On the role of molybdenum on the microstructural, mechanical and corrosion properties of the GTAW AISI 316 stainless steel welds
| Autor: | Meysam Toozandehjani, Intan Fadhlina Mohamed, Farhad Ostovan, Masoud Soltani, Ehsan Shafiei |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Corrosion resistance chemistry.chemical_element Mechanical properties 02 engineering and technology Welding 01 natural sciences Indentation hardness law.invention Carbide Corrosion Biomaterials AISI 316 austenitic stainless steel law 0103 physical sciences GTAW 010302 applied physics Austenite Molybdenum Mining engineering. Metallurgy Gas tungsten arc welding Metallurgy Metals and Alloys TN1-997 021001 nanoscience & nanotechnology Surfaces Coatings and Films chemistry Filler metal Ceramics and Composites Grain boundary 0210 nano-technology |
| Zdroj: | Journal of Materials Research and Technology, Vol 13, Iss, Pp 2115-2125 (2021) |
| ISSN: | 2238-7854 |
| Popis: | A comparative study was carried out on GTAW AISI 316 welds fabricated by three different filler metals including ER-317M, ER-316 and ER-308. Filler metals were selected in a way to induce varying Molybdenum (Mo) concentrations in the weld metal, so that the effect of Mo on the microstructural, mechanical and corrosion behavior of the welds was investigated. Microstructural studies revealed that as Mo concentration increased in the weld metal, the dendritic morphology of this zone gradually was changed from cellular dendritic to columnar dendritic and a noticeable amount of austenitic phase and precipitations were formed. Mo-containing ER-316 and ER-317M welds showed appreciable amount of Mo- and Cr-rich carbides such as (Fe,Cr)23C6 which formed at the grain boundaries of δ-ferrite phase resulting in increased the hardness and strength of welded samples. The highest microhardness value of 188 HV and yield strength of 330 MPa belonged to ER-317M welds containing the highest Mo concentration. Also, corrosion resistance of the welds significantly improved by increasing Mo concentration and a minimum corrosion rate of 4.178 mm/year was accounted for ER-317M welds in which, the formation of passive film was more facilitated due to the higher concentration of Mo. |
| Databáze: | OpenAIRE |
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