Metallurgical Engineering

Metallurgical Engineering

Effect of cold rolling value on the shape memory property of Fe-9.5Ni-6.5Mn (wt.%) martensitic alloy

Document Type : Research Paper

Author
Hamidreza Koohdar
Assistant Professor
10.22076/me.2023.2008739.1384
Abstract
In this research, the effect of cold rolling percent on the microstructure and shape memory effect (SME) of an Fe-9.5Ni-6.5 Mn (wt.%) alloy was investigated. Experimental results such as X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) analyses revealed that the microstructure of the initial alloy in the solution annealed condition was a fully lath -martensite with a high density of dislocation. Under cold rolling with 60 and 90% reductions in thickness, the austenite () phase with a fine grain size was partially induced in the martensite matrix through a shear  transformation, resulting in the development of a dual-phase () steel. Strain-induced austenite inherited the dislocation structure from the parent martensite due to have a shear nature. In addition, the volume fraction of the induced austenite in the microstructure of the initial alloy increased by increasing the rolling percent. The tensile test results indicated a maximum shape recovery of 35% at 1% pre-strain for the 90% cold rolled specimen. Also, the observation of strain hysteresis in the cyclic stress-strain curve of the cold rolled specimen by 90% confirmed the presence of the pseudoelastic behavior for this sample. The presence of austenite phase with high density of dislocation in the dual-phase steel was the main reason for appearance the SME and pseudoelastic behavior.
Keywords
Fe-Ni-Mn martensitic steel
Cold rolling
Microstructure evolution
Austenite
Shape memory effect
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  • Receive Date 07 August 2023
  • Revise Date 26 October 2023
  • Accept Date 24 December 2023