Go to  Advanced Search

Removal of calcium containing inclusions during vacuum arc remelting

Show full item record

Files in this item

Files Size Format Description   View
UBC_1983_A7 S35.pdf 4.547Mb Adobe Portable Document Format   View/Open
 
Title: Removal of calcium containing inclusions during vacuum arc remelting
Author: Samuelsson, Eva
Degree Master of Applied Science - MASc
Program Metallurgical Engineering
Copyright Date: 1983
Abstract: The mechanism of removal of calcium containing inclusions in steel during Vacuum Arc Remelting has been investigated. Laboratory Electron Beam and industrial Vacuum Arc remelting electrodes and ingots were examined. Properties of the steels were determined with the aid of chemical and metallographic methods. It is proposed that the major mechanism of removal is rejection of calcium aluminates to a free surface. One third of the calcium sulphide is rejected with the calcium aluminates. The remainder reacts with aluminium oxide in the aluminates according to the following reaction: CaS + 1/3Al₂O₃= CaO + 2/3[Al] + [S]. Subsequently, the calcium oxide is also rejected and the dissolved sulphur reacts with sulphide forming elements during solidification. The final calcium content of the remelted steels, 5-10 ppm, was independent of the calcium content of the electrode. The results of this study are not in agreement with previous work, which attempts to establish the composition of the calcium aluminates as a function of the steel content of sulphur, aluminium and calcium. Specifically it is found that the influence of oxygen content has not previously been sufficiently taken into account.
URI: http://hdl.handle.net/2429/24092
Series/Report no. UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/]
Scholarly Level: Graduate

This item appears in the following Collection(s)

Show full item record

All items in cIRcle are protected by copyright, with all rights reserved.

UBC Library
1961 East Mall
Vancouver, B.C.
Canada V6T 1Z1
Tel: 604-822-6375
Fax: 604-822-3893