Microstructure, Hardness, and Tribotechnical Properties of Low-Alloy Martensitic Steel with an Overequilibrium Nitrogen Content
摘要
Abstract
Metallographic and tribological (under dry sliding friction conditions) investigations of low-alloy steel samples with an overequilibrium nitrogen content are performed after quenching in the temperature range from (Ac3 – 50) to (Ac3 + 250)°C. Metallographic analysis demonstrates that, as the quenching temperature increases, the grain size increases and the dispersion of the martensitic structure decreases. The results of tribological studies demonstrate that, after quenching in the temperature range (Ac3 + 100)–(Ac3 + 150)°C, the content of austenite saturated with carbon and nitrogen increases, which leads to a decrease in the coefficient of friction and an increase in the wear resistance.