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A kind of metallographic preparation method of tungsten-nickel-iron alloy

A tungsten-nickel-iron alloy and tungsten alloy technology is applied in the field of material surface structure determination, which can solve the problems of difficulty in precise control of corrosive agent concentration and corrosion time parameters, harm to human health and environment, and complicated corrosion process technology, so as to improve the grinding efficiency and solve the The effect of difficult recovery and clear and complete metallographic structure

Active Publication Date: 2020-04-28
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the method for the metallographic preparation of tungsten and its alloys reported above, the etchant nitric acid (HNO 3 ), sulfuric acid (H 2 SO 4 ), hydrochloric acid (HCl) and sodium hydroxide (NaOH) are strong acids or bases, which are highly corrosive, and potassium ferricyanide (K 3 Fe(CN) 6 ) is oxidizing and toxic, and hydrofluoric acid (HF) is highly oxidizing, corrosive and highly toxic. The use of such chemical reagents seriously endangers human health and the environment, and the concentration of corrosive agents and corrosion time parameters during the corrosion process are difficult to accurately control , the corrosion process is complicated, and there are a large number of corrosion defects on the surface of the corroded workpiece, and it is difficult to obtain a clear and complete microstructure of the tungsten alloy. Obstacles, for this reason, it is urgent to find a high-efficiency, non-polluting and harmful technology for preparing high-definition and high-quality tungsten alloy microstructure

Method used

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Embodiment 1

[0021] Such as figure 1 Shown, a kind of tungsten-nickel-iron alloy metallographic preparation method of the present invention, raw material is 95W-3.5Ni-1.5Fe, comprises the following steps:

[0022] The raw material is cut into a sample with a diameter of Φ10×thickness of 7mm by EDM, and the surface metamorphic layer is quickly removed by grinding with a 120# diamond grinding wheel, and the removal depth is 0.3mm.

[0023] Set the sample in an epoxy resin fixture with a diameter of 30mm and a height of 20mm, and use 400#, 800#, and 1200# metallographic water sandpaper to roughly grind the surface of the sample in turn on the grinding and polishing machine, and the grinding line speed is 3.6m / s. The grinding pressure is 15kPa, and the effective grinding time of sandpaper of each particle size is 8min; then, the metallographic water sandpaper of 2000#, 3000#, 5000# is used to finely grind the surface of the sample in turn, the grinding line speed is 1.5m / s, and the grinding pr...

Embodiment 2

[0026] Such as figure 1 Shown, a kind of tungsten-nickel-iron alloy metallographic preparation method of the present invention, raw material is 95W-3.5Ni-1.5Fe, comprises the following steps:

[0027] The raw material is cut into a sample with a diameter of Φ15×thickness 10mm by EDM, and the surface metamorphic layer is quickly removed by milling to a depth of 1mm.

[0028] Set the sample in an epoxy resin fixture with a diameter of 30mm and a height of 20mm, and then use 400#, 800#, 1200#, 2000#, 3000# electroplated diamond grinding discs to grind the sample on a polishing machine. The pressure is 11kPa, the grinding speed is 1.5m / s, and the effective grinding time of each particle size of electroplated diamond grinding disc is 15min. After grinding, the sample is ground with W1.5, W0.5 diamond spray or diamond grinding paste respectively. The linear speed is 3m / s, the grinding pressure is 20kPa, and when the particle size of the abrasive is changed during the grinding proce...

Embodiment 3

[0031] Such as figure 1 Shown, a kind of tungsten-nickel-iron alloy metallographic preparation method of the present invention, raw material is 95W-3.5Ni-1.5Fe, comprises the following steps:

[0032]The raw material is cut into a sample with a diameter of Φ15×thickness 7mm by EDM, and the surface metamorphic layer is quickly removed by a 120# diamond grinding wheel, and the removal depth is 0.5mm.

[0033] Set the sample in an epoxy resin fixture with a diameter of 30mm and a height of 20mm, and then use 400#, 800#, 1200#, 2000#, 3000# electroplated diamond grinding discs to grind the sample on a polishing machine. The pressure is 15kPa, the grinding speed is 2.1m / s, and the effective grinding time of each particle size of electroplated diamond grinding disc is 15min to ensure that the surface of each sample is ground flat. After grinding, use W1.5 and W0.5 diamond spray to control the sample respectively Rough polishing is performed on the workpiece, the polishing line spee...

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Abstract

The invention relates to a preparation method of a tungsten nickel iron alloy metallographic phase, which belongs to the technical field of determination of a material surface structure. A machining method is mainly adopted to obtain a metallographic phase tissue structure of tungsten nickel iron alloy. The preparation method comprises a sample preparation step, a grinding step and a polishing step. In the sample preparation process, the tungsten alloy is cut into a sample piece, and after the cold mounting is performed on the sample, a remaining surface metamorphic layer in the electric sparkmachining is removed. In the grinding process, the tungsten alloy sample is inserted into an epoxy resin clamp, the surface of the sample is ground, after the grinding, the sample is ground by adopting diamond spray or diamond grinding paste, and finally the sample is ultrasonically cleaned. In the polishing process, after the sample is polished, the sample is ultrasonically cleaned and dried. According to the preparation method of the tungsten nickel iron alloy metallographic phase prepared in the invention, after the grinding and polishing, the metallographic phase observation can be performed without chemical corrosion, and the obtained metallographic phase is clear and complete in tissue structure and has no defects such as over-corrosion or corrosion pits; and the whole preparation process is safe and environmentally friendly, the operability is high, and the preparation process is simple and reliable.

Description

technical field [0001] The invention belongs to the technical field of material surface structure measurement, and relates to a method for preparing a tungsten-nickel-iron alloy metallographic structure. Background technique [0002] Tungsten alloy has excellent physical and chemical properties such as high density, high strength, good ductility, corrosion resistance and excellent ray absorption ability, and has been widely used in military, aerospace, nuclear energy and other fields. The properties of tungsten alloy materials and the surface quality after processing are crucial to the performance of tungsten alloy parts. The preparation of tungsten alloy materials with excellent performance and the processing of tungsten alloy parts with high-quality and high-integrity surfaces are the key to ensuring the reliable application of parts. Metal materials Many properties, including yield strength, elongation, ultimate tensile strength, heat conduction, corrosion resistance, ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/32G01N1/36
CPCG01N1/286G01N1/32G01N1/36G01N2001/2866G01N2001/2873G01N2001/364
Inventor 郭江焦振华董志刚康仁科郭东明
Owner DALIAN UNIV OF TECH
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