The influence of O, N and H on the structure of the metal base of gray cast iron in castings of piston ring blanks
DOI:
https://doi.org/10.15407/mom2025.03.045Keywords:
piston rings, cast iron, gases, crystallization, pearlite, bainite, martensiteAbstract
The influence of oxygen, nitrogen and hydrogen on the structure of the metal base of castings of piston ring blanks with a diameter of 110 and 130 mm from gray iron, made from a charge based on blast furnace iron from different enterprises, was studied. A comprehensive correlation analysis of the significance of the influence of the diameter of castings of ring blanks and their chemical composition on the formation of the bainite-martensitic structure of the metal base of gray iron was carried out. Oxygen, nitrogen and hydrogen have a complex effect on the resistance of austenite to decomposition during supercooling, but they act in the same way - towards its stabilization, contributing to the hardening of gray iron. The minimum total amount of oxygen, nitrogen and hydrogen leads to partial bleaching of studied castings. Oxygen has a greater effect on the structure of the metal base of gray cast iron in investigated castings than nitrogen and hydrogen, which enhance this effect to varying degrees. The difference in the cooling rate has practically no effect on the formation of a quenching bainite-martensitic structure. Carbon does not have a significant effect on the tendency of cast iron to quench. Among the alloying and impurity elements, the greatest influence on the formation of the bainite-martensitic structure is exerted by manganese, sulfur, phosphorus and nickel. The increased content of gases, especially oxygen, coming from the charge materials, primarily from blast furnace iron, in the absence of melt refining under other equal conditions of smelting is the main reason for the formation of the quenching bainite-martensitic structure of the metal base of gray cast iron in the castings of piston ring blanks. The influence of manganese, sulfur and phosphorus under the conditions of the experiment is secondary.
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Copyright (c) 2025 А. Yu. Borysenko, L. S. Мolchanov, Т. S. Golub
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