کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10620235 988604 2013 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A novel thermomechanical approach to produce a fine ferrite and low-temperature bainitic composite microstructure
ترجمه فارسی عنوان
یک رویه ترمومکانیکی جدید برای تولید یک فرایند خوب و ریزساختار کامپوزیت بیینیت کم دما
کلمات کلیدی
پردازش حرارتی مکانیکی، فریت خوب باینیت کم دما، توموگرافی پروب اتم میکروسکوپ الکترونی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی
A novel thermomechanical processing was developed in the present study to produce a unique microstructure consisting of fine ferrite grains (i.e. ∼4 μm on average) and low-temperature bainite in a relatively low-carbon steel with a modest hardenability. The thermomechanical route consisted of warm deformation of supercooled austenite followed by reheating in the ferrite region and then cooling to the bainitic transformation regime (i.e. 400-200 °C). The low-temperature bainite consisted of high dislocation density bainitic laths and very fine retained austenite films. This microstructure offered a high work hardening rate leading to a unique combination of ultimate tensile strength and elongation. This was due to the presence of ductile fine ferrite grains and hard low-temperature bainitic ferrite laths with retained austenite films. The microstructural characteristics of bainite were studied using optical microscopy in conjunction with scanning and transmission electron microscopy, electron backscatter diffraction and atom probe tomography techniques.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 61, Issue 19, November 2013, Pages 7240-7250
نویسندگان
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