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Symposium N: New Materials Containing Stable and Metastable Austenite Phase

Scope of the symposium

      Many of the recent developments in structural ferrous materials rely on the presence of the microconstituent austenite, the CFC iron phase, in order to obtain the increased toughness, or ductility needed to compensate for the increased strength achieved by modern processing. The austenite microconstituent is not thermodynamically stable at room temperature in low alloy steels and cast irons, so it has to be stabilized by supersaturating with C or N interstitial solutes, while inhibiting or retarding the precipitation of equilibrium carbides or nitrides.

      This mechanism is the basis for a large range of new materials and thermal and thermochemical processes, as for example the "expanded austenite" layers obtained by carburizing or nitriding at low temperatures chromium containing steels, the carbide free bainite (also known as "ausferrite") microconstituents found in Si or Al containing steels and cast irons isothermally treated above the Ms, the MA constituent and retained austenite present in microalloyed thermomecanically processed and TRIP steels, in "Quench & Partition" steels and cast irons and in TWIP steels.

      Another source of room temperature austenite comes from the reverse transformation of martensite during tempering at high temperatures of high toughness Ni containing steels: maraging, steels, super-martensitic stainless steels, Fe-Ni-C alloys for cryogenic applications, blast-proof steels for military ships, etc.

      The symposium will be interested on papers dealing not only with the properties, characterization and processing steels and cast irons in order to obtain suitable distributions of the austenite constituent, but also with the effect of cryogenic treatments and of strain and stress driven transformations on this metastable austenite.

Abstracts will be solicited in (but not limited to) the following topics:

Symposium Organizers

Hélio Goldenstein (USP, São Paulo, SP, Brazil)

André Paulo Tschiptschin (USP, São Paulo, SP, Brazil)

Invited speakers (tentative list)

Tadashi Furuhara (Tohoku University, Institute of Metals Research, Sendai , Japan)

Marcel A. J. Somers (Technical University of Denmark, Department of Mechanical Engineering and Rizo Laboratory.

John G. Speer (Advanced Steel Processing and Products Research Center, Colorado School of Mines, Golden, USA

Scientific committee members (tentative list)

Hélio Goldenstein (USP, São Paulo, SP, Brazil)

Andre Paulo Tschiptschin (USP, São Paulo, SP, Brazil)

Aloisio N. Klein (UFSC, Florianópolis, SC, Brazil)

Carlos M. Lepienski (UFPR, Curitiba, PR, Brazil)

Clodomiro Alves (UFRN, Natal, RN, Brazil)

Fernando Rizzo Assunçla;ão (PUC, Rio de Janeiro, RJ, Brazil)

Cesar Luiz Fontana (UDESC, Joinville, SC, Brazil)

Wilson Guesser (Fundiçla;ão Tupy, Joinville, SC, Brazil)

Dagoberto Brandão (UFMG, Belo Horizonte, MG, Brazil)

Paulo Rangel Rios (Volta Redonda, RJ, Brazil)

Tentative list of financial support for the Symposium


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