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Article: The Formation of Microstructures in Cold Rolled Interstitial-Free Steel

TitleThe Formation of Microstructures in Cold Rolled Interstitial-Free Steel
Authors
Issue Date2003
PublisherM A I K Nauka - Interperiodica. The Journal's web site is located at http://www.maik.rssi.ru/journals/physmet.htm
Citation
Physics Of Metals And Metallography, 2003, v. 96 SUPPL., p. S16-S27 How to Cite?
AbstractThe development of the cold rolling microstructure in an Interstitial-Free (IF) steel has been systematically investigated using transmission electron microscopy (TEM). The microstructure originally develops 3D dislocation meshes which relax into cells, which refine until microbands form. It is postulated that from then on, deformation concentrates in the microbands, rendering further cell refinement unnecessary. The cells remained ∼1 mm in diameter with a cell misorientation of ∼1° over the strain range 4-50%. The crystallographic measurement and deformation geometry calculation reveal that the habit plane of a microband has the largest Schmid factor; and when one 〈111〉 slip direction is intensively activated in this plane, one set of microbands is formed on this plane. Two sets of microbands form if two 〈111〉 slip directions are strongly, and nearly equally activated. In the case of microband-free crystals, up to 7 slip systems have similar Schmid factors and thus are activated concurrently. This leads to homogeneous deformation and as a result, no microbands form. The process of forming microbands is considered to arise from a dense dislocation sheet containing positive and negative Burgers vectors so that net rotation is almost zero across the wall of dislocations. An instability and unbalancing of this situation leads to the formation of a second wall of one sign, leaving the original wall with the opposite sign net Burgers vector. This is consistent with the fact that the interior of the microband is rotated away from identical neighboring matrices. At rolling reduction of ∼50% shear bands form on the same slip systems as one set of microbands. Shear banding involves two deformation mechanisms; dislocation gliding and rigid-body rotation. Dislocation gliding mechanism makes shear bands parallel to one set of microbands.
Persistent Identifierhttp://hdl.handle.net/10722/174059
ISSN
2015 Impact Factor: 0.794
2015 SCImago Journal Rankings: 0.650
References

 

DC FieldValueLanguage
dc.contributor.authorChen, QZen_US
dc.contributor.authorDuggan, BJen_US
dc.date.accessioned2012-11-14T06:20:27Z-
dc.date.available2012-11-14T06:20:27Z-
dc.date.issued2003en_US
dc.identifier.citationPhysics Of Metals And Metallography, 2003, v. 96 SUPPL., p. S16-S27en_US
dc.identifier.issn0031-918Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/174059-
dc.description.abstractThe development of the cold rolling microstructure in an Interstitial-Free (IF) steel has been systematically investigated using transmission electron microscopy (TEM). The microstructure originally develops 3D dislocation meshes which relax into cells, which refine until microbands form. It is postulated that from then on, deformation concentrates in the microbands, rendering further cell refinement unnecessary. The cells remained ∼1 mm in diameter with a cell misorientation of ∼1° over the strain range 4-50%. The crystallographic measurement and deformation geometry calculation reveal that the habit plane of a microband has the largest Schmid factor; and when one 〈111〉 slip direction is intensively activated in this plane, one set of microbands is formed on this plane. Two sets of microbands form if two 〈111〉 slip directions are strongly, and nearly equally activated. In the case of microband-free crystals, up to 7 slip systems have similar Schmid factors and thus are activated concurrently. This leads to homogeneous deformation and as a result, no microbands form. The process of forming microbands is considered to arise from a dense dislocation sheet containing positive and negative Burgers vectors so that net rotation is almost zero across the wall of dislocations. An instability and unbalancing of this situation leads to the formation of a second wall of one sign, leaving the original wall with the opposite sign net Burgers vector. This is consistent with the fact that the interior of the microband is rotated away from identical neighboring matrices. At rolling reduction of ∼50% shear bands form on the same slip systems as one set of microbands. Shear banding involves two deformation mechanisms; dislocation gliding and rigid-body rotation. Dislocation gliding mechanism makes shear bands parallel to one set of microbands.en_US
dc.languageengen_US
dc.publisherM A I K Nauka - Interperiodica. The Journal's web site is located at http://www.maik.rssi.ru/journals/physmet.htmen_US
dc.relation.ispartofPhysics of Metals and Metallographyen_US
dc.titleThe Formation of Microstructures in Cold Rolled Interstitial-Free Steelen_US
dc.typeArticleen_US
dc.identifier.emailDuggan, BJ: bjduggan@hkucc.hku.hken_US
dc.identifier.authorityDuggan, BJ=rp01686en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-1642281190en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-1642281190&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume96en_US
dc.identifier.issueSUPPL.en_US
dc.identifier.spageS16en_US
dc.identifier.epageS27en_US
dc.publisher.placeRussian Federationen_US
dc.identifier.scopusauthoridChen, QZ=8353179600en_US
dc.identifier.scopusauthoridDuggan, BJ=7005772998en_US

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