Microstructural effects on the springback of advanced high-strength steel

Wang, Gan; Babu, S. S.; Kapustka, Nick; Wagoner, R. H.

doi:10.1007/bf02586157

Cited by 51 publications

(26 citation statements)

References 42 publications

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“…This allows the steels to be downgauged, thereby reducing overall part weight. [2] Dual-phase (DP) steels are one of the commonly used AHSS grades being adopted by automakers. DP steels derive their strength from a composite microstructure comprising ferrite, martensite, and bainite.…”

Section: Introductionmentioning

confidence: 99%

Softening Kinetics in the Subcritical Heat-Affected Zone of Dual-Phase Steel Welds

Biro

McDermid

Embury

et al. 2010

Metall Mater Trans A

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Welds in dual-phase (DP) steels exhibit heat-affected zone (HAZ) softening in which the tempered or subcritical HAZ exhibits a lower hardness vs that of the parent material. The rate of this softening reaction with respect to welding heat input was determined for four DP steels by making several bead-on-plate laser welds using a variety of heat inputs and measuring the resulting minimum hardness. The reduction in hardness was then fit to the Avrami equation, enabling a comparison of the relative heat needed to soften each steel. It was found that the heat input required for HAZ softening decreased as the C content of the martensite within the DP structure increased. However, the presence of carbide forming alloying elements such as Cr and Mo was able to increase resistance to softening.

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Section: Introductionmentioning

confidence: 99%

Softening Kinetics in the Subcritical Heat-Affected Zone of Dual-Phase Steel Welds

Biro

McDermid

Embury

et al. 2010

Metall Mater Trans A

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show abstract

“…Driven by a good combination of strength and ductility, multiphase steels such as transformation-induced-plasticity (TRIP)-assisted steels and dual-phase (DP) steels have attracted much interest in the past decade [2][3][4]. These steels exhibit complex microstructures consisting of a ferrite matrix and a dispersion of multiphase grains, such as bainite, martensite and austenite.…”

Section: Introductionmentioning

confidence: 99%

An in situ high-energy X-ray diffraction study of micromechanical behavior of multiple phases in advanced high-strength steels

et al. 2009

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“…One of the families of AHSS being adopted for structural applications in significant quantities are the dual-phase (DP) steels. 2) DP steels have a composite microstructure comprising martensite islands within a ferrite matrix, where the strength of the steel generally increases with increasing volume fractions of martensite.…”

Section: Introductionmentioning

confidence: 99%

Predicting Transient Softening in the Sub-Critical Heat-Affected Zone of Dual-Phase and Martensitic Steel Welds

et al. 2013

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To improve vehicle fuel economy and crash worthiness the automotive industry has been redesigning parts from advanced high strength steels such as dual-phase and martensitic steels. These steels have high strengths with the higher formability characteristics when compared to lower strength conventional steels of similar ductility. These steels derive their unique properties from their complex microstructures containing ferrite and martensite. During assembly welding, the martensite within the sub-critical region of the heat-affected zone tempers, which locally reduces mechanical properties. Although this phenomenon is well studied, it has yet to be quantified. The present work proposes a technique to measure the softening kinetics of dual-phase and martensite steels using rapid isothermal tempering. The resulting model was then validated by predicting the heat-affect zone softening that occurs in laser and resistance spot welds as well as by comparing the microstructures of the rapid tempered samples to the microstructures found in the sub-critical heat-affected zone of welded samples.

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Microstructural effects on the springback of advanced high-strength steel

Cited by 51 publications

References 42 publications

Softening Kinetics in the Subcritical Heat-Affected Zone of Dual-Phase Steel Welds

Softening Kinetics in the Subcritical Heat-Affected Zone of Dual-Phase Steel Welds

An in situ high-energy X-ray diffraction study of micromechanical behavior of multiple phases in advanced high-strength steels

Predicting Transient Softening in the Sub-Critical Heat-Affected Zone of Dual-Phase and Martensitic Steel Welds

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