|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Phase Transformations in Multi-component Systems: An MPMD Symposium Honoring Gary R. Purdy
||On the Roles of Dislocations in Austenite Reversion from Martensite
||Jiayi Yan, Annika Borgenstam, John Ågren
|On-Site Speaker (Planned)
Austenite reversion from martensite in steels has become increasingly attractive as a way to obtain high strength and ductility. For predictive design of steels based on austenite reversion, it is crucial to model the transformation kinetics accurately. As part of a general picture we discuss how austenite reversion may be affected by the dislocations in lath martensite. Carbon segregation to dislocations leads to a reduction of the chemical potential of carbon in martensite, which is considerable at low temperatures yet small at intercritical annealing temperatures. The dislocations in martensite may also contribute an interfacial dissipation work based on forest hardening mechanism, if the martensite-austenite interface remains semicoherent and glissile. In this case the austenite from reversion inherits the high density of dislocation when dislocation recovery is slow. The dislocation-induced dissipation work is estimated and its effect on austenite reversion kinetics is discussed.
||Planned: A print-only volume