نوع مقاله : مقاله پژوهشی
نویسنده
دانشکده مهندسی متالورژی و مواد دانشگاه علم و صنعت ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسنده [English]
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.
کلیدواژهها [English]
)