Method for measuring dissolving and precipitating temperatures of precipitated phase in steel and iron material

A technology of precipitation temperature and iron and steel materials, applied in the field of precipitation temperature and measuring the dissolution of precipitation phase in iron and steel materials, can solve the problems of complicated testing process and no experimental measurement method that can give precipitation phase precipitation and dissolution temperature, etc. The measurement method is simple, the test method is simple, and the temperature accuracy of the test is high.

Active Publication Date: 2012-03-14
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The thermodynamic simulation calculation is based on the thermodynamic empirical formula to deduce the precipitation and dissolution temperature of the precipitated phase, but the results generally have a certain gap with the real results
[0009] In summary, there is no experimental measurement method that can give the precipitation and dissolution temperature of the precipitated phase under stress-free loading.
Moreover, the testing process of existing experimental methods is also very complicated.

Method used

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  • Method for measuring dissolving and precipitating temperatures of precipitated phase in steel and iron material
  • Method for measuring dissolving and precipitating temperatures of precipitated phase in steel and iron material
  • Method for measuring dissolving and precipitating temperatures of precipitated phase in steel and iron material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 AlN and VC precipitation, measurement of dissolution temperature

[0029] (1) Sampling: Take 80mg of a certain steel with Al, V, N added. The steel composition is shown in the table below:

[0030] C

Si

mn

P

S

Al

V

Ti

N

0.161

0.41

1.45

0.011

0.0039

0.041

0.05

0.004

0.0036

[0031] Grind the surface of the sample with sandpaper to remove iron oxide scale, then ultrasonically clean it with alcohol solution for 2 minutes, and wait for the sample to dry before use.

[0032] (2) Calorimetric scanner test and draw curve:

[0033] Temperature measuring range: 30~1300°C; heating and cooling rate: 10°C / min. After the test, the temperature-heat change curve is as follows: figure 1 shown. From figure 1 It can be roughly seen that a reaction occurs at 748.4°C during the heating process. During the cooling process, reactions occurred at 896.5°C, 821°C...

Embodiment 2

[0040] The precipitation temperature measurement of embodiment 2TiC

[0041] (1) Sampling: Take 18 mg of a steel with Ti and N added. The steel composition is shown in the table below:

[0042] C

Si

mn

P

S

Ti

Al

N

0.12

1.36

1.85

0.009

0.005

0.15

0.053

0.0048

[0043] Grind the surface of the sample with sandpaper to remove iron oxide scale, then ultrasonically clean it with alcohol solution for 2 minutes, and wait for the sample to dry before use.

[0044] (2) Calorimetric scanner test and draw curve:

[0045]Temperature measurement range: 30-1300°C; heating rate: 20°C / min, cooling rate: 10°C / min. Only the data of the cooling section is measured. After the test, the temperature-calorie change curve and its primary differential results are as follows: Figure 6 shown. From Figure 6 It can be seen from the figure that obvious reactions occurred at 1118°C, 903-905°C, 8...

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Abstract

The invention discloses a method for measuring the dissolving and precipitating temperatures of a precipitated phase in a steel and iron material, belonging to the technical field of metal material detection. According to the adopted technical scheme, the precipitating temperature and the dissolving temperature are measured by using the variation of accompanying absorbed or discharged heat in theprecipitating and dissolving processes. The method has the advantage: the dissolving and precipitating temperatures of the precipitated phase in the heating or cooling process can be accurately measured, so that reference data is provided for the control over the material machining process. The measuring method is easy and convenient, and has high temperature testing accuracy.

Description

technical field [0001] The invention belongs to the technical field of metal material detection, in particular to a method for measuring the dissolution and precipitation temperature of precipitated phases in iron and steel materials. technical background [0002] Adding a small amount of alloying elements in the steel, and obtaining ultra-fine structures by adopting a suitable process can greatly improve the performance of the steel material. The main microalloying elements Nb, Ti, V, etc. all achieve grain refinement and precipitation strengthening by forming carbonitrides. Therefore, the precipitation and dissolution temperature measurement of carbonitrides of these microalloying elements in steel is the key to the control of precipitates. [0003] At present, the main research methods of precipitated phases in steel include: (1) physical and chemical phase analysis; (2) electrical resistance measurement; (3) electron microscopy; (4) mechanical (stress, strain measuremen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20G01N25/48G01N25/12
Inventor 蔡宁鞠新华史学星孟杨严春莲
Owner SHOUGANG CORPORATION
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