TITLE:
Influence of Oxygen Addition on Structure and Properties of Titanium Produced by Electroslag Remelting
AUTHORS:
Olga Snizhko, Anatoliy Ryabtsev, Alexandr Troyanskyy, Vladimir Pashinskii, Bernd Friedrich, Johannes Morscheiser, Marek Bartosinski
KEYWORDS:
Titanium, Oxygen, Electroslag Remelting, Alloying, Heat-Treatment, Shear Transformation, Recrystallization, Deformation Work-Hardening, Structure Refinement
JOURNAL NAME:
Materials Sciences and Applications,
Vol.7 No.3,
March
9,
2016
ABSTRACT: The current work is devoted to the investigation of oxygen impact on the structure and properties of titanium. For this purpose, oxygen was introduced into titanium during chamber electro-slag remelting by three different methods: alloying by oxygen-rich residues from the Kroll process to final values between 0.053 wt.-% and 0.40 wt.-%, by reaction with the gas phase to 0.27 wt.-% and by introduction of TiO2 nanoparticles to 0.73 wt.-%. The influence of oxygen on microstructure of titanium during crystallization, heat treatment and deformation is determined as well as the effect of oxygen on the hardness and the mechanical properties of the material in different structural states. Furthermore, control methods of the structure formation process by thermal effects are proposed. Results show that the chamber electroslag remelting allows obtaining a homogeneous structure of the ingot in the investigated range of oxygen content in titanium. The hardness does not vary by more than 10 percent in longitudinal or radial direction in any of the remelted ingots.