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Method for measuring solution and precipitation temperatures of precipitated phase in steel by adopting dilation method

A technology of iron and steel materials and precipitation temperature, which is applied in the field of measurement of precipitation phase dissolution, dissolution, precipitation temperature and precipitation temperature in steel materials by expansion method

Inactive Publication Date: 2012-10-10
SHOUGANG CORPORATION
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  • Summary
  • 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

Method used

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  • Method for measuring solution and precipitation temperatures of precipitated phase in steel by adopting dilation method
  • Method for measuring solution and precipitation temperatures of precipitated phase in steel by adopting dilation method
  • Method for measuring solution and precipitation temperatures of precipitated phase in steel by adopting dilation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The measurement of embodiment 1 VC melting temperature

[0037] Sampling: Take a certain V-added steel and process it into a round bar of Ф4mm×25mm. The steel composition is shown in the table below:

[0038]

[0039] Ultrasonic cleaning with alcohol solution for 2 minutes, and wait for the sample to dry before use.

[0040] (2) Measure the expansion coefficient and draw the curve:

[0041] Temperature measuring range: 30~1000°C; heating and cooling rate: 5°C / min. Argon protective atmosphere. Temperature in the heating process - expansion (dL / L 0 ) change curve and its primary differential results such as figure 1 shown. The solid line is the expansion-temperature curve, and the dotted line is the first differential result. The temperature at each transition point has been marked in figure 1 middle.

[0042] (3) Data analysis

[0043] from figure 1From the primary differential curve, it can be seen that there is a weak volume change process at 626-698°C du...

Embodiment 2

[0048] Embodiment 2 TiC precipitation temperature measurement

[0049] (1) Sampling: Take a Ti-added steel and process it into a round bar of Ф4mm×25mm. The steel composition is shown in the table below:

[0050]

[0051] Ultrasonic cleaning with alcohol solution for 2 minutes, and wait for the sample to dry before use.

[0052] (2) Dilatometer test and draw the curve:

[0053] Temperature measuring range: 30~1300°C; heating and cooling rate: 3°C / min. Only the cooling process is studied here, the temperature-expansion (dL / L0) change curve and its first differential results are as follows: Image 6 shown. The temperature at each transition point has been marked in Image 6 middle.

[0054] (3) Data analysis:

[0055] Judging from the iron-carbon phase diagram, austenite begins to transform into ferrite at 797.5°C. The transformation reaction of austenite at 749.5~739.5℃ is affected by another reaction process. The transformation from austenite to pearlite begins at ...

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Abstract

A method for measuring solution and precipitation temperatures of a precipitated phase in steel by adopting a dilation method and belongs to the technical field of detection of metal materials. The technical scheme is that the temperature variation along with the dilation quantity in the temperature increment and reduction processes are tested through a dilatometer by utilizing the volume change in the precipitation and solution processes, and then a primary differential curve is calculated to determine the solution and precipitation temperatures of the precipitated phase. The invention has the advantages that the solution and precipitation temperatures of the precipitated phase can be accurately measured, and further, references are provided for controlling the material processing technology. The measurement method is simple and convenient and the tested temperatures are high in precision.

Description

technical field [0001] The invention relates to the technical field of metal material inspection, in particular to a method for measuring the dissolution and precipitation temperature of precipitated phases in iron and steel materials by dilation, which is suitable for measuring the dissolution and precipitation temperature of precipitated phases in microalloys and alloy steels. 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: ...

Claims

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Application Information

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IPC IPC(8): G01N25/16
Inventor 蔡宁鞠新华史学星严春莲孟扬
Owner SHOUGANG CORPORATION
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