| Autor: |
H. A. Kononenko, O. A. Shpak, R. V. Podolskyi, O. I. Babachenko |
| Jazyk: |
angličtina |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
Vìsnik Pridnìprovsʹkoï Deržavnoï Akademìï Budìvnictva ta Arhìtekturi, Vol 1, Iss 2, Pp 16-20 (2019) |
| ISSN: |
2312-2676 |
| Popis: |
Problem statement. The development of the chemical composition of steels for railway wheels, which increases their life in various operating conditions. Methods. Ingots of small volume (up to 10 kg) with a diameter of 80 mm with a high content of manganese and silicon (steel “K”), as well as with the Al−Ti−N system based on the steel grade “2” (DSTU GOST 10791-2016) and steel "K" were melted in induction furnace under laboratory conditions. The carbon content in the experimental steels was up to 0.6 % of the mass. Melting of the steel "T" was comparative in these studies and in its chemical composition corresponds to the requirements of DSTU GOST 10791-2016. All meltings were made under the same conditions. Steel hardenability was determined by Jeminy test according to GOST 5657. Results. Ways of increasing the operational durability of railway wheels are investigated. Alloying systems aredeveloped with a fundamentally new method of steel hardening for railway wheels − a refractory dispersed phase together with solid solution hardening. The positive effect of the experimental chemical composition with the Al−Ti−N system on the viscosity and ductility indicators with a slightly lower strength and hardness ones compared with high-strength steel grade T, standardized by DSTU GOST 10791-2016, is established. It is shown that the experimental steels 2+ (Al−Ti−N) and K + (Al−Ti−N) have a zone of structural changes less by 20…30 % that indicates a higher resistance to the formation of defects of thermal origin on the rolling surface of railway wheels. Scientific novelty. The influence of the chemical composition of the experimental steels on the hardenability is established. Practical significance. The compositions of steels with a new microalloying system for railway wheels with high resistance to the formation of shelled treads and white layers on the rolling surface are substantiated. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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