Ultrafine grained Fe-Cr-Ni austenitic stainless steels by cold rolling and reversion annealing: A review of progress in Iran

Document Type: Review Paper

Authors

School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran.

Abstract

The notable contributions of Iranian scientists in the field of formation and reversion of strain-induced martensite for grain refinement and enhanced mechanical properties of Fe-Cr-Ni austenitic stainless steels are reviewed. Accordingly, the processing of ultrafine grained (UFG) structure via cold rolling and reversion annealing is summarized for AISI 301, 304, 309Si, 316, and 321 stainless steels, as well as their variants. The repetitive and innovative thermomechanical processing routes are introduced as well. The understanding of the stages of annealing (reversion of strain-induced martensite to austenite, primary recrystallization of the retained austenite, and grain growth) and the underlying reversion mechanisms (diffusional-type and martensitic shear-type) constitute the subsequent part of this overview. Finally, the transformation-induced plasticity (TRIP) effect in the reversion-treated metastable austenitic stainless steels is discussed. The present review paper summarizes these achievements with the discussion on the future prospects in this research field.

Keywords


84. A. Järvenpää, Microstructures, Mechanical stability and strength of low-temperature AISILN stainless steel under monotonic and dynamic loading, Ph.D. Thesis, University of Oulu, Oulu, Finland, 2019.