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:
Effect of austenite as a harder second phase on ferrite substructure evolution by intercriticalrolling has been investigated using 0.12C-0.3Si-1.35Mn steel. Slab was reheated at 780°C (ferrite; α +austenite; γ phase region) and rolled with 90% reduction down to 12mm in thickness using laboratorymill. 700°C (ferrite; α + cementite; θ phase region) rolled plate was also prepared to compare with 780°Crolled plate. Microstructure distribution along the plate thickness has been observed in detail by SEMand EBSD. Microstructure showed mixed structure of fine-grained ferrite and elongated ferrite for bothof the plates. The ratio of fine-grained ferrite region was around 50% at the plate surface, however,fine-grained ferrite formation hardly occurred at mid thickness for 700°C rolled plate. FEM analysisrevealed that fine-grained ferrite distribution along the thickness can be well explained by equivalentplastic strain distribution along the plate thickness for 700°C rolled plate. Equivalent plastic strainshowed maximum value near the plate surface due to shear strain component, and it could helpsubstructure evolution and fine grained ferrite formation. On the other hand, the ratio of fine-grainedferrite region reached to 50% all through the thickness for 780°C rolled plate. Austenite as a hardersecond phase seems to promote ferrite substructure evolution even at mid thickness of the plate
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.558-559.607.pdf
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