Surface modification of mild steel using tungsten inert gas torch surface cladding
There is an increasing demand for claddings which possess an optimized combination of different functional properties such as high hardness, high resistance to wear and oxidation. In this respect, hard TiAlN cladding has gained much attention. These claddings can be suitable replacements for the...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Science Publications
2010
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/5432/ http://irep.iium.edu.my/5432/ http://irep.iium.edu.my/5432/ http://irep.iium.edu.my/5432/1/Americal_J_of_Applied_sciences_2010.815.822.pdf |
| Summary: | There is an increasing demand for claddings which possess an
optimized combination of different functional properties such as high hardness, high resistance to wear
and oxidation. In this respect, hard TiAlN cladding has gained much attention. These claddings can be
suitable replacements for the conventional ceramic coatings applied in many components of chemical
plants and automotive industries to protect against high temperature oxidation and wear. Approach: In
this study the possibility of the formation of intermetallic and nitride claddings on plain carbon steel
surfaces by in situ melting of preplaced titanium and aluminum powder mixture under Tungsten Inert
Gas (TIG) torch had been investigated. Results: Addition of 1.3 and 1.8 mg mm-2 Ti and Al powder
and melting at energy inputs between 540-675 J mm-1 in nitrogen environment successfully created
more than 1 mm thick clad layer consisting of a mixture of titanium-aluminum nitrides and aluminides.
All resolidified melt layers produced dendrite microstructures; the dendrite concentration is more near the
surface area compared to the deeper melt depth. A maximum surface hardness of around 900 Hv was
developed in most of the tracks and this hardness corresponds to high concentration of dendrites within
the modified layer. Oxidation at 600°C for 72 h, of the clad steel gave weight gains of 0.13 mg mm-2,
compared to 0.37 mg mm-2 for the substrate. Conclusion: The results showed that clad steel gave
better mechanical and oxidation properties compared to plain carbon steel substrate. |
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