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:
It is well known that the refinement of grain size in metals leads to a significantimprovement in specific mechanical properties. Processing schedules have been investigated aimedat producing an homogeneous ultra-fine ferrite and spheroidised carbide aggregate microstructure inhigh carbon (CMn) steels (0.6-1.2wt%C), via conventional ‘warm’ rolling and innovative EqualChannel Angular Extrusion (ECAE). Suitable deformation schedules were determined fromdilatometry and thermo-mechanical Gleeble simulations. Evidence of an ultra-fine ferrite andcarbide aggregate microstructure following ‘warm’ rolling was observed. A significantimprovement in tensile strength, particularly proof stress was also noted in comparison to materialdeformed at higher temperatures. Concurrent ECAE experiments investigated microstructuralevolution with incremental strain. Extensive analysis was carried out using various techniques,including high resolution Electron Back Scattered Diffraction (EBSD). Evidence of ferrite grainrefinement was noted in a eutectoid composition steel. A sub-micron ferrite structure was observedfollowing high strains (ε~3.33) and the mechanical properties exhibited a marked increase in tensilestrength
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.550.301.pdf
