کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1578110 1514815 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Precipitation behavior during thin slab thermomechanical processing and isothermal aging of copper-bearing niobium-microalloyed high strength structural steels: The effect on mechanical properties
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Precipitation behavior during thin slab thermomechanical processing and isothermal aging of copper-bearing niobium-microalloyed high strength structural steels: The effect on mechanical properties
چکیده انگلیسی

We describe here the precipitation behavior of copper and fine-scale carbides during thermo-mechanical processing and isothermal aging of copper-bearing niobium-microalloyed high strength steels. During thermo-mechanical processing, precipitation of ɛ-copper occurs in polygonal ferrite and at the austenite–ferrite interface. In contrast, during isothermal aging, nucleation of ɛ-copper precipitation occurs at dislocations. In the three different chemistries investigated, the increase in strength associated with copper during aging results only in a small decrease in impact toughness, implying that copper precipitates do not seriously impair toughness, and can be considered as a viable strengthening element in microalloyed steels. Precipitation of fine-scale niobium carbides occurs extensively at dislocations and within ferrite matrix together with vanadium carbides. In the presence of titanium, titanium carbides act as a nucleus for niobium carbide formation. Irrespective of the nature of carbides, copper precipitates and carbides are mutually exclusive.


► Copper does not significantly influence toughness.
► Copper precipitation during aging occurs at dislocations.
► Precipitation of copper and carbides is mutually exclusive.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 528, Issues 29–30, 15 November 2011, Pages 8772–8780
نویسندگان
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