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Kalpakkam, India & Newcastle, UK
Studied Barkhausen behaviour of plain carbon and Cr-Mo power plant steels after tempering [1, 2, 3]
On tempering:
Martensite (bct) changes to ferrite (bcc) by precipitation of carbides
Initial carbides are replaced by more thermodynamically stable ones
As time goes on, carbide precipitates coarsen
Ferrite grains also coarsen