مهندسی ساخت و تولید ایران

مهندسی ساخت و تولید ایران

بررسی ریزساختار و خواص مکانیکی فولاد Delta-Trip حاوی وانادیم

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی دکتری، دپارتمان فناوری نانو و مواد پیشرفته، پژوهشگاه مواد انرژی، کرج، ایران
2 استادیار، دپارتمان فناوری نانو و مواد پیشرفته، پژوهشگاه مواد انرژی، کرج، ایران
3 دانشیار، دپارتمان فناوری نانو و مواد پیشرفته، پژوهشگاه مواد انرژی، کرج، ایران
چکیده
تأثیر عناصر میکرو آلیاژی بر خواص فولادهای استحکام بالا، توسط محققان زیادی بررسی‌شده است. وانادیم به علت تأثیر مثبت در استحکام دهی محلول جامد، استحکام‌بخشی رسوب سختی و بهبود ریزدانگی، از اهمیت بالایی برخوردار است ولی به‌صورت مستقل تأثیر این عنصر بر خواص فولاد delta-Trip بررسی نشده است از این‌رو در تحقیق حاضر، تأثیر افزودن عنصر وانادیم در مقادیر 0/12 و 0/25 درصد وزنی بر خواص مکانیکی و ریزساختار فولاد delta-Trip بررسی ‌شده است. ساختار هر سه فولاد قبل از عملیات حرارتی حاوی فازهای فریت دلتا، فریت آلوتروپیک، مارتنزیت و پرلیت بود و سیکل عملیات حرارتی منجر به پایداری فاز آستنیت گردید. افزودن 0/12 درصد وزنی وانادیم، باعث بهبود خواص مکانیکی شده و بهترین ترکیب استحکام و ازدیاد طول را با استحکام 866 مگا پاسکال و ازدیاد طول 41 درصد ایجاد کرده است. افزایش بیشتر وانادیم تا 0/25 درصد، تأثیر منفی بر خواص مکانیکی داشت. افزایش مقدار وانادیم با تشویق تشکیل فاز مارتنزیت و کاهش درصد آستنیت باقی ‌مانده، خواص مکانیکی را تضعیف کرد؛ ولی مقدار 12/0 درصد وانادیم با افزایش استحکام از طریق استحکام دهی ناشی از محلول جامد و رسوب سختی، عدم ایجاد ساختار ترد مارتنزیتی و ایجاد ساختار لایه‌ای فریت دلتا، منجر به بهبود خواص مکانیکی شد. فولاد 0/12 درصد وانادیم با شاخص شکل‌پذیری MPa.% 35700 در محدوده‌ی فولادهای پیشرفته استحکام بالا نسل سوم قرار می‌گیرد.
کلیدواژه‌ها

عنوان مقاله English

Investigating the microstructure and mechanical properties of vanadium bearing Delta-Trip Steel

نویسندگان English

Yaser Emamian 1
AliReza Kollahi 2
Yahya Palizdar 3
1 PhD Student, Nanotechnology and Advanced Materials Department, Materials and Energy Research Center, Karaj, Iran
2 Assistant Professor, Nanotechnology and Advanced Materials Department, Materials and Energy Research Center, Karaj, Iran
3 Associate Professor, Nanotechnology and Advanced Materials Department, Materials and Energy Research Center, Karaj, Iran
چکیده English

Many researchers have investigated the effect of alloying elements on the properties of high-strength steels. Vanadium is of great importance due to its positive effect on solid solution strengthening, precipitation hardening, and grain boundary refinement, but the effect of this element on the properties of delta-trip steel has not been investigated independently, therefore, in this reserch, the effect of adding 0.12 and 0.25 wt.% vanadium on the microstructure and mechanical properties of a Delta-TRIP steel has been studied.  The structure of the three steels before applying the heat treatment cycle consisted of delta-ferrite, allotriomorphic ferrite, martensite, and pearlite. The heat treatment cycle led to the stability of the austenite phase. The addition of 0.12 wt.% V resulted in the enhancement of the mechanical properties so that the best combination of strength (866 MPa) and elongation percentage (41%) was achieved in this steel. Nonetheless, the addition of 0.25 wt.% V deteriorated the mechanical properties since the increase in the vanadium content promoted the formation of martensite, decreased the percentage of the retained austenite, and weakened the mechanical properties. However, adding 0.12 wt.% V improved the mechanical properties since it increased the strength through solid-solution strengthening and precipitation hardening; no brittle martensite was formed, and lamellar δ-ferrite was achieved. The steel containing 0.12 wt.% V, exhibiting a formability index of 35700 MPa%, is in the range of third-generation advanced high-strength steels.

کلیدواژه‌ها English

Delta-Trip Steel
Vanadium
Heat Treated
Formability Index
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