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Effect of fillers on the microstructure, mechanical properties, and hot corrosion behavior of Nb stabilized austenitic stainless steel welds

Published online by Cambridge University Press:  22 December 2016

K. Devendranath Ramkumar ,
S. Anirudh ,
Shubham Singh ,
Sahil Goyal ,
Saurabh Kumar Gupta ,
Joshy Chellathu George  and
N. Arivazhagan
K. Devendranath Ramkumar*
Affiliation:
School of Mechanical Engineering, VIT University, Vellore 632014, India
S. Anirudh
Affiliation:
School of Mechanical Engineering, VIT University, Vellore 632014, India
Shubham Singh
Affiliation:
School of Mechanical Engineering, VIT University, Vellore 632014, India
Sahil Goyal
Affiliation:
School of Mechanical Engineering, VIT University, Vellore 632014, India
Saurabh Kumar Gupta
Affiliation:
School of Mechanical Engineering, VIT University, Vellore 632014, India
Joshy Chellathu George
Affiliation:
School of Mechanical Engineering, VIT University, Vellore 632014, India
N. Arivazhagan
Affiliation:
School of Mechanical Engineering, VIT University, Vellore 632014, India
*
a)Address all correspondence to this author. e-mail: deva@vit.ac.in
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Abstract

This research article addresses the effect of fillers on the high-temperature corrosion behavior of AISI 347 weld joints. Multi-pass pulsed current gas tungsten arc welding was carried out on 6.67 mm thick plates of AISI 347 using three different fillers namely ER347, ER2553, and ERNiCrMo-3. The fusion zone microstructures of AISI 347 employing ER2553 and ERNiCrMo-3 exhibited columnar and dendritic grain growth; whereas vermicular delta ferrite was observed at the fusion zone of ER347 welds. Tensile studies showed that the weld employing ERNiCrMo-3 exhibited better tensile strength than the parent metal. High-temperature corrosion studies were carried out on the fusion zones by exposing the coupons to an aggressive, synthetic molten-salt incinerator environment containing 40% Na2SO4–40% K2SO4–10% NaCl–10% KCl at 650 °C for 50 cycles. The studies attested that the fusion zone employing ERNiCrMo-3 exhibited better corrosion resistance than the other two fillers used in the study. Spallation of oxides was witnessed due to the dissolution of Cr2O3 in the ER347 and ER2553 fusion zones. The hot corroded samples were characterized using surface analytical techniques.

Keywords

AISI 347pulsed current gas tungsten arc weldingmicrostructuremechanical propertieshot corrosion
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 3 , 14 February 2017 , pp. 582 - 598
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Copyright
Copyright © Materials Research Society 2016 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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