کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7975620 1514689 2016 25 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of subsurface microstructure on the bendability of ultrahigh-strength strip steel
ترجمه فارسی عنوان
تأثیر ریزساختار زیربخش بر خمشی فولاد نوار برشی با شدت بالا
کلمات کلیدی
تغییر شکل آستنیت، رفع مستقیم، انعطاف پذیری، بافت، محلی سازی فشار، سختی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
چکیده انگلیسی
The bendability of thermomechanically rolled and direct-quenched martensitic - bainitic ultrahigh-strength steels can be very anisotropic. Unlike in most steels, it can be good when the bend axis is parallel to the rolling direction but poor when the bend axis is perpendicular to the rolling direction as a result of shear band formation. This paper shows how bendability can be significantly improved and made more isotropic by modifying the subsurface microstructure to include a relatively soft polygonal ferrite and granular bainite layer. It is shown that the thickness of this layer should be at least 300 μm to prevent shear band formation and thereby improve bendability during transverse bending. The results are interpreted in terms of the opposing effects of geometric softening and the strain hardening of the different subsurface microstructures. The role of subsurface shear texture in explaining the anisotropic nature of geometric softening and shear band formation is discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 654, 27 January 2016, Pages 151-160
نویسندگان
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