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.
Highlights
Among structural materials, titanium and its alloys occupy a special position
The microstructure of titanium containing 0.07 oxygen consists of α-phase, whereas an oxygen content of 0.40 wt.-% leads to the formation of α’-phase (Figure 1)
The results show, that after the heat treatment step no precipitation of dispersed particles did occur and oxygen is in solid solution in the investigated samples
Summary
Titanium is considered as a basic structural material for many industries, including the medical sector. In the latter case, beside high specific strength and resistance to impact loading, the most important requirements for medical tita-. By controlling its content in the metal, it is possible to reach the optimal ratio of plasticity and strength characteristics of the material In this case, it is very important to ensure uniform distribution and desirable form of oxygen in the metal. It is very important to ensure uniform distribution and desirable form of oxygen in the metal This is achieved by applying appropriate technologies for melting and heat treatment. ChESR provides, as well as other remelting processes, a good structural and chemical homogeneity of the ingots with a typical as-cast structure [2]-[9]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
