بررسی اثر افزودن نیوبیوم بر رفتار کارگرم فولاد زنگ نزن مارتنزیتی 403 AISI

محورهای موضوعی : فرآیندهای شکل دهی فلزات و ترمومکانیکال

سعید علی اکبری ثانی ¹ (دانشگاه علم و صنعت ایران)
غلامرضا ابراهیمی ² (گروه مهندسی مواد و پلیمر-دانشکده مهندسی-دانشگاه حکیم سبزواری)

تاریخ دریافت : 1394/07/26 تاریخ پذیرش : 1394/09/30 تاریخ انتشار : 1394/09/01

کلید واژه: فولاد 403AISI, عملیات ترمومکانیکال, DRX, آزمون رهایی تنش, رسوبات کاربید نیوبیوم,

چکیده مقاله :

با توجه به اثرات مهم عنصر نیوبیوم بر خواص نهایی فولادها، تحقیق حاضر به بررسی افزودن نیوبیوم بر رفتار کارگرم فولاد زنگ نزن مارتنزیتی 403 AISI پرداخته است. بدین منظور دو فولاد 403 و Nb403 تحت آزمون‌های فشار گرم قرار گرفتند. نتایج منحنی‌های سیلان نشان می‌دهد که در تمام شرایط کارگرم ِفولاد 403 و در بسیاری از شرایط در فولاد Nb403، پدیده تبلور مجدد دینامیکی (DRX)، کنترل کننده رفتار آلیاژها است. هرچند در فولاد Nb403 و تنها در بعضی از شرایط دمای پایین، به واسطه حضور عنصر نیوبیوم و رسوبات کاربیدی آن و اندرکنش مابین آنها با تبلور مجدد، DRX متوقف شده است. با استفاده از نتایج آزمون رهایی تنش، پدیده رسوب‌دهی مورد بررسی قرار گرفت و مشخص شد که رسوبات توانایی به تعویق انداختن ترمیم را دارند. تصویر SEM و آنالیز EDS از رسوبات حضور کاربید نیوبیوم‌ را اثبات کرد.

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