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Spring steel austenite grain size detection method

A technology for austenite grains and detection methods, applied to measuring devices, material analysis using wave/particle radiation, instruments, etc., can solve problems such as unsatisfactory results, achieve simple and easy access to raw materials and equipment, and high measurement accuracy , a wide range of effects

Active Publication Date: 2022-07-26
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the existing detection technology mostly uses ferrite mesh method and oxidation method to detect the austenite grain size of spring steel 55SiCrA, 60Si2MnA, etc., but the effect is not ideal.

Method used

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  • Spring steel austenite grain size detection method
  • Spring steel austenite grain size detection method
  • Spring steel austenite grain size detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The tested spring steel grades are listed in Table 1. The detection steps include:

[0023] (1) Take a spring steel wire rod with a length of 200 mm and straighten it;

[0024] (2) Put the wire rod into a heating furnace at 860℃ for 60min, put it into fast-flowing water for quenching to obtain a complete martensitic structure, and cut a 1-2mm deep crack in the middle of the heat-treated sample for use;

[0025] (3) The cotton soaked in 15% dilute sulfuric acid solution is taken out and placed on the grid until no dilute sulfuric acid solution drips; Seal the package with tape, remove the tape and cotton after 24 hours, wash the sample with alcohol and blow dry; tap the opposite side of the sample crack with a hammer, and the sample will break along the crack. Quickly ultrasonically clean the fracture with alcohol, and dry it immediately after cleaning;

[0026] (4) Observe the fracture with the secondary electron image of the scanning electron microscope. The inspec...

Embodiment 2

[0034] The tested spring steel grades are listed in Table 1. The detection steps include:

[0035] The detection steps include:

[0036] (1) Take a spring steel wire rod with a length of 180 mm and straighten it;

[0037] (2) Put the wire rod into a heating furnace at 860℃ for 60min, put it into fast-flowing water for quenching to obtain a complete martensitic structure, and cut a 1-2mm deep crack in the middle of the heat-treated sample for use;

[0038] (3) The cotton soaked in 15% dilute sulfuric acid solution is taken out and placed on the grid until no dilute sulfuric acid solution drips; Seal the package with tape, remove the tape and cotton after 28 hours, wash the sample with alcohol and blow dry; tap the opposite side of the crack of the sample lightly with a hammer, and the sample will break along the crack. Quickly ultrasonically clean the fracture with alcohol, and dry it immediately after cleaning;

[0039] (4) Observe the fracture with the secondary electron ...

example 2

[0041] The tested spring steel grades are listed in Table 1. The detection steps include:

[0042] (1) Take a spring steel wire rod with a length of 180 mm and straighten it;

[0043] (2) Put the wire rod into a heating furnace at 860℃ for 60min, put it into fast-flowing water for quenching to obtain a complete martensitic structure, and cut a 1-2mm deep crack in the middle of the heat-treated sample for use;

[0044] (3) Load the opposite side of the crack of the sample with impact load, so that the sample breaks along the crack, quickly clean the fracture with alcohol by ultrasonic wave, and dry it immediately after cleaning;

[0045] (4) Observe the fractures with the secondary electron image of the scanning electron microscope, and it can be found that most of the fractures are intergranular fractures, and the grain boundary recognition rate is about 65%. In the method of 8.3.2 straight line intercept point, on the fracture picture, several straight lines are used to for...

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Abstract

The method for detecting austenite grain size of spring steel includes the following process steps: (1) Sampling: take a spring steel wire rod sample with a length of 150~200mm; (2) Heat treatment: heat the sample in an environment of 860±10°C and keep the temperature After 55~65min, put it into fast-flowing water for quenching to obtain a complete martensite structure; (3) Sample preparation: cut a 1~2mm deep crack in the middle of the heat-treated sample, soak it with dilute sulfuric acid solution After 24~30 hours of passing cotton wrapped in the crack, the sample is knocked off along the crack to form a fracture; (4) Detection: observe the fracture with a scanning electron microscope, identify the grain boundary, and use the straight line intercept method to determine the grain. Spend. In the present invention, the directly quenched sample is prepared by the fracture method and then infiltrated with hydrogen to form the intergranular fracture section, the intergranular morphology is observed by scanning electron microscope, and the grain size information is obtained by software and the intercept method.

Description

technical field [0001] The invention belongs to the technical field of metal material detection, and relates to a method for detecting austenite grain size of spring steel. [0002] technical background [0003] The austenite grain size in steel has an important influence on its physical, mechanical properties and heat treatment, so it is of great significance to accurately evaluate the austenite grain size in steel. There are many methods for evaluating the size of austenite grains. For spring steel, direct hardening method, oxidation method, EBSD method and fracture method are generally used. [0004] To detect the austenite grain size of spring steel, the corrosion effect of the direct hardening method is generally unsatisfactory, the grain boundary recognition rate is low, and it is easily affected by the composition of the corrosive agent, corrosion time, temperature, etc., and it is difficult to control; the oxidation method is Using the thin oxide layer formed on the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/2202G01N23/2251
CPCG01N23/2202G01N23/2251
Inventor 袁桥军邢耀进杜江汪贺模杨小军郭泽尧
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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