کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1573004 1514667 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of partial and full austenitisation on microstructure and mechanical properties of quenching and partitioning steel
ترجمه فارسی عنوان
اثر استحکام بخشی جزئی و کامل بر ریزساختار و خواص مکانیکی فولاد خنک کننده و پارتیشن بندی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
چکیده انگلیسی
A novel high-strength steel has been made through thermo-mechanical controlled processing with the finish rolling temperature of 750 °C followed by air cooling. Subsequently, both partial austenitisation at 800 °C and fully austenitisation at 930 °C have been attempted for equal duration of 30 min prior to one step quenching and partitioning (Q&P) at 345 °C below MS temperature (365 °C). As-rolled steel reveals ferrite-bainite-martensite microstructures with a good combination of strength and ductility. After Q&P, all the specimens have exhibited the multiphase microstructures comprising ferrite, lath microstructure (martensite and bainite), and retained austenite with the volume fractions of up to 10.50 wt%. It is evident that partitioning for 30 min leads to good carbon enrichment (>1 wt%) of the austenite phase from the neighbouring martensite or bainite which might be due to fast partitioning kinetics and possible suppression of carbides through a combination of Si and Al additions. The attractive combination of tensile strength (921-922 MPa) and ductility (25-26% total elongation) along with low yield ratio (0.63-0.69) are attributed to ferrite and lath microstructures along with the thin film like carbon enriched retained austenite obtained after Q&P process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 676, 31 October 2016, Pages 56-64
نویسندگان
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