Development of shape memory effect in an Fe-based alloy under heavy cold rolling
Publish Year: 1401
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
IMES16_159
تاریخ نمایه سازی: 25 اسفند 1401
Abstract:
This research was conducted to examine the effect of heavy cold rolling process on the microstructureand shape memory effect (SME) of Fe-۹.۵Ni-۶.۵ Mn (wt.%) steel. Experimental results such as X-raydiffraction (XRD) and electron backscatter diffraction (EBSD) analyses revealed that themicrostructure of the initial alloy in the solution annealed condition was a fully lath -martensitewith a high density of dislocation. Under heavy cold rolling with ۹۰% reduction in thickness, theaustenite () phase with a fine grain size was partially induced in the martensite matrix through ashear transformation, resulting in the development of a dual-phase () steel. Strain-inducedaustenite inherited the dislocation structure from the parent martensite due to the shear nature of thetransformation. The tensile test results indicated a shape recovery of ۳۵% at ۱% pre-strain for thecold rolled specimen. The presence of austenite phase with high density of dislocation in the dualphasesteel was the main reason for appearance the SME.
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Authors
Hamidreza Koohdar
Assistant Professor in Materials and Metallurgy Engineering at Iran University of Science and Technology (IUST), Tehran, Iran