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A method for detecting dislocation density in ultra-low carbon steel by snoek relaxation internal friction peak method

A technology of ultra-low carbon steel and internal friction, applied in the field of physical performance testing of metal materials, can solve problems such as difficult sample preparation, cumbersome data processing, and stability impact

Active Publication Date: 2018-07-13
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The test sensitivity is high, but the radiation damage to the sample is large
[0008] 5-field ion microscope and 3D atom probe: sensitive to detect dislocation density, but difficult to prepare samples, and the detection results are highly localized
X-ray diffraction technology is seriously affected by the stability of the instrument, the measurement data is unstable, the operation error is large and the data processing is cumbersome
Transmission electron microscope microscopy, positron flooding technique, field ion microscope and three-dimensional atom probe are not suitable for evaluating the average dislocation density, and the requirements for sample preparation are high

Method used

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  • A method for detecting dislocation density in ultra-low carbon steel by snoek relaxation internal friction peak method
  • A method for detecting dislocation density in ultra-low carbon steel by snoek relaxation internal friction peak method
  • A method for detecting dislocation density in ultra-low carbon steel by snoek relaxation internal friction peak method

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Experimental program
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Effect test

Embodiment 1

[0067] In this example, see Figure 1 to Figure 4 , a method for detecting the dislocation density of ultra-low carbon steel using the Snoek relaxation internal friction peak method, comprising the steps of:

[0068] a. Detect the carbon content of ultra-low carbon steel: take ultra-low carbon steel samples, calculate the carbon atomic percentage C (at%) of ultra-low carbon steel samples, and record the ultra-low carbon steel cold working deformation to the test of internal friction The time t(s) at room temperature;

[0069] b. Make the Snoek relaxation internal friction test sample: cut and make a rod-shaped metal sample with a sample size of 1*2*55mm from the ultra-low carbon steel sample taken in the step a, and carry out the follow-up Before the test, use an ultrasonic cleaner to clean the rod-shaped metal sample, so that the surface of the rod-shaped metal sample is clean and pollution-free, and use the cleaned and treated rod-shaped metal sample as the sample to be tes...

Embodiment 2

[0084] This embodiment is basically the same as Embodiment 1, especially in that:

[0085] In this example, see Figure 5 ~ Figure 7 , when using the Snoek relaxation internal friction peak method to detect the dislocation density of ultra-low carbon steel, the ultra-low carbon steel sample is detected by the sulfur and nitrogen combustion instrument, and the carbon atomic percentage is 4.67×10 -3 % of ultra-low carbon steel, the time t at room temperature between cold working deformation and internal friction measurement is three months (324000s). The deformation of the sample is 5%. The internal friction test sample is a 1*2*55mm rod-shaped sample. The surface is roughly ground and polished, and the internal friction test is carried out by ultrasonic cleaning. see Figure 5 , the true Snoek relaxation internal friction peak peak temperature of the sample with 5% deformation is 320K, and the real peak height of the Snoek relaxation internal friction peak is 4.90×10 -4 , th...

Embodiment 3

[0087] This embodiment is basically the same as the previous embodiment, and the special features are:

[0088] In this example, see Figure 8 ~ Figure 10 , when using the Snoek relaxation internal friction peak method to detect the dislocation density of ultra-low carbon steel, the ultra-low carbon steel sample is detected by the sulfur and nitrogen combustion instrument, and the carbon atomic percentage is 4.67×10 -3 % of ultra-low carbon steel, the time t at room temperature between cold working deformation and internal friction measurement is three months (324000s). The deformation of the sample is 10%. The internal friction test sample is a 1*2*55mm rod-shaped sample. The surface is roughly ground and polished, and the internal friction test is carried out by ultrasonic cleaning. see Figure 8 , when the deformation amount is 10%, the peak temperature of the real Snoek relaxation internal friction peak of ultra-low carbon steel is 313K, and the peak height is 4.90×10 -...

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Abstract

The invention discloses a method for detecting the dislocation density of ultra-low carbon steel with a Snoek relaxation internal friction peak method. By means of a Snoek relaxation internal friction peak, peak height and peak temperature of the Snoek relaxation internal friction peak are analyzed, so that the dislocation density of the ultra-low carbon steel is evaluated; with the adoption of the method for detecting the dislocation density of the ultra-low carbon steel, the detection sensitivity is high, the dislocation density of the ultra-low carbon steel can be accurately detected, and the method is particularly suitable for detecting the dislocation density of the ultra-low carbon steel in different deformation quantities; sample preparation and operation are simple, and the method has wide application prospect; with the application of Snoek relaxation internal friction peak for detection of the dislocation density, the sample preparation is simple, and the operation is also simple, easy and convenient.

Description

technical field [0001] The invention relates to a method for measuring the plastic deformation performance of ultra-low carbon steel, in particular to a method for detecting the dislocation density of ultra-low carbon steel, which is applied in the technical field of metal material physical property detection. Background technique [0002] With the advancement of metallurgical technology and the development of the automobile industry, ultra-low carbon steel with excellent deep drawing properties has been widely used in the automobile industry and electronic component industry, allowing workpieces with complex shapes to be punched, and products without lugs or lugs Small, less material loss. Generally, those with a carbon content of less than 300ppm are called ultra-low carbon steels, and those with a carbon content of less than 100ppm are called ultra-micro carbon steels. The deep drawing performance is characterized by the average plastic strain ratio of the plastic strain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/20
CPCG01N33/20
Inventor 汪宏斌祝玲娟江文俊胡震宇陈卓
Owner SHANGHAI UNIV
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