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Method for calculating two-phase transformation volume ratio of metal material by measuring area

A technology of metal material and volume ratio, applied in the field of physical materials, can solve the problems of overlapping phase transition temperature ranges, increasing the error of calculation results, and being unable to apply

Active Publication Date: 2019-11-12
JIANGXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The volume fraction of each phase transformed during thermal simulation is usually calculated by the metallographic method and the leverage method, but both methods have certain limitations: the metallographic method has a wide range of applications, but it cannot be applied when the microstructure and morphology of the phases are very similar; The lever method has high calculation accuracy, but it cannot be applied when the phase transition temperature intervals of each phase transition overlap
But this method also has shortcomings: the operation process (especially the self-consistent operation process) is very cumbersome, which brings inconvenience to the operator and increases the error of the calculation result to a certain extent

Method used

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  • Method for calculating two-phase transformation volume ratio of metal material by measuring area
  • Method for calculating two-phase transformation volume ratio of metal material by measuring area
  • Method for calculating two-phase transformation volume ratio of metal material by measuring area

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A series of data of the thermal expansion of a weld metal material measured by Gleeble under the condition of a cooling rate of 12.5 ° C / s with temperature, in which the accuracy of the relative change of thermal expansion reaches 10 -6 mm with a temperature accuracy of 10 -2 ℃, temperature interval 10 -2 K. Organize the data by:

[0032] The first step: draw the thermal expansion curve, and perform leverage method processing on this curve to obtain the total phase change volume fraction data;

[0033] The second step: Differentiate the phase change volume fraction data, and draw the numerical differential curve of the phase change volume fraction;

[0034] Step 3: Make a horizontal straight line l through 0 on the numerical differential curve (mark the beginning and ending temperature T of the first phase on the straight line s and T f and the start and end temperature T′ of the second phase s and T' f ),Such as figure 1 As shown, measure the relative area S ...

Embodiment 2

[0038] A series of data on the thermal expansion of the material as a function of temperature under the condition of a cooling rate of 12.5°C / s measured by Gleeble, where the thermal expansion accuracy reaches 10 -6 mm with a temperature accuracy of 10 -2 ℃. By sorting out the data accordingly, the obtained numerical differential curve of the volume fraction corresponding to the temperature change is as follows: figure 2 shown. figure 2 It shows two troughs, corresponding to the phase transition process of the two phases, and the thermal expansion value differential curve AA' between the two troughs is partially contributed by the overlapping phase transition process.

[0039] Step 1: Draw a horizontal line l corresponding to 0 on the graph, and mark the starting point T of the first wave on the horizontal line l s with the end point T′ of the second wave f , which correspond to the temperature at which the first phase transition begins and the temperature at which the s...

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Abstract

The invention belongs to the field of physical materials, and particularly relates to a method for calculating a two-phase transformation volume fraction through numerical differentiation on the basisof a lever method. The method comprises the following steps: determining the data of the thermal expansion amount of the material along with the temperature change in the two-phase transformation process, exporting a numerical differential curve of the phase change volume fraction along with the temperature change by adopting a lever method, and calculating the volume fraction of the two-phase transformation by processing the numerical differential curve. The method can solve the calculation problem of the phase volume fraction when the phase transition temperature intervals are not overlapped or partially overlapped, the calculation principle of the method is different from the calculation principle of a previous method, the calculation operation process (especially the self-consistent operation process) is simple, and the calculation result of the method is theoretically more accurate than that of the previous method. The method can be extended to accurately calculate the volume fraction of each phase during three-phase or multi-phase transition of the material.

Description

technical field [0001] The invention belongs to the field of physical materials, and in particular relates to a method for calculating the volume ratio of two-phase transformation through numerical differentiation on the basis of a lever method. Background technique [0002] Thermal simulation is one of the common methods of materials research (Reference 1: M.Shome, O.P.Gupta, O.N.Mohanty, Scripta Materialia, 2004, 50:1007 and Reference 2: J.B.Ju, W.Kim, J.Jang, Materials Science and Engineering: A, 2012, 546:258). The thermal expansion data collected during thermal simulation has very important reference value for analyzing the phase transition characteristics and process of materials. The thermal expansion data collected during thermal simulation can be used to determine the phase transition temperature of materials, characterize the phase transition kinetics of materials, calculate the multiphase phase transition volume fraction of materials, and so on. Due to the diffe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06F17/13
CPCG06F17/13
Inventor 雷玄威杨荣玻黄双双肖琳琳丁佳俊
Owner JIANGXI UNIV OF SCI & TECH
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