What is it about?
Some materials are designed to work at very high temperatures, but the exposition to these temperatures cause problems. This is the case of this steel, which is normally ductile, but becomes brittle after exposition to the working temperatures. The loss of ductility is not important for the continuous service, but if this is interrupted, the part wiil fracture (for example during a maintenance action) and will need to be substituted.
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Why is it important?
The substitution of the part means a new one must be installed, but the biggest problem is the elongation of the maintenance times, since these furnaces are expected to operate continuously.
Perspectives
In the present work we investigated the fracture, which is important to understand the phenomenon. We could not provide an explanation for the loss of ductility, but we were able to rule out some explanations which were previously proposed.
Professor Claudio Geraldo Schön
Universidade de Sao Paulo Campus da Capital
Read the Original
This page is a summary of: Microstructural and fractographic investigation of a centrifugally cast 20Cr32Ni+Nb alloy tube in the ‘as cast’ and aged states, Journal of Materials Research and Technology, April 2013, Elsevier,
DOI: 10.1016/j.jmrt.2013.02.006.
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