Testing method for measuring DSC curve of phase change point of metal material

A technology of metal materials and testing methods, applied in the investigation stage/state change and other directions, can solve the problems of inaccurate conclusions, many absorption/exothermic peaks in DSC curves, and difficult to judge, etc., to achieve accurate data and significant phase transition peaks. Effect

Inactive Publication Date: 2015-03-04
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual test, due to the strain energy and defects of the sample itself, the performance of the sample itself is unstable, so that the obtained DSC curve has many and mixed absorption/exothermic peaks, and it is difficult to judge which are the phase transition peaks. As a result, the conclusions drawn from

Method used

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  • Testing method for measuring DSC curve of phase change point of metal material
  • Testing method for measuring DSC curve of phase change point of metal material
  • Testing method for measuring DSC curve of phase change point of metal material

Examples

Experimental program
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Example Embodiment

[0033] Example 1

[0034] 1. Example ingredients

[0035] A certain steel grade is selected in the embodiment, and its chemical composition is shown in Table 1.

[0036] Table 1 Example chemical composition (wt.%)

[0037]

[0038] 2. Experimental process of the embodiment

[0039] 1) The sample is annealed, the annealing time is 900℃, and the annealing time is (1-1.2)*0.7min;

[0040] 2) The surface of the sample is pre-ground with 1200# or above precision sandpaper;

[0041] 3) Fine grinding the sample to make the thickness of the sample 0.7mm and the mass 107.7mg;

[0042] 4) The sample is heated from room temperature and heated to 930°C, and the heating rate is set to 5K / min. The DSC data curve during the collection process is automatically collected by the thermal analyzer;

[0043] 5) Make the tangent line by extrapolating the initial baseline and the terminating quasi-baseline on the DSC curve. The intersection point of the tangent line at the initial baseline and the DSC curve is th...

Example Embodiment

[0049] Example 2

[0050] 1. The embodiment selects a certain steel grade, and its chemical composition is shown in Table 3.

[0051] Table 3 Example chemical composition (wt.%)

[0052]

[0053]

[0054] 2. Experimental process of the embodiment

[0055] 1) The sample is annealed, the annealing time is 950℃, and the annealing time is (1-1.2)*1.4min;

[0056] 2) The surface of the sample is pre-ground with 1500# or higher precision sandpaper;

[0057] 3) Perform fine grinding on the sample so that the thickness of the sample is controlled to 1.4mm and the mass is 120.5mg;

[0058] 4) The sample is heated from room temperature and heated to 930°C, and the heating rate is set to 10K / min. The DSC data curve in the process is collected, and the DSC data curve in the process is automatically collected by a thermal analyzer;

[0059] 5) Make the tangent line by extrapolating the initial baseline and the terminating quasi-baseline on the DSC curve. The intersection point of the tangent line at th...

Example Embodiment

[0065] Example 3

[0066] 1. The embodiment selects a certain steel grade, and its chemical composition is shown in Table 5.

[0067] Table 5 Example chemical composition (wt.%)

[0068]

[0069] 2. Experimental process of the embodiment

[0070] 1) The sample is annealed, the annealing time is 930℃, and the annealing time is (1-1.2)*1.1min;

[0071] 2) The surface of the sample is pre-grinded with 2000# or above precision sandpaper;

[0072] 3) Fine grinding the sample to make the thickness of the sample 1.1mm and the mass 108.9mg;

[0073] 4) The sample is heated from room temperature and heated to 930°C, and the heating rate is set to 10K / min. The DSC data curve in the process is collected, and the DSC data curve in the process is automatically collected by a thermal analyzer;

[0074] 5) Make the tangent line by extrapolating the initial baseline and the terminating quasi-baseline on the DSC curve. The intersection point of the tangent line at the initial baseline and the DSC curve is ...

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Abstract

The invention relates to a testing method for measuring a DSC curve of a phase change point of a metal material, belonging to the field of physical tests of the metal material. The testing method comprises the following steps: selecting a sample and carrying out an experiment test. In the step of selecting the sample, a test steel sample is selected before the step of carrying out the experiment test; annealing treatment is carried out on the selected sample; the annealed sample is subjected to surface treatment; after the sample is treated, the treated sample is subjected to the experiment test; in the experiment test process, the sample is heated from a room temperature and a temperature rising speed is set to be 5K/min-10K/min; and a DSC data curve in the process is automatically collected by using a thermal analyzer; and a phase change peak is accurately identified from the collected DSC curve. According to the testing method for measuring the DSC curve of the phase change point of the metal material, the annealing treatment is carried out on the sample before the test, and DSC curve impure peaks caused by strain energy and defects are basically eliminated; and the phase change peak is remarkable and the obtained phase change point data are accurate.

Description

technical field [0001] The invention relates to a DSC curve test method for measuring the phase transition point of metal materials, belonging to the field of physical testing of metal materials. Background technique [0002] Differential scanning calorimetry (DSC) as a quality detection method can determine a variety of thermodynamic and kinetic parameters, such as specific heat capacity, enthalpy change, heat of reaction, phase diagram, reaction rate, crystallization rate, polymer crystallinity, and sample linearity. The main principle of using the DSC curve to measure the phase transition of metal materials is to use the different absorption / exothermic processes of the collected samples to obtain the DSC curve when the heating rate is constant. It is the relationship between the difference of thermal power and temperature T, and then data analysis is performed through the obtained DSC curves to determine the phase transition point. However, in the actual test, due to the...

Claims

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Application Information

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IPC IPC(8): G01N25/12
Inventor 陈远姝郭志春范益
Owner NANJING IRON & STEEL CO LTD
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