NDLI: Microstructure and pitting corrosion of shielded metal arc welded high nitrogen stainless steel

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Microstructure and pitting corrosion of shielded metal arc welded high nitrogen stainless steel

Content Provider	Directory of Open Access Journals (DOAJ)
Author	Raffi Mohammed G. Madhusudhan Reddy K. Srinivasa Rao
Abstract	The present work is aimed at studying the microstructure and pitting corrosion behaviour of shielded metal arc welded high nitrogen steel made of Cromang-N electrode. Basis for selecting this electrode is to increase the solubility of nitrogen in weld metal due to high chromium and manganese content. Microscopic studies were carried out using optical microscopy (OM) and field emission scanning electron microscopy (FESEM). Energy back scattered diffraction (EBSD) method was used to determine the phase analysis, grain size and orientation image mapping. Potentio-dynamic polarization testing was carried out to study the pitting corrosion resistance in aerated 3.5% NaCl environment using a GillAC electrochemical system. The investigation results showed that the selected Cr–Mn–N type electrode resulted in a maximum reduction in delta-ferrite and improvement in pitting corrosion resistance of the weld zone was attributed to the coarse austenite grains owing to the reduction in active sites of the austenite/delta ferrite interface and the decrease in galvanic interaction between austenite and delta-ferrite.
Related Links	http://www.sciencedirect.com/science/article/pii/S2214914715000306
ISSN	22149147
DOI	10.1016/j.dt.2015.04.002
Journal	Defence Technology
Issue Number	3
Volume Number	11
Language	English
Publisher	KeAi Communications Co., Ltd.
Publisher Date	2015-01-01
Publisher Place	China
Access Restriction	Open
Subject Keyword	Military Science High Nitrogen Austenitic Stainless Steels (hnss) Shielded Metal Arc Welding (smaw) Cromang–n (cr–mn–n) Field Emission Scanning Electron Microscopy (fesem) Energy Back Scattered Diffraction (ebsd)
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Metals and Alloys Mechanical Engineering Computational Mechanics

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