An analytical method for spontaneous combustion testing and oxygen-enriched corrosion of ferrous materials

Abstract

The invention discloses an analysis method used for spontaneous combustion test and oxygen-enriched erosion of a steel material, and belongs to the field of detection and analysis of the steel material performance. When the spontaneous combustion test is performed, a test sample is processed into a rod material with a tapered end, is fixedly arranged in an atmosphere oven, and is heated to temperature of 700-900 DEG C; an oxygen gas valve is opened, and mutation is displayed through an infrared detector, and an oxygen pressure threshold value of spontaneous combustion at the temperature of the test sample is determined; during an oxygen-enriched erosion test, the test sample is processed into square pieces and is put into a small quartz boat, and the test sample is sleeved with a layer of sleeve; then, the test sample is put into the atmosphere oven, weight change, under different temperatures and oxygen pressure, of the test sample are tested, and morphology and component analysis is performed on an oxidation layer. During the spontaneous combustion test, a fire accelerant is not added, so that influences, on combustion performances, of the fire accelerant are avoided; a high-temperature oxygen-enriched erosion test can reflect an oxygen erosion condition, during a service period, of a workpiece prepared by a steel material more truly, and therefore, a novel method is provided for damage analysis of the workpiece and service life prediction.

Description

technical field [0001] The invention belongs to the field of performance detection and analysis of iron and steel materials, and in particular relates to an analysis method for the spontaneous combustion test and oxygen-enriched corrosion of iron and steel materials. Background technique [0002] Most space rocket engines in the United States use liquid hydrogen and liquid oxygen as fuel. Since the 1970s, there have been many cases of rocket and space shuttle engine explosions in the United States. Because this problem directly affects the safety and reliability of rocket engines, the United States and the former Soviet Union attach great importance to scientific research in this field, and units such as NASA and Kennedy Space Center have invested a lot of manpower He Wuli has conducted a series of exploratory research in this field. [0003] The United States has conducted systematic research on metal combustion, and ASTM has formulated relevant standards. There are severa...

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Problems solved by technology

[0015] Atmospheric liquid oxygen (LOX) mechanical shock test can only qualitatively measure the ease of combustion of different materials, but cannot qualitatively characterize the combustion performance with physical quantities; high-pressure gaseous oxygen (GOX) mechanical shock test can observe the process more carefully. However, it is still impossible to measure qualitatively; the high-pressure oxygen-enriched ignition experiment can qualitatively measure the combustion critical pressure, but the measurement process is relatively cumbersome. It can be seen from the triangle of metal combustion elements that there are many factors that affect combustion. Under the condition of non-combustion for 5 consecutive times, as the critical pressure for the material to burn under this pressure, the experimental results obtained by this standard are relatively rough, which may cause the experimental results to be small. In addition, due to the addition of igniters in this experiment, and An influencing factor is introduced, which cannot truly reflect the combustion and ignition process; the friction ignition experiment can only reflect the combustion performance through the indirect physical quantity Pv value, and the surface roughness of the experimental sample has a great influence on the Pv value

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