Obtaining and characterization of Ni-Ti/Ti-Mo joints welded by TIG process
| Autor: | Shiva Prasad, Renato Alexandre Costa de Santana, Mikarla Baía de Sousa, Carlos José de Araújo, Nathália Cristina Morais Lia Fook, Josiane Dantas Costa, Ana Regina Nascimento Campos, José Jailson Nicácio Alves |
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| Rok vydání: | 2016 |
| Předmět: |
0209 industrial biotechnology
Zirconium Heat-affected zone Materials science Passivation Gas tungsten arc welding Metallurgy technology industry and agriculture chemistry.chemical_element 02 engineering and technology Welding respiratory system 021001 nanoscience & nanotechnology Condensed Matter Physics Electric resistance welding Surfaces Coatings and Films Corrosion law.invention 020901 industrial engineering & automation chemistry law 0210 nano-technology Instrumentation Titanium |
| Zdroj: | Vacuum. 133:58-69 |
| ISSN: | 0042-207X |
| DOI: | 10.1016/j.vacuum.2016.08.016 |
| Popis: | The assessment of heat treatment on dissimilar Ni-Ti and Ti-Mo welding has been evaluated in this work. An experimental design 3 2 was used as optimization tool to evaluate the effect of time and temperature after the welding process on the welding quality. Welded joints without significant difference in the thickness of the welded wires were obtained successfully. After the heat treatment welded joints with shape memory were obtained. After the welding process a change in the chemical composition of the melting zone has been observed. There was a decrease of nickel, molybdenum and zirconium content and an increase of the titanium content. The temperature and time of heat treatment affected the corrosion resistance performance. It was observed that the short time and lower heat treatment temperature favors the formation of Ni 4 Ti 3 precipitate, which is responsible for the formation of stable passivation film. The longer the time and temperature of heat treatment more the decrease in the corrosion resistance and increase in the fragility of the obtained joints, and consequently the amount of the precipitated Ni 4 Ti 3 . |
| Databáze: | OpenAIRE |
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