Standard sample used for detecting specific thermal deflection property and its preparation method

Abstract

The invention relates to a standard sample used for detecting specific thermal deflection property and its preparation method. Selecting thermal bimetals as the materials, the standard sample comprises the following components by weight percent: a high expansion layer composed of 21.5-24.0 of Ni; 2.5-5.0 of Cr; 0.40-0.70 of Mn; 0.20-0.35 of Si; 0.30-0.40 of C; less than or equal to 0.02 of P; less than or equal to 0.02 of S; and a low expansion layer composed of 36.0-38.0 of Ni; less than 0.50 of Mn; less than 0.25 of Si; less than or equal to 0.05 of C; less than or equal to 0.02 of P; and less than or equal to 0.02 of S. The preparation method includes: employing a vacuum induction furnace process to smelt thermal bimetals, then casting them into an ingot, and conducting a homogeneity test; taking the central part of the ingot to perform forging and hot rolling into a bar of certain specification, then carrying out cold drawing on the bar to obtain a finished bar with certain diameter; taking a representative part from the finished bar along the rolling direction; performing finish machining to obtain the standard sample. The standard sample provided in the invention and a thermal bimetal detection device can be used together for determining the specific thermal deflection property of thermal bimetals, can effectively guarantee instrument calibration and data comparison, thus greatly improving the accuracy of evaluation test and measurement precision, and guaranteeing effective supervision of product quality.

Description

technical field [0001] The invention relates to a standard sample for testing the physical properties of metal materials and a preparation method thereof, in particular to a standard sample for testing the specific bending performance and a preparation method thereof. Background technique [0002] Specific bending is a measure of temperature and heat sensitivity, and it is the most basic and important characteristic parameter in the bending characteristics of thermal bimetallic materials when the temperature changes. [0003] The specific bending performance is an important index to measure the temperature sensitivity of thermal bimetals, and it is also one of the most important properties of thermal bimetals. [0004] Thermal bimetal is a composite material composed of two or more layers of metals or alloys with different expansion coefficients firmly bonded to each other along the entire contact surface. [0005] When the thermal bimetal is heated, due to the different th...

AI Technical Summary

Problems solved by technology

[0007] At present, in thermal bimetal performance testing, there is no standard sample for specific bending. Therefore, the detection technology of thermal bimetal specific bending performance has the following problems: without standard samples, the testing equipment cannot be calibrated, and the normal operation of testing equipment Affected; in the thermal bimetal specific bending performance testing process, there is no reliable basis for data comparison, the accuracy of the testing process is affected, and the effective supervision of measurement accuracy and product quality cannot be guaranteed

[0010] However, so far, there has been no comparison bending standard sample, which has brought certain difficulties to the calibration of instruments, comparison of data, and ensuring the accuracy of measurement in laboratory testing.

In summary, the measurement accuracy of specific bending performance detection technology is a technical problem in the field of thermal bimetal measurement

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