Qiao, J.; Pelletier, J.; Li, N.; Crespo, D.; Yao, Y. Journal of iron and steel research international Vol. 24, num. 4, p. 1-5 DOI: 10.1016/S1006-706X(17)30059-6 Data de publicació: 2017-04-01 Article en revista
Dynamic mechanical relaxations of La-based metallic glasses were investigated by mechanical spectroscopy. In the framework of the mixing enthalpy of constituent atoms, it was found that ß relaxation was less evident by the addition of Cu to replace Ni in the LaCuNiAl glassy alloy. By introducing Cu into the LaNiAl metallic glass, the mixing enthalpy was less negative, which led to weaker ß relaxation of the metallic glasses. The a relaxation of the La-based metallic glasses could be described by a Kohlrausch-Williams-Watts (KWW) function with a Kohlrausch exponent ßKWW around 0.5. It should be noted that physical aging above the glass transition temperature Tg induced a decrease of ß relaxation intensity in the La-based metallic glass.
Peña, B.; Arribas, M.; Carrillo, A.; Barbero, J.; Calvo, J.; Song, Y. Journal of iron and steel research international Vol. 18, num. Supplement, p. 492-499 Data de publicació: 2011-05-01 Article en revista
Nowadays il is known that the Ihennomcchanical schedules applied during hot rolling of fIal products
provide the steel with improvcd mechanical properties. In Ihis work an oplimisation tool, OptiLam (OptiLam v.l), bascd
on él predictive software alld capabIe oC generating optimised rolling schedulcs to obtain Ihe dcsired mechanical properties
in the fiual product is described. OptiLam includes somc well-knowll Illctallurgical modcls which predict microstmctural
evolution duril1g hot rolling and the trnnsConnation austenite/ferrite during the cooling. Furthennore, an oplimisation
algorithlll, which is bascd 011 the gradient mclhod, has been added, in order to design thermoI11cchanical sequences whell
a spccific final grain size is desired. OptiLam has been used to optimise rolling parameters, such as slmin and tempcrature.
Here, some of the results of Ihe software validation performed by means of hol torsion tests are presented, showing also
the fUllctionality of the tool. Finally, the application of classical optimisatiol1 1U0dels, based 011 Ihe gradient melhod, lo hot
rolling operations, is al so discussed.