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Title: Arc distribution during the vacuum arc remelting of Ti-6Al-4V

Abstract

Currently, the temporal distribution of electric arcs across the ingot during vacuum arc remelting (VAR) is not a known or monitored process parameter. Previous studies indicate that the distribution of arcs can be neither diffuse nor axisymmetric about the center of the furnace. Correct accounting for the heat flux, electric current flux, and mass flux into the ingot is critical to achieving realistic solidification models of the VAR process. The National Energy Technology Laboratory has developed an arc position measurement system capable of locating arcs and determining the arc distribution within an industrial VAR furnace. The system is based on noninvasive magnetic field measurements and a VAR specific form of the Biot–Savart law. The system was installed on a coaxial industrial VAR furnace at ATI Albany Operations in Albany, OR. This article reports on the different arc distributions observed during production of Ti-6Al-4V. It is shown that several characteristic arc distribution modes can develop. This behavior is not apparent in the existing signals used to control the furnace, indicating the measurement system is providing new information. It is also shown that the different arc distribution modes observed may impact local solidification times, particularly at the side wall.

Authors:
 [1];  [1];  [2]
  1. U.S. DOE
  2. ATI Albany Operations
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research; National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1129762
Report Number(s):
A-NETL-PUB-015
Journal ID: ISSN 1073--5615
Resource Type:
Journal Article
Resource Relation:
Journal Name: Metallurgical and Materials Transactions B - Processing Metallurgy and Materials Processing Science; Journal Volume: 44; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Woodside, Charles Rigel, King, Paul E., and Nordlund, Chris. Arc distribution during the vacuum arc remelting of Ti-6Al-4V. United States: N. p., 2013. Web. doi:10.1007/s11663-012-9760-1.
Woodside, Charles Rigel, King, Paul E., & Nordlund, Chris. Arc distribution during the vacuum arc remelting of Ti-6Al-4V. United States. doi:10.1007/s11663-012-9760-1.
Woodside, Charles Rigel, King, Paul E., and Nordlund, Chris. Tue . "Arc distribution during the vacuum arc remelting of Ti-6Al-4V". United States. doi:10.1007/s11663-012-9760-1.
@article{osti_1129762,
title = {Arc distribution during the vacuum arc remelting of Ti-6Al-4V},
author = {Woodside, Charles Rigel and King, Paul E. and Nordlund, Chris},
abstractNote = {Currently, the temporal distribution of electric arcs across the ingot during vacuum arc remelting (VAR) is not a known or monitored process parameter. Previous studies indicate that the distribution of arcs can be neither diffuse nor axisymmetric about the center of the furnace. Correct accounting for the heat flux, electric current flux, and mass flux into the ingot is critical to achieving realistic solidification models of the VAR process. The National Energy Technology Laboratory has developed an arc position measurement system capable of locating arcs and determining the arc distribution within an industrial VAR furnace. The system is based on noninvasive magnetic field measurements and a VAR specific form of the Biot–Savart law. The system was installed on a coaxial industrial VAR furnace at ATI Albany Operations in Albany, OR. This article reports on the different arc distributions observed during production of Ti-6Al-4V. It is shown that several characteristic arc distribution modes can develop. This behavior is not apparent in the existing signals used to control the furnace, indicating the measurement system is providing new information. It is also shown that the different arc distribution modes observed may impact local solidification times, particularly at the side wall.},
doi = {10.1007/s11663-012-9760-1},
journal = {Metallurgical and Materials Transactions B - Processing Metallurgy and Materials Processing Science},
number = 1,
volume = 44,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 2013},
month = {Tue Jan 01 00:00:00 EST 2013}
}