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Method for displaying high-strength steel grain size

A grain-size, high-strength steel technology for particle size analysis, sample preparation for testing, particle and sedimentation analysis, etc.

Inactive Publication Date: 2019-04-26
盛利维尔(常州)金属材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no dedicated carburizing heat treatment furnace in the laboratory, only ordinary box-type resistance furnace

Method used

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  • Method for displaying high-strength steel grain size
  • Method for displaying high-strength steel grain size

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] First process the high-strength steel wire into two beams with a thickness of 3mm, a length of 146mm, and a width of 11mm. In the middle of each beam and along the thickness direction, use a CNC cutting machine to open a slot whose length is 20% of the thickness of the beam. The slot The width is 1mm, and then drill a hole with a diameter of 8mm at a distance of 12.5mm from both ends. Use the same high-strength steel wire to make two distance bolts with a diameter of 14mm and a height of 11mm and prepare two hexagonal screws. Measure 0.16mL of concentrated sulfuric acid of analytical grade, pour it into 999.84mL of distilled water and stir evenly, weigh 0.4g of sodium phosphate and add it to the sulfuric acid solution, and stir evenly until completely dissolved. Put the sides of the two beams with the slots facing outwards, and screw them slightly through the holes with the hexagonal screws, then place the two distance bolts between the two beams, the distance between th...

Embodiment 2

[0028] First process the high-strength steel wire into two beams with a thickness of 2mm, a length of 146mm, and a width of 11mm. In the middle of each beam and along the thickness direction, use a CNC cutting machine to open a slot whose length is 20% of the thickness of the beam. The slot The width is 1mm, and then drill a hole with a diameter of 8mm at a distance of 12.5mm from both ends. Use the same high-strength steel wire to make two distance bolts with a diameter of 14mm and a height of 11mm and prepare two hexagonal screws. Measure 0.53mL of concentrated sulfuric acid of analytical grade, pour it into 999.47mL of distilled water and stir evenly, weigh 0.4g of sodium phosphate into the sulfuric acid solution, and stir evenly until completely dissolved. Put the sides of the two beams with the slots facing outwards, and screw them slightly through the holes with the hexagonal screws, then place the two distance bolts between the two beams, the distance between the centers...

Embodiment 3

[0030] First process the high-strength steel wire into two beams with a thickness of 2mm, a length of 146mm, and a width of 11mm. In the middle of each beam and along the thickness direction, use a CNC cutting machine to open a slot whose length is 20% of the thickness of the beam. The slot The width is 1mm, and then drill a hole with a diameter of 8mm at a distance of 12.5mm from both ends. Use the same high-strength steel wire to make two distance bolts with a diameter of 14mm and a height of 11mm and prepare two hexagonal screws. Measure 0.16mL of concentrated sulfuric acid of analytical grade, pour it into 999.84mL of distilled water and stir evenly, weigh 0.4g of sodium phosphate and add it to the sulfuric acid solution, and stir evenly until completely dissolved. Put the sides of the two beams with the slots facing outwards, and screw them slightly through the holes with the hexagonal screws, then place the two distance bolts between the two beams, the distance between th...

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Abstract

The invention relates to the technical field of grain size detection, in particular to a method for displaying the high-strength steel grain size. The method comprises the following steps of 1, assembling a stress guiding device, wherein a sample is machined into a beam of the corresponding specification, and then, the beam is assembled into the needed stress guiding device; 2, performing standingof a hydrogen inflation solution, wherein the assembled stress guiding device is placed into the hydrogen inflation solution for electrochemical hydrogen inflation, and standing is performed for 5 min-4 h; 3, measuring the grain size and evaluating the grain size level, wherein after the sample is broken, the sample is placed under a scanning electron microscope for magnifying and observing, thegrain size is measured, and the grain size level is evaluated. After the method is adopted, in the display process, a corrodent does not need to be found for grain boundary corrosion, in the grain boundary showing process, the grain size in steel cannot change, and the evaluating result is more accurate. Grain boundary corrosion is not involved, no grain size change is caused in the experiment process, and the high-strength steel grain size can be well evaluated.

Description

technical field [0001] The invention relates to the technical field of grain size detection, in particular to a method for displaying the grain size of high-strength steel. Background technique [0002] The grain size of steel is an important feature that marks the performance of steel. The grain size directly affects the physical and technological properties of steel at room temperature or even high temperature. Therefore, in the analysis of metal structure, the accurate evaluation of grain size is very important. In the previous evaluation of grain size, the grain boundary corrosion method was generally used. However, as the carbon content in the steel gradually increases, the corroded grain boundaries will become increasingly unclear, and even the corroded grain boundaries cannot be distinguished, so the grain size rating cannot be performed by the corrosion method. [0003] Grain size is a measure of the grain size of metal materials. The grain size significantly affec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02G01N1/28
CPCG01N1/28G01N15/02
Inventor 刘新宽盛荣生张年春
Owner 盛利维尔(常州)金属材料有限公司
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