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Manchester Metallurgical Society Seminar entitled “The effect of surface preparation on Materials Performance of structural alloys in Nuclear Environment”

Starts:18:00 5 Feb 2019
Ends:20:00 5 Feb 2019
What is it:Seminar
Organiser:Department of Materials
How much:Free
Speaker:Dr. Fabio Scenini
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  • By Department of Materials

Surface machining is often assumed to be detrimental to Stress Corrosion Cracking (SCC) in nuclear power plant components because of localized deformation, high associated hardness, roughness and tensile residual stresses. However, in our recent work on SCC initiation of austenitic stainless steels in high-temperature water shows that a few microns thick ultrafine-grained layer introduced by machining improved SCC initiation resistance. Removing the macroscopic machining ridges via grinding decreased the residual tensile stress but led to more extensive cracking. This paradigm shift demonstrates the dominant effect of the microstructure on the oxidation over the mechanical driving force for SCC. Other examples that goes against the general wisdom of the effect of surface preparation on materials performance will also be discussed; these include Ni-base alloys used in primary and secondary water of Pressurized Water Reactors (PWRs) as well as stainless steels susceptible to carburization and creep in Advanced Gas Cooled reactors (AGRs).

Price: Free

Speaker

Dr. Fabio Scenini

Organisation: The University of Manchester

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C15
MSS Tower
Manchester

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Dr. Ed Pickering

ed.pickering@manchester.ac.uk

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