Investigating on the Reverse Transformation of Martensite to Austenite and Pseudoelastic Behavior in Ultrafine-Grained Fe-10Ni-7Mn (wt %) Steel Processed by Heavy Cold Rolling

Abstract:

Fe-10Ni-7Mn (wt. %) steel is a member of ultrahigh strength steels which shows good ductility in the solution annealed condition and excellent age hardenability. In the current research, this alloy was subjected to heavy cold rolling in which the reverse transformation of martensitic to austenite was brought about. From the XRD, DSC and dilatometric analyses, it is resulted that after 60 % cold rolling the austenite phase may be formed by displacive mechanism. Stability of austenite at room temperature is referred to the ultrafine/nanograin size of austenite after deformation which prevents the austenite to martensite transformation. The presence of ultrafine/nanoaustenite formed by displacive mechanism leads to the observation of new mechanical properties during cyclic tensile test. This behavior is known as pseudoelastic phenomenon. In this behavior, during loading-unloading tensile cycle, the shape of the specimen return to its original configuration with a hysteresis loop in its path to the zero strain point.

• Periodical: Advanced Materials Research (Volume 829)
• Pages: 25-29
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.829.25
• Online since: November 2013
• Authors: Hamidreza Koohdar*, Mahmoud Nili-Ahmadabadi, M.H. Parsa, Hadi Ghasemi-Nanesa
• Keywords: Cold Rolling, Fe-10Ni-7Mn (Wt %) Alloy, Pseudoelasticity, Reverse Transformation

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