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Observations on electron beam melting of titanium and its alloy Takagi, Ken’ichiro
Abstract
The advantages of the melting of titanium and its alloys in an electron beam furnace are well understood in terms of homogenization, but it is clear that a major problem is that of evaporation of volatile elements. The purpose of the present study Is to investigate the evaporation of solutes such as aluminum from titanium alloys and the conditions under which the evaporation takes place. The surface temperatures of the molten metal were measured by an optical pyrometer. Its accuracy was checked by measuring the evaporation rate of pure titanium over the range of experimental temperatures used. From the analysis of the aluminum evaporation rate from Ti-Al-V alloy, it has been established that the Langmuir equation may be applied; that is, the evaporation takes place from a well-mixed pool of uniform composition with a very small mass transfer resistance. Also, the specific evaporation constant and the activity coefficient of aluminum were calculated. Attempts were made to use the EDX equipment directly to measure the aluminum concentration changes during melting. This technique may be promising although the method and conditions were not fully defined.
Item Metadata
Title |
Observations on electron beam melting of titanium and its alloy
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1984
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Description |
The advantages of the melting of titanium and its alloys in an electron beam furnace are well understood in terms of homogenization, but it is clear that a major problem is that of evaporation of volatile elements. The purpose of the present study Is to investigate the evaporation of solutes such as aluminum from titanium alloys and the conditions under which the evaporation takes place.
The surface temperatures of the molten metal were measured by an
optical pyrometer. Its accuracy was checked by measuring the
evaporation rate of pure titanium over the range of experimental temperatures used.
From the analysis of the aluminum evaporation rate from Ti-Al-V alloy, it has been established that the Langmuir equation may be applied; that is, the evaporation takes place from a well-mixed pool of uniform composition with a very small mass transfer resistance. Also, the specific evaporation constant and the activity coefficient of aluminum were calculated.
Attempts were made to use the EDX equipment directly to measure the aluminum concentration changes during melting. This technique may be promising although the method and conditions were not fully defined.
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Genre | |
Type | |
Language |
eng
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Date Available |
2010-05-24
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0078753
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.