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Liquid nitrogen quenching sample preparation method for hard alloy material

A cemented carbide and liquid nitrogen technology, which is applied in the field of heat treatment, can solve the problems of crushing jaws and vibrating abrasive body damage, affecting the accuracy of inspection results, and serious equipment loss, etc., and achieves convenient crushing and grinding, convenient and quick processing, and improved The effect of service life

Inactive Publication Date: 2012-10-03
XINING SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the extremely high hardness is one of the characteristics of ferro-tungsten, it is impossible to carry out conventional crushing and grinding. The general sample preparation equipment cannot meet the inspection particle size requirements, and the equipment itself is extremely worn out. Due to the extremely high hardness of ferro-tungsten It cannot be completely crushed and it is easy to cause damage to the crushing jaw and vibrating grinding body. It is easy to cause contamination and loss during the sample preparation process, and it will also affect the accuracy of the test results.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The method of the invention utilizes the characteristics of liquid nitrogen being inert, colorless, odorless, non-corrosive, non-flammable and extremely low temperature to rapidly cool the ferro-tungsten, grind it after crushing, and prepare a standard test sample.

[0011] A kind of hard alloy material liquid nitrogen rapid cooling sample preparation method of the present invention is realized by the following steps: put the sample into the heat preservation tank, add liquid nitrogen to completely immerse the sample block for rapid cooling and leave it for 30 minutes. When the liquid nitrogen volatilizes to less than 1 / 2 of the height of the sample, you can continue to add liquid nitrogen to ensure that the sample is completely immersed in the liquid nitrogen. After completing this step, take out the sample for crushing and grinding.

[0012] Adopting the method of the present invention to prepare test samples does not change the chemical composition of the sample, does...

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PUM

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Abstract

The invention relates to the technical field of heat treatment, in particular to a liquid nitrogen quenching sample preparation method for a hard alloy material. The method comprises the following steps: putting the hard alloy material in a heat insulation tank, adding liquid nitrogen till a sample block is completely immersed, quenching the sample block; keeping the sample block in the liquid nitrogen for 30min, wherein the nitrogen liquid can be added again if the nitrogen liquid is volatilized to be lower than a half of the height of the sample block, so as to enable the sample to be completely immersed in the nitrogen liquid; 30min later, taking out the sample and breaking and grinding the sample. According to the method provided by the invention, brittleness of ferrotungsten is increased after the ferrotungsten is immersed in nitrogen liquid and quenched; the early-stage treatment of the sample is convenient and quick. When the method provided by the invention is used for preparing a sample to be detected, the chemical components of the sample are not changed and no impurity is introduced into the sample, so that the sample is very typical; the quenched sample is easy to break and grind, equipment for sample preparation is not damaged and the service life of the equipment for sample preparation is prolonged.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a sample preparation method for hard alloy material quenched with liquid nitrogen. Background technique [0002] Ferro-tungsten is an alloy composed of tungsten and iron, which is used as an alloy additive for steelmaking. Commonly used ferro-tungsten contains 70% and 80% tungsten. The chemical composition of cemented carbide materials directly affects the properties of steel, so it is necessary to accurately test and analyze the chemical composition contained in it. Due to the extremely high hardness is one of the characteristics of ferro-tungsten, it is impossible to carry out conventional crushing and grinding. The general sample preparation equipment cannot meet the inspection particle size requirements, and the equipment itself is extremely worn out. Due to the extremely high hardness of ferro-tungsten It cannot be completely crushed and it is easy to cause damage to...

Claims

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Application Information

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IPC IPC(8): G01N1/42
Inventor 陈列张豫海张虎
Owner XINING SPECIAL STEEL