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Laser scanning method for rapid prototyping of superalloy structural parts

A high-temperature alloy and laser scanning technology, applied in the field of metal powder melting and forming, to achieve a high degree of controllability, improve mechanical properties and surface accuracy, and be suitable for promotion and application

Active Publication Date: 2015-12-30
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a laser scanning method for rapid prototyping of superalloy structural parts that improves the heat distribution of the molten pool and can effectively avoid deformation and cracking defects

Method used

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  • Laser scanning method for rapid prototyping of superalloy structural parts

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A high-temperature alloy slice layer is divided into three areas A1, B1, and C1, and the area S of the A1 area is 0.15mm 2 , using the "back" shape scanning method, the area S of B1 area is 0.5mm 2 , using the stripe-shaped scanning method, the area S of the C1 area is 2.0mm 2 , using the checkerboard scanning method;

[0033] The particle size of the powder is 20 μm, and the layer thickness is 50 μm;

[0034] The scanning power of the laser is 200W, the scanning speed is 600mm / s, the scanning point distance is 20μm, and the scanning distance is 0.1m during the forming scanning; the scanning power of the laser is 150W, the scanning speed is 1000mm / s, and the scanning point distance is 10μm. Scanning distance 0.05mm;

[0035] The laser wavelength range is 980nm, and the protective gas is argon.

Embodiment 2

[0037] A high-temperature alloy slice layer is divided into three areas: A2, B2, and C2, and the thickness H of the structural part in the scanning area of ​​A2 is 0.4mm 2 , using the "back" shape scanning method, the thickness H of the structural part in the B2 scanning area is 1.0mm 2 , using the stripe-shaped scanning method, the thickness H of the structural part in the C2 scanning area is 6mm 2 , using the checkerboard scanning method;

[0038] The particle size of the powder is 25 μm, and the layer thickness is 45 μm;

[0039] The scanning power of the laser is 250W, the scanning speed is 700mm / s, the scanning point pitch is 30μm, and the scanning spacing is 0.2m during the forming scanning; the scanning power of the laser is 160W, the scanning speed is 1100mm / s, and the scanning point pitch is 15μm when scanning the outer surface. Scanning distance 0.06mm;

[0040] The laser wavelength range is 1.07μm, and the protective gas is argon.

Embodiment 3

[0042] A high-temperature alloy slice layer is divided into three areas A3, B3, and C3, and the area S of the A3 area is 0.1mm 2 , using the "back" shape scanning method, the area S of B3 area is 0.8mm 2 , using the stripe-shaped scanning method, the area S of the C3 area is 3.0mm 2 , using the checkerboard scanning method;

[0043] The particle size of the powder is 30 μm, and the layer thickness is 45 μm;

[0044] The scanning power of the laser is 400W, the scanning speed is 1000mm / s, the scanning point pitch is 50μm, and the scanning spacing is 0.5m during the forming scanning; the scanning power of the laser is 200W, the scanning speed is 1500mm / s, and the scanning point pitch is 30μm when scanning the outer surface. Scanning distance 0.2mm;

[0045] The laser wavelength range is 9.6 μm, and the protective gas is argon.

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Abstract

The invention discloses a laser scanning method used for fast forming a high-temperature alloy structural member. The method comprises the following steps that (a), according to the geometric feature comprising the area S, the wall thickness H and the shape P and the precision requirement of the structural member, a geometric model of each layer is divided into a plurality of areas, scanning methods for the different areas are determined, and the rectangular-ambulatory-plane shape, the stripe shape and the chess board shape are involved in the scanning methods; (b), forming scanning is carried out, the different areas in each layer are sequentially scanned, and the structural member is formed; (c), the outer surface is scanned, the outer surface of the formed structural member is scanned for the second time, and fast repair and heat treatment on the outer surface of the structural member are realized. According to the method, all the slice layers are divided into areas, the different scanning methods are selected, and therefore the problems of stress deforming and cracking caused by heat concentration are effectively avoided; the mechanical property and the surface precision of the high-temperature alloy structural part fast formed are improved.

Description

technical field [0001] The invention belongs to the technical field of metal powder fusion forming, and relates to a laser scanning method for rapid forming of high-temperature alloy structural parts. Background technique [0002] Superalloys have a series of excellent properties such as high melting point, high temperature strength, low vapor pressure, low expansion coefficient, and good corrosion resistance in many media, and are widely used in the fields of weaponry, medical equipment, and communication launch equipment. However, the poor formability of superalloys limits the expansion of its application range. At present, most high-temperature alloys are formed by powder metallurgy. This forming process requires expensive tooling and molds, and the process is complicated. It is difficult to form parts with complex three-dimensional structures. Therefore, the development of advanced forming technology for superalloys has become one of the research hotspots. As a new typ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105
Inventor 王林志范树迁
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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