ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The multiphase steels have complex microstructures containing polygonal ferrite,martensite, bainite, carbide and a small amount of retained austenite. This microstructure providesthese steels with a high mechanical strength and good ductility. Different thermal cycles weresimulated in the laboratory in order to create the microstructures with improved mechanicalproperties. The samples were heated to various annealing temperatures (740, 760 or 780°C), heldfor 300 s, and then quickly cooled to 600 or 500°C, where they were soaked for another 300 s andthen submitted to the accelerated cooling process, with the rates in the range of 12-30°C/s. Themicrostructure was examined at the end of each processing route. The mechanical behaviorevaluation was made by microhardness testing. The microstructural characterization involvedoptical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM) withelectron backscattering diffraction (EBSD) and transmission electron microscopy (TEM). The useof multiple regression analysis allowed the establishment of quantitative relationship between themicrostructural parameters, cooling rates and mechanical properties of the steel
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.4375.pdf
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