Seminar: Stress Corrosion Cracking Studies of Austenitic Stainless Steels - Relevance to Nuclear Technology - Department of Nuclear Engineering Seminar: Stress Corrosion Cracking Studies of Austenitic Stainless Steels - Relevance to Nuclear Technology - Department of Nuclear Engineering

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Seminar: Stress Corrosion Cracking Studies of Austenitic Stainless Steels – Relevance to Nuclear Technology

April 12, 2018 @ 4:00 pm - 5:00 pm

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Dr. V.S. RAJA
Department of Metallurgical Engineering and Materials Science
Indian Institute of Technology Bombay
Mumbai-400076, INDIA


Abstract

In-core components and primary recirculation piping as well as core shroud of boiling water reactors are made of austenitic stainless steels as these materials offer several attractive properties. However, one of the problems that limits the life of these components is intergranular stress corrosion cracking (IGSCC) of weldments. Among other factors, sensitization of weld heat affected zone and thermal decomposition of delta ferrites of the weld fusion zone contribute to cracking. Various results on low temperature sensitization of low carbon stainless steels will be described along with possible role of nitrogen on the stress corrosion cracking behaviour of type 304L stainless steel weldment vis-à-vis low temperature sensitization. Presence of 0.16 wt.% nitrogen was shown to resist low temperature sensitization and the IGSCC of the alloy for an expected plant operation of 100 years under simulated heat treatment conditions. In addition, the role of delta ferrite in SS weldments was examined using 904L stainless steel filler wire that lead to interesting results on crack morphology. These studies have significant implications with reference to degradation of stainless steels in nuclear reactors as well as used fuel dry storage tanks.

Biography

Raja, currently an Institute Chair Professor in the Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, India, received his doctoral degree from the Indian Institute of Science, Bangalore in 1987. His main research focus is structure-corrosion property correlations and he has made significant contributions to the understanding of the mechanisms of stress corrosion cracking of stainless steels, aluminum, magnesium and titanium alloys. He published over 130 papers in peer reviewed journals and book chapters, about 90 papers in conference proceedings, delivered over 100 plenary/keynote/invited lectures. He has supervised over 20 Doctoral and 100 Masters students. He is the lead editor of the book “Stress Corrosion Cracking: Theory and Practice” published by Woodhead publishers and Co-authored a book on ‘Corrosion Failures: Theory, Case Studies and Solutions’ published by John Wiley and Sons.

He is Fellows of NACE International (USA), Indian Institute of Metals, Electrochemical Society of India and received several national and international awards/recognitions including, Meritorious Contribution Award of NACE International India Section (2009); VASVIK (2014) for industrial research, Impactful Research Award by IIT Bombay (2016), Prof. S.P. Sukhatmate Excellence in Teaching Award (2016), Technical Achievement Award by NACE International USA (2017).

Details

Date:
April 12, 2018
Time:
4:00 pm - 5:00 pm
Event Categories:
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Venue

1202 Burlington Labs
2500 Stinson Drive
Raleigh, NC 27695-7909 United States
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Phone
919.515.2301