Carbon diffusion in 304I austenitic stainless steel at 650 steel at 650 -750°c in carburizing environment
A 304L austenitic stainless steel is widely used in the petrochemical industry. As it is exposed to carburizing environment, carbon diffuses into metal and form carbides. Effect of the environment on the carbon diffusion is interesting to be known. This study will evaluate the effect of CH4 /H2...
| Main Authors: | , |
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| Format: | Article |
| Language: | English English |
| Published: |
Blue Eyes Intelligence Engineering and Sciences Publication
2019
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/76502/ http://irep.iium.edu.my/76502/ http://irep.iium.edu.my/76502/1/76502_Carbon%20Diffusion%20in%20304l%20Austenitic%20_article.pdf http://irep.iium.edu.my/76502/2/76502_Carbon%20Diffusion%20in%20304l%20Austenitic%20_scopus.pdf |
| Summary: | A 304L austenitic stainless steel is widely used in
the petrochemical industry. As it is exposed to carburizing
environment, carbon diffuses into metal and form carbides.
Effect of the environment on the carbon diffusion is interesting to
be known. This study will evaluate the effect of CH4
/H2 gas
concentration and carburizing temperature on carbon diffusion
in 304L austenitic stainless steel. Horizontal furnace equipped
with a quartz tube and vacuum pump was used to expose the
samples to carburizing environment at 650°C - 750°C and 20% -
40% CH4
/H2 gas composition for 100 hours. Optical microscopy
examination of cross-sectioned specimens of 304L stainless steel
showed that no carburizing zone formed after the samples
subjected to 20% CH4
/H2 gas composition at 650˚C. It is observed
that low carbon deposited on substrates with an average 0.0011g
and carbon activity, ac
, equal to 0.31. In comparison, with 40%
CH4
/H2 gas composition at 650˚C, the average carbon deposited
on the surface was two times more and carbon activity increased
more than one, known as carburizing zone. Carbon diffusion at
750°C was deeper than at 650°C for both CH4
/H2 gas
concentrations 20% - 40%. In conclusion the depth of the
carburization zone increases with increasing the temperature
from 650˚C to 750˚C and increases with increasing percentage of
CH4
/H2 gas composition. |
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