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Research and Study of Mechanical Properties and Corrosion Behavior of Welded Joint of Ductile Cast Iron to AISI 304 Austenitic Stainless Steel with Buttering of Nickel on Cast Iron Side

Mokhtabad Amrei, Mohsen | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40300 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Kokabi, Amir Hossein
  7. Abstract:
  8. The current work is carried out to characterize welding of AISI 304 Austenitic Stainless Steel to Ductile Cast Iron. The welding method was SMAW and the welds were produced using a Nickel-Buttering by a pure Nickel electrode(ENi1) on Cast Iron side, then by 4 types of filler materials the joints were produced; Ni-base electrode(Ni1), E308 and E309 Austenitic stainless steel electrodes and E7018 electrode. The preheat temperature of Cast Iron has been selected to be 250○ and 500 ○C to avoid crack of weldments. The comparative evaluation was based on metallography, chemical composition, hardness and corrosion behavior on two different preheat temperatures. According to metallography, the best distribution of carbon particles was provided in 500○C of preheat temperature and as a result the relatively efficient thickness for Nickel buttering were determined to less than 1.5mm to permit crashed particles of Graphite to enter un molten weld metal . Generally the samples with 500○C preheat showed better quality, ductility and less hardness and more corrosion resistance. The maximum hardness is achieved by E7018-500 (the sample with 500 ○C of preheat and E7018 as a filler) and the minimum was ENi-500. The worst couple for galvanic corrosion was Cast Iron-Ni Buttering and the best was St.St. 304 with ENi-500. There were no risk of pitting corrosion for all fillers, but there were for Stainless Steel and Cast Iron.



  9. Keywords:
  10. Austenitic Stainless Steel ; Mechanical Properties ; Galloping ; Corrosion ; Ductile Cast Iron ; Nickel Buttering

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