Measurement method for calculating two-phase transition ratio by thermal expansion curve

Abstract

The invention discloses a measurement method for calculating a two-phase transition ratio by a thermal expansion curve. The measurement method avoids artificial subjective factor-caused influence on a tangent position and a tangent point position and especially avoids influence on a tangent point position so that the measured phase-transition temperature and the calculated two-phase transition ratio are closer to actual values. A series of measured material thermal expansion amount data changed along with temperature change before and after phase transition is subjected to data transition and differential calculation is carried out according to the thermal expansion curve so that key phase transition temperature data such as an initial temperature and an end temperature of two phase transition and thermal expansion curve slope data is determined accurately, wherein the thermal expansion curve slope data comprises thermal expansion curve slopes before and after phase transition, and the two-phase ratio is calculated by the determinated data and a phase ratio lever rule so that two-phase transition accuracy is improved.

Description

technical field [0001] The invention relates to a measuring method for calculating the two-phase transformation ratio by using a thermal expansion curve, which belongs to the field of metal phase transformation measurement. Background technique [0002] The organization of materials is one of the key factors affecting the properties of materials, and the phase transition process of materials is an important link in determining the final organization type of materials. The transformation temperature range of different phase change structures is different, and will show different mechanical properties on the macroscopic scale. The determination of the proportion of phase change structures can provide a reference for the prediction of mechanical properties on the one hand, and enrich the mechanical properties on the other hand. The quantitative relationship with the tissue ratio provides more data references for the development of materials. [0003] The thermal simulation met...

AI Technical Summary

Problems solved by technology

It can be seen that the "tangent line method" is theoretically the closest to the metallurgical principle, but the position of the tangent line and the position of the tangent point are easily affected by the subjective factors of the observer, especially the position of the tangent point, which varies from person to person. The determined phase transition temperature can differ by 30-40°C, which will have a greater impact on the accurate calculation of the later phase transition ratio

Images