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
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[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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