کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7881473 1509599 2014 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fabrication of an ultrafine-grained structure by a compositional pinning technique
ترجمه فارسی عنوان
ساخت یک ساختار فوق سنگی با استفاده از تکنیک ترکیب پودینگ
کلمات کلیدی
پارتیشن بندی آلیاژ، پیوند ترکیبی دانه فوق العاده ای طول عمر محصول، جریحه دار
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی
A new metallurgical process for fabricating ultrafine-grained alloys by a compositional pinning technique is proposed. A Fe-10Mn-0.2C alloy was prepared by vacuum induction melting, and the substitutional alloying element Mn was partitioned by annealing in the austenite + ferrite region. After the partitioning, specimens were reheated to austenite temperature and cooled at varying cooling rates or cold rolled and recrystallized. Specimens quenched or slowly cooled after reheating showed ferrite-plus-austenite layered structures, while cold-rolled and recrystallized specimens showed equiaxed grain structures of ferrite plus austenite. The average grain size (or layer thickness) was <1 μm. The Mn-enriched region survived the reheat annealing and effectively acted as a barrier to ferrite growth. The quench and tempered specimens showed continuous yielding behavior, while the cold-rolled and recrystallized ones showed discontinuous yielding and serrated flow. The steels all showed excellent combinations of strength and ductility, yield strength >700 MPa and tensile strength >1100 MPa. Tensile elongation was the shortest, ∼20%, in quench and tempered steel, and was ∼40% in slowly cooled or cold-rolled and recrystallized steels. Possible reasons for the difference in tensile behavior are discussed. This technique opens a new way for the industrial production of various grades of ultrafine-grained alloys through a modification of the alloy composition and thermomechanical processing route.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 77, 15 September 2014, Pages 236-247
نویسندگان
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