مهندسی متالورژی

مهندسی متالورژی

تاثیر میزان نورد سرد بر خاصیت حافظه‌داری آلیاژ مارتنزیتی Fe-9.5Ni-6.5Mn (wt.%)

نوع مقاله : مقاله پژوهشی

نویسنده
دانشکده مهندسی متالورژی و مواد دانشگاه علم و صنعت ایران
چکیده
در این تحقیق، تاثیر میزان نورد سرد بر ریزساختار و اثر حافظه‌داری شکلی آلیاژ Fe-9.5Ni-6.5Mn (wt%) مورد ارزیابی قرار گرفت. نتایج حاصل از آنالیزهای پراش پرتو ایکس و پراش الکترون برگشتی نشان دادند که آلیاژ اولیه در حالت آنیل محلولی، دارای ریزساختار کاملا مارتنزیتی از نوع مارتنزیت آلفاپریم () با مورفولوژی لایه‌ای شکل همراه با دانسیته بالای نابجایی بود. پس از اعمال فرایند نورد سرد به میزان 60 و 90% بر روی آلیاژ اولیه، کسر کوچکی از فاز آستنیت () ریزدانه در اثر رخداد دگرگونی برشی  در زمینه مارتنزیتی ایجاد شده و یک فولاد دوفازی () حاصل گردید. آستنیت ایجاد شده در اثر اعمال کرنش بدلیل داشتن ماهیت برشی، ساختار نابجایی را از فاز مارتنزیت مادر به ارث برد. همچنین، کسر حجمی آستنیت ایجاد شده در ریزساختار آلیاژ اولیه با افزایش میزان نورد افزایش یافت. نتایج آزمون کشش مقدار بیشینه بازیابی شکلی در حدود 35% در میزان پیش-کرنش 1% را برای نمونه نورد سرد شده به میزان 90% نشان داد. همچنین، مشاهده هیسترزیس کرنشی در نمودار تنش-کرنش سیکلی نمونه نورد شده به میزان 90% نشان از وجود رفتار سودوالاستیک در این نمونه بود. حضور فاز آستنیت با دانسیته بالای نابجایی در ریزساختار آلیاژ دوفازی ایجاد شده در اثر نورد، عامل اصلی مشاهده اثر حافظه‌داری شکلی و رفتار سودوالاستیک بود.
کلیدواژه‌ها

عنوان مقاله English

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

نویسنده English

Hamidreza Koohdar
Assistant Professor
چکیده 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

Fe-Ni-Mn martensitic steel
Cold rolling
Microstructure evolution
Austenite
Shape memory effect
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دوره 27، شماره 2 - شماره پیاپی 94
تابستان 1403
صفحه 115-124

  • تاریخ دریافت 16 مرداد 1402
  • تاریخ بازنگری 04 آبان 1402
  • تاریخ پذیرش 03 دی 1402