What is it about?
Forming of the delta ferrite is possible during solidification or welding austenitic stainless steels. Delta ferrite is stabile on room temperature but during a heat treatment it transforms into sigma phase, carbides and austenite. In this work the results of analysis of influence of temperature and time on decomposition of delta ferrite are presented.
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Why is it important?
Tthe delta ferrite plays a very important role in welding of austenitic stainless steels because it prevents formation of hot cracks. So it is recommended up to 10% of delta ferrite in weld metal be. Also, precipitation of intermetallic phase is increased in presence of delta ferrite.
Perspectives
The idea of delta ferrite research and its impact on material properties originated during the preparation of my doctoral dissertation. Samples of austenitic steel with different ratio of delta ferrite were tested. The mechanical properties were tested. Since it is a steel that is applied at elevated temperatures, it was interesting to see what happens to delta ferrite.
Almaida Gigovic-Gekic
University of Zenica, Faculty of Metallurgy and Technology, Bosnia and Herzegovina
Read the Original
This page is a summary of: Effect of Temperature and Time on Decomposition of δ-ferrite in Austenitic Stainless Steel, Materials and Geoenvironment, July 2020, De Gruyter,
DOI: 10.2478/rmzmag-2020-0007.
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