Investigation of corrosion resistance of steels microalloyed by aluminum, titanium and nitrogen

Authors

Keywords:

atmospheric corrosion, 20АТYu type steel, corrosion rate, scanning electron microscope, energy dispersive X-ray analysis

Abstract

Purpose of the study. To determine the level of corrosion resistance of steel alloyed by titanium, aluminum and nitrogen (20АТЮ steel type) in the heat-strengthening state and to compare with the steels resistant to atmospheric corrosion, which are used as components of freight railway wagons (steel 09G2D). Methodology.  The tests of studied and the comparative steels for resistance to atmospheric corrosion were carried out according to GOST 9.909-86. Processing of the obtained results was carried out according to GOST 9.908-85. The mass loss of the samples during the time was adopted as a measure of corrosion resistance. Metallographic method for estimation of corrosion damages was carried out using an optical microscope «NEOPHOT - 32". During the study, the penetration depth indicator of corrosion layer was determined. Investigation of the microstructure and some typical local sites of corrosive lesions was carried out using a scanning electron microscope "Carl Zeiss". Chemical composition of typical structural components and corrosion products was determined by energy dispersive X-ray analysis using specialized equipment «TEAM ™ EDS Analysis System for SEM, EDAX». Results. During the study, was determined the rate of corrosion resistance of 20АТЮ type steel in the heat-strengthening state compared with the base carriage steel 09G2D in hot rolled condition. Scientific novelty. It was found that the steel, alloyed by aluminum, titanium and nitrogen, has a level of corrosion resistance, corresponding to the requirements of materials for car building. Practical significance. In Ukraine, according to The State Administration of Railway Transport of Ukraine, also known as "Ukrzaliznytsia", the average degree of wear railcars park is 86-89%. "Ukrzaliznytsia" has formulated the basic requirements for railcars of new generation. Without the use of new high-strength materials for parts railcars to meet these requirements is impossible. One of such promising materials, in our opinion, are high strength 20АТYu type steel. Strength and plastic properties of these steels has been studied previously and meet the requirements of the "Ukrzaliznytsia". However, corrosion properties of 20АТYu type steels has not been previously studied, so testing for resistance to atmospheric corrosion is very important.

Author Biographies

V. I. Bolshakov, State Higher Educational Establishment “Prydniprovs’ka State Academy of Civil Engineering and Architecture”

Department of Materials and Materials Processing, Dr. Sc. (Tech.), Prof., Chief of department

O. V. Uzlov, State Higher Educational Establishment “Prydniprovs’ka State Academy of Civil Engineering and Architecture”

Department of Materials and Materials Processing, Ph. D., Ass. Prof.

H. V. Drozhevska, State Higher Educational Establishment “Prydniprovs’ka State Academy of Civil Engineering and Architecture”

Department of Materials and Materials Processing, assistant

References

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Published

2016-06-12