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Microstructural and Electrochemical Evaluation of Fusion Welded Low-Nickel and 304 SS at Different Heat Input

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Abstract

The present research study investigates the effect of heat input using E 308 electrode (controlled by welding current, i.e., 70, 85 and 100 A) on microstructure, mechanical properties and corrosion behavior of low-nickel and 304 stainless steel (SS) weldments produced by shielded metal arc welding technique. SEM investigation shows that with the higher heat input, δ-ferrite content was reduced. Dendrite and inter-dendritic length is also reduced by lowering the heat input. For all the heat inputs, it is observed that δ-ferrite content was higher in 304 stainless steel (SS) as compared to that of low-nickel austenitic stainless steel (Cr-Mn SS). Considering the heat input for Cr-Mn SS, coarse grains were observed in the heat-affected zone region. For low heat input (LHI), tensile fracture surface has exhibited river-like pattern with dimple appearance. Corrosion studies show better pitting resistance for low heat input (LHI) samples due to higher δ-ferrite present in the weld region. Similarly, higher interphase corrosion resistance is observed in both the SS grades causing more dissolution in the LHI samples.

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Acknowledgments

The authors would like to thank Director Dr. N. S. Chaudhary, VNIT Nagpur, for providing the necessary facilities for carrying out this investigation and for his constant encouragement to publish this work. The authors are grateful to Jageswar Verma (Research Scholar, Corrosion Engineering Laboratory, Department of Metallurgical and Material Engineering) for his help in conducting the electrochemical tests, Mr. Shreedhar Gadge (Senior Technician, Chemical Analysis Laboratory Department of Metallurgical and Materials Engineering) for performing the solution annealing treatment and Mr. Ventak Raman (Ador Fontech Ltd.) for proving welding facility.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology (VNIT), Nagpur, 440010, India

    Ankur V. Bansod, Awanikumar P. Patil & Sourabh Shukla

  2. Hoganas India Private Ltd., Plot No 28, Hadapsar, Pune, 411001, India

    Abhijeet P. Moon

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  1. Ankur V. Bansod
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Correspondence to Ankur V. Bansod.

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Bansod, A.V., Patil, A.P., Moon, A.P. et al. Microstructural and Electrochemical Evaluation of Fusion Welded Low-Nickel and 304 SS at Different Heat Input. J. of Materi Eng and Perform 26, 5847–5863 (2017). https://doi.org/10.1007/s11665-017-3054-3

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