, 0.5% of Mo and the balance Fe. The provided composite powder is particularly suitable for laser repairing of a stainless steel component surface micro crack with the fracture performance requirement. Under the laser repairing action, the composite powder and the stainless steel surface micro crack are sufficiently and evenly fused, grain of a repairing layer is refined through nano WC powder, the sharp end of the surface micro crack is effectively closed, the problem about the stainless steel surface micro crack is solved, and the fracture performance of a workpiece is greatly improved.

Description

technical field [0001] The invention relates to a powder in the technical field of alloy materials, in particular to a powder for improving the fracture performance of laser repair parts for micro-cracks on the surface of stainless steel. Background technique [0002] In the field of repair technology, traditional repair methods, such as argon arc welding and plasma spraying, although the process is simple, have a large amount of heat input during the repair process, and thermal cracks are prone to appear in the heat-affected zone, which is prone to cracking or even falling off during use. However, it is difficult to restore and improve the performance of waste parts, so the application of these methods has great limitations. [0003] Laser repair technology is to add materials to the micro cracks on the surface of the substrate, and use high-energy density laser beams to rapidly fuse it together with the thin layer on the surface of the substrate, so as to achieve the purpo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C38/44C22C38/04C22C38/02
CPCC23C24/103C22C38/02C22C38/04C22C38/44
Inventor 蒋玮蒋险峰房广雷
Owner DALIAN UNIV OF TECH
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