Abstract
During the processing of maraging steels, Titanium easily combines with Nitrogen to form nitride inclusions, known to be deleterious for fatigue properties of the alloy. According to thermodynamic calculations, the precipitation occurs during solidification of the vacuum arc remelted (VAR) ingot. A coupled model of titanium nitride (TiN) inclusion precipitation and vacuum remelting has been set-up to study the inclusion cleanliness of the ingot. The nitrogen content, nuclei numeral density and solidification time appear as the key factors which control the inclusion size.
Highlights
Non-metallic inclusion (NMI) cleanliness is a major factor influencing the mechanical properties of metallic alloys, such as the fatigue strength
titanium nitride (TiN) precipitation is governed by the interfacial chemical reaction Ti + N TiN(s), characterized by its solubility product KTiN ( T ) which is related to the activities of solutes in the liquid steel at equilibrium through: eq eq
All operational data for the validation melt were stored during the actual remelting, and used as input for the simulation
Summary
Non-metallic inclusion (NMI) cleanliness is a major factor influencing the mechanical properties of metallic alloys, such as the fatigue strength. We will focus our attention on one given grade, namely 18% Ni, 9% Co, 5% Mo and 0.45% Ti, with residual Nitrogen, for which titanium nitride (TiN) inclusions represent the most harmful NMI.
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