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Method for constructing coarse grain-fine grain gradient structure on surface of metal material and gradient structure

A technology of metal materials and gradient structures, which is applied in the processing field of constructing coarse-grain-fine-grain gradient structures on the surface of metal materials, can solve problems such as inability to apply brittle materials, weaken the mechanical properties of workpieces, and fail to form gradient structures, etc., reaching the selection range Wide, controllable surface roughness effect

Active Publication Date: 2016-08-03
ZHEJIANG IND & TRADE VACATIONAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method of strong surface plastic deformation has certain limitations. For example, the surface roughness of the sample after ultrasonic shot peening increases with the degree of surface plastic deformation, which weakens the mechanical properties of the workpiece.
In addition, the method of strong plastic deformation on the surface can only prepare a gradient structure with nanocrystals on the surface and coarse crystals inside, and the thickness of the gradient nanostructure layer on the surface of the material is only 100-300 μm, which limits the potential for industrial application
The surface strong plastic deformation technology has high requirements on the shape of the sample. For example, the Chinese invention patent "High-speed processing method for realizing ultra-fine grain structure on the surface of metal materials" (publication number CN101323900A) proposes a mechanical treatment method through high-speed surface plastic deformation , which is characterized by high-speed rotation of the workpiece, but the processing tool does not rotate, this method is only suitable for ultra-fine processing of the surface of the rotary part
In addition, the type of substrate material suitable for the surface strong plastic deformation method is limited, only Cu, IF steel, TWIP steel, stainless steel, etc. with good plasticity, otherwise the surface of the material will be broken and the gradient structure cannot be formed, that is, it cannot be applied to brittle materials

Method used

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  • Method for constructing coarse grain-fine grain gradient structure on surface of metal material and gradient structure
  • Method for constructing coarse grain-fine grain gradient structure on surface of metal material and gradient structure
  • Method for constructing coarse grain-fine grain gradient structure on surface of metal material and gradient structure

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specific Embodiment 1

[0039] Concrete embodiment 1 Gradient structure material is constructed on the surface of the coarse-grained material;

[0040] (1) Observing the microstructure through a metallographic microscope, it is a coarse-grained structure, such as figure 1 shown;

[0041] (2) Cold-roll the bar to a thin plate with a thickness of 1-3 mm to obtain the cold-rolled structure, such as figure 2 shown;

[0042] (3) After grinding and polishing the surface of the cold-rolled sheet, clean it with acetone or alcohol to remove oil stains;

[0043] (4) Set the laser spot size to 3-5mm, the overlap rate to 30-50%, the scanning rate to 1-20mm / s, and the laser power to 500-2000w, and then perform unilateral laser surface heat treatment on the workpiece.

[0044] like image 3As shown, the obtained material has a gradient structure in which the surface of one side is coarse and the grain size gradually decreases from the surface to the inside. The coarse grain size is about 20-60 μm, the fine g...

specific Embodiment 2

[0045] Concrete embodiment 2 Gradient structure material is constructed on the surface of the fine-grained material;

[0046] (1) Observe the microstructure through a metallographic microscope, which is a cold-rolled structure;

[0047] (2) Insulate the cold-rolled TWIP steel plate at 850°C for 1h, so that uniform recrystallization behavior occurs inside to obtain a fine-grained structure, such as Figure 4 shown;

[0048] (3) Process the heat-treated sample into a thin plate with a thickness of 1 mm by wire cutting;

[0049] (4) Grind and polish the surface of the thin plate, and clean the surface with acetone to remove oil stains;

[0050] (5) Set the laser spot size to 3-5mm, the overlap rate to 30%-50%, the scanning speed to 1mm / s-20mm / s, and the laser power to 500w-2000w, and then perform unilateral laser surface heat treatment on the workpiece.

[0051] like Figure 5 As shown, the obtained material has a gradient structure with coarse grains on one side of the surfa...

specific Embodiment 3

[0052] Specific embodiment 3 Double-sided laser surface heat treatment constructs large grain-small grain-large grain "sandwich" type gradient structure material;

[0053] (1) Observing the microstructure through a metallographic microscope, it is a coarse-grained structure;

[0054] (2) Cold-roll the bar to a thin plate with a thickness of 1-3 mm to obtain the cold-rolled structure;

[0055] (3) Clean the surface of the cold-rolled sheet to remove oil stains;

[0056] (4) Set the laser spot size to 3-5mm, the overlap rate to 30-50%, the scanning rate to 1-20mm / s, and the laser power to 500-2000w, and then perform laser surface heat treatment on both the upper and lower surfaces of the workpiece.

[0057] like Figure 6-8 As shown, the obtained material is a coarse grain-fine grain-coarse grain "sandwich" gradient structure material, and there is no interface layer in the gradient structure.

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Abstract

The invention discloses a method for constructing a grain size gradient structure on the surface of a metal material. The method includes the following steps that pretreatment is performed on the metal material so that a cold rolled structure or a fine-grain structure can be obtained; then degreasing, surface grinding and polishing and other treatment are performed on a cold rolled plate or a fine-grain plate, and roughing and blackening treatment increasing the laser absorption efficiency of the surface of the cold rolled plate is performed; and a continuous laser device is adopted, reasonable parameters are set to perform laser heat treatment on the surface of the cold rolled plate, and the coarse grain-fine grain gradient structure is formed on the surface of the obtained metal material. The gradient structure material obtained through the processing method has the beneficial effects that the surface grain size is large, the core grain size is small, and no obvious interface layer exists; the coarse grain-fine grain gradient structure makes the thickness of the gradient structure on the surface of the metal material larger than that in the prior art, and the roughness of the surface of the gradient structure cannot be changed although surface processing treatment is performed.

Description

technical field [0001] The invention belongs to the technical field of metal material processing and preparation, and relates to a processing method that can be used to optimize the mechanical properties of metal materials or obtain special surface properties of metal materials, in particular to a processing method for constructing a coarse-grain-fine-grain gradient structure on the surface of metal materials method. Background technique [0002] Gradient structure material refers to the microstructure of the material (multi-finger grain scale) changes continuously from one side to the other side, so that the properties and functions of the material change continuously in a gradient. As a new type of structural material, its performance is unique, so it has broad application prospects in the fields of aerospace, machinery, transportation, and chemical industry. At present, there are two main methods to realize the preparation of grain size gradient structure in metal materi...

Claims

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Application Information

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IPC IPC(8): C21D1/09
CPCC21D1/09
Inventor 王坤童先金露凡汪耽韩福生刘东华
Owner ZHEJIANG IND & TRADE VACATIONAL COLLEGE
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