Method for accurately measuring steel hydrogen evolution temperature range

Abstract

The invention relates to a method for accurately measuring the hydrogen evolution temperature range of steel materials, which is to uniformly heat the pretreated steel samples to the target temperature in an ultra-high vacuum state, the heating rate is 100-300 °C / h, and the target temperature is 800 °C ~850°C; during the uniform heating process, use a hydrogen analysis mass spectrometer to measure the change of the hydrogen evolution rate of the sample with temperature, and find out the temperature range corresponding to the fastest range of hydrogen evolution rate according to the change law of hydrogen evolution rate with temperature, which is the test The optimal hydrogen evolution temperature range of the sample. It solves the problem that the temperature range is difficult to set in the traditional hydrogen expansion process, and can solve the problem that the previous hydrogen measurement method has limitations on the sample requirements. It is a simple, fast, accurate, and environmentally friendly method for measuring the optimum temperature of hydrogen evolution, which fills the blank that cannot accurately measure the hydrogen evolution temperature range of steel materials.

Description

technical field [0001] The invention belongs to the technical field of iron and steel physical and chemical inspection, and in particular relates to a method for measuring the optimum temperature interval of hydrogen element precipitation in steel. Background technique [0002] As we all know, hydrogen is harmful in steel. Residual hydrogen in steel can cause defects such as white spots, fish eyes, bubbling, and hydrogen-induced cracks in steel materials, and eventually lead to brittle failure of materials. Therefore, the control of hydrogen in steel materials Particularly important. The traditional hydrogen evolution method is to heat the steel material to the hydrogen evolution temperature range, then keep it warm for a period of time and then cool it for hydrogen expansion. However, the hydrogen evolution temperature range is currently mainly set by the experience of technicians, and cannot be accurately determined. Even if the hydrogen determination instrument produced...

AI Technical Summary

Problems solved by technology

However, the hydrogen evolution temperature range is currently mainly set by the experience of technicians, and cannot be accurately determined

Even if the hydrogen determination instrument produced by LECO can only measure the total amount of hydrogen content in the steel material, it cannot give the actual trajectory of hydrogen precipitation in the steel, and the method of measuring the hydrogen content in the steel by using the hydrogen determination instrument has no effect on the test. The sample requirements are very high, and it can only adapt to samples of about 1g. This is also the measurement limitation of the hydrogen determination instrument.

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