کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1579523 | 1514829 | 2010 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ultrahigh strength and low yield ratio of niobium-microalloyed 900Â MPa pipeline steel with nano/ultrafine bainitic lath
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Ultrahigh strength and low yield ratio of niobium-microalloyed 900Â MPa pipeline steel with nano/ultrafine bainitic lath Ultrahigh strength and low yield ratio of niobium-microalloyed 900Â MPa pipeline steel with nano/ultrafine bainitic lath](/preview/png/1579523.png)
چکیده انگلیسی
An ultra-low carbon niobium-microalloyed steel with yield strength of â¼900 MPa has been processed on a pilot-plant scale. The microstructure of the steel is primarily characterized by lower bainite and acicular ferrite, with small fraction of lath-martensite and martensite-austenite (MA) constituents. Bainite is present as fine domains. A combination of niobium and titanium precipitates was observed at the grain boundaries and in the interior of the grains and includes irregular (â¼40-150 nm of (Nb, Ti)(C, N)) and fine cuboidal/spherical particles of NbC (â¼30-50 nm). It was observed that accelerated cooling inhibited the precipitation of Nb and Ti carbides. The Charpy impact toughness at â20 °C was 200 J and tensile elongation was 15% with the yield ratio of less than 0.84. The good matching of high strength and low yield ratio was realized by two-stage thermo-mechanical rolling combined with fast cooling.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 527, Issues 16â17, 25 June 2010, Pages 3886-3892
Journal: Materials Science and Engineering: A - Volume 527, Issues 16â17, 25 June 2010, Pages 3886-3892
نویسندگان
Aimin Guo, R.D.K. Misra, Jinqiao Xu, Bin Guo, S.G. Jansto,