Damage mechanisms and mechanical properties of high-strength multiphase steels

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dc.contributor.authorClausmeyer, Till
dc.contributor.authorTekkaya, A. Erman
dc.contributor.authorHeibel, Sebastian
dc.contributor.authorDettinger, Thomas
dc.contributor.authorNester, Winfried
dc.date.accessioned2019-12-13T13:13:49Z
dc.date.available2019-12-13T13:13:49Z
dc.date.issued2018-05-09
dc.description.abstractThe usage of high-strength steels for structural components and reinforcement parts is inevitable for modern car-body manufacture in reaching lightweight design as well as increasing passive safety. Depending on their microstructure these steels show differing damage mechanisms and various mechanical properties which cannot be classified comprehensively via classical uniaxial tensile testing. In this research, damage initiation, evolution and final material failure are characterized for commercially produced complex-phase (CP) and dual-phase (DP) steels in a strength range between 600 and 1000 MPa. Based on these investigations CP steels with their homogeneous microstructure are characterized as damage tolerant and hence less edge-crack sensitive than DP steels. As final fracture occurs after a combination of ductile damage evolution and local shear band localization in ferrite grains at a characteristic thickness strain, this strain measure is introduced as a new parameter for local formability. In terms of global formability DP steels display advantages because of their microstructural composition of soft ferrite matrix including hard martensite particles. Combining true uniform elongation as a measure for global formability with the true thickness strain at fracture for local formability the mechanical material response can be assessed on basis of uniaxial tensile testing incorporating all microstructural characteristics on a macroscopic scale. Based on these findings a new classification scheme for the recently developed high-strength multiphase steels with significantly better formability resulting of complex underlying microstructures is introduced. The scheme overcomes the steel designations using microstructural concepts, which provide no information about design and production properties.en
dc.identifier.urihttp://hdl.handle.net/2003/38433
dc.identifier.urihttp://dx.doi.org/10.17877/DE290R-20364
dc.language.isoende
dc.relation.ispartofseriesMaterials;Jg. 11, Heft: 5 | S. 761-1-761-34
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectDamageen
dc.subjectAHSSen
dc.subjectUHSSen
dc.subjectGlobal formabilityen
dc.subjectLocal formabilityen
dc.subjectDamage toleranceen
dc.subjectBendabilityen
dc.subjectFractureen
dc.subjectDamage mechanicsen
dc.subjectEdge-crack sensitivityen
dc.subject.ddc620
dc.subject.ddc670
dc.subject.rswkWerkstoffschädigungde
dc.subject.rswkKohlenstoffstahlde
dc.subject.rswkUltrahochfester Stahlde
dc.subject.rswkFormänderungsvermögende
dc.subject.rswkSchadenstoleranzde
dc.subject.rswkBiegefestigkeitde
dc.subject.rswkBruchde
dc.subject.rswkSchadensmechanikde
dc.subject.rswkRissde
dc.titleDamage mechanisms and mechanical properties of high-strength multiphase steelsen
dc.typeTextde
dc.type.publicationtypearticlede
dcterms.accessRightsopen access
eldorado.secondarypublicationtruede
eldorado.secondarypublication.primarycitationMaterials : Jg. 11. 2018, Heft 5 | S. 761-1-761-34de
eldorado.secondarypublication.primaryidentifierhttps://doi.org/10.3390/ma11050761de

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