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Solid section temperature variation determination method

A measurement method and cross-section technology, applied in the field of temperature change measurement, can solve problems such as the limitation of the accuracy of calculation results, and achieve the effect of simple calculation process and reduced calculation accuracy.

Inactive Publication Date: 2013-12-11
SHANDONG JIANZHU UNIV
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Problems solved by technology

However, the accuracy of the calculation results will also be restricted by whether the described heat transfer problem is comprehensive and accurate and some other factors

Method used

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Embodiment Construction

[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0048] see figure 1 with figure 2 , the modified Fourier non-steady-state heat conduction differential equation with the first kind of boundary condition, that is, the analytical solution of the heat conduction differential equation when the surface temperature changes at a constant speed. When heating or cooling at a constant rate, after a certain period of time, the temperature from the center to the surface of the solid changes at the same speed, so that the temperature difference between the surface and the center remains constant.

[0049] When the surface temperature of solid materials of different shapes changes at a constant speed, the solution of the Fourier heat conduction differential equation is as follows:

[0050] 1.1 Infinity Tablet

[0051] t = t s ...

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Abstract

The invention discloses a solid section temperature variation determination method, which is characterized by comprising the following steps: 1, measuring a change curve of surface temperatures of a solid along with time in a known environment by a determinator, and fitting the measuring curve to a continuous curve to avoid breakpoints during measuring; 2, carrying out differentiation on the fitted measuring curve to obtain a cooling velocity curve; 3, calculating a temperature-time curve of a random location of the measured section of the solid; 4, calculating the start point of a cooling curve of the random location on the measured section; 5, calculating all points at the temperature interval delta ti; 6, superposing overcooling austenite continuous isothermal cooling transition curves of steel and iron materials; and 7, calculating the depth of a through hardening layer. The solid section temperature variation determination method simplifies a complex calculation process without reducing the calculation accuracy, and achieves the purpose of practicability.

Description

technical field [0001] The invention relates to the technical field of temperature change measurement, in particular to a method for measuring temperature change of a solid section. Background technique [0002] The research methods of heat transfer problems can be roughly divided into two categories: theoretical research methods and experimental research methods. Theoretical research methods can be divided into mathematical analysis methods and numerical calculation solutions. [0003] The numerical calculation solution is to write the differential equation or integral equation describing the heat transfer problem into some algebraic equations that can be calculated by the computer through mathematical means, and use a suitable algorithm to calculate relatively accurate results by computer. However, the accuracy of the calculation results will also be restricted by whether the described heat transfer problem is comprehensive and accurate, as well as some other factors. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20C21D1/18
Inventor 王献忠徐勇孙德明张保议王志刚李永胜吴俊平
Owner SHANDONG JIANZHU UNIV
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