بررسی ریزساختار و رفتار سودوالاستیک در آلیاژ Fe-10Ni-7Mn (wt.%) قبل و بعد از اعمال فرایند پیچش تحت فشار بالا

نوع مقاله : مقاله پژوهشی

نویسنده

استادیار، دانشکده مهندسی مواد و متالورژی، دانشگاه علم و صنعت ایران، تهران، ایران

چکیده

در پژوهش حاضر، رفتار سودوالاستیک آلیاژ Fe-10Ni-7Mn (wt.%) قبل و بعد از اعمال فرایند پیچش تحت فشار بالا مورد ارزیابی قرار گرفت. بررسی­های ریزساختاری و آنالیز فازی نشان داد که پس از اعمال فرایند پیچش تحت فشار بالا به میزان 15 دور بر روی نمونه اولیه در شرایط آنیل محلولی، کسر کوچکی از فاز آستنیت فوق ریزدانه با چگالی بالایی از نابجایی­ها در ساختار زمینه مارتنزیتی ایجاد شده و اندازه دانه مارتنزیت به شدت کاهش یافت. در ادامه انجام عملیات حرارتی آنیل همدما در دمای °C 590 در منطقه دو فازی آستنیت-فریت (a+g) و به مدت ks 8/1 بر روی نمونه اولیه و نمونه تغییرشکل شدید یافته، منجر به تشکیل فاز آستنیت برگشتی با میانگین اندازه دانه­های mm 5/6 در ریزساختار نمونه اولیه و nm 360 در ریزساختار نمونه تغییرشکل شدید یافته شد. تشکیل آستنیت برگشتی ریزدانه پس از اعمال فرایند آنیل همدما بر روی نمونه پیچش یافته تحت فشار بالا موجب ایجاد سختی و استحکام نسبتا بالا در ماده گردید. بررسی آزمون کشش سیکلی بر روی آلیاژ در شرایط مختلف نشان داد که آستنیت ایجاد شده در اثر اعمال فرایند پیچش تحت فشار بالا و نیز آستنیت برگشتی ایجاد شده پس از انجام فرایند آنیل همدمای نمونه تغییر شکل شدید یافته، رفتار سودوالاستیک از خود نشان دادند. بیشترین درصد سودوالاستیسیته نمونه پیچش یافته تحت فشار بالا قبل و بعد از انجام عملیات آنیل همدما بترتیب حدود 65% و 45% بدست آمد.   

کلیدواژه‌ها

عنوان مقاله [English]

Study on the microstructure and pseudoelastic behavior in an Fe-10Ni-7Mn (wt.%) alloy before and after high pressure torsion (HPT) processing

نویسنده [English]

  • Hamidreza Koohdar
Assistant Professor, School of Metallurgy and Materials Engineering, Iran University of Science & Technology (IUST), Tehran, Iran
چکیده [English]

In the present research, the pseudoelastic behavior of an Fe-10Ni-7Mn (wt.%) alloy was investigated before and after high pressure torsion (HPT) processing. Microstructural examination and phase analysis confirmed that the HPT processing of the solution-annealed initial specimen for 15 turns led to form a small fraction of the fine grained strain-induced austenite with a high density of dislocations and reduced the grain size of martensite. Then, isothermal annealing treatment on the initial and HPT-processed specimens at 590 °C in dual phase (a+g) region for 1.8 ks introduced the reversed austenite with average grain sizes of 6.5 mm in the microstructure of the initial specimen and 360 nm in the HPT-processed one. Forming the fine-grained reversed austenite in the microstructure of the HPT-processed specimen after isothermal annealing led to obtain a relatively high hardness and strength. In addition, cyclic tensile testing revealed pseudoelastic behavior of the reversed austenite in the HPT-processed specimen before and after isothermal annealing. Maximum pseudoelasticity values of about 65% and 45% were obtained for HPT-processed specimens before and after isothermal annealing, respectively.

کلیدواژه‌ها [English]

  • Fe-Ni-Mn martensitic steel
  • Microstructure evolution
  • High-pressure torsion
  • Reversed austenite
  • Pseudoelastic behavior

مراجع

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  • تاریخ دریافت: 17 دی 1400
  • تاریخ بازنگری: 23 تیر 1401
  • تاریخ پذیرش: 17 مهر 1401

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