Effect of heat treatment path on the cold formability of drawn dual-phase steels

Park, Kyong Su; Park, Kyung‐Tae; Lee, Duk Lak; Lee, Chong Soo

doi:10.1016/j.msea.2006.02.243

Cited by 49 publications

(31 citation statements)

References 9 publications

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“…Different combinations of strengths and ductilities were obtained with these morphologies in dual-phase microstructures (Ref 8,9). In tensile testing low carbon martensite particles are plastically deformed before fracture and play a vital role in controlling the ductility of DPS ( Ref 5,8). In the present work, the straining behaviors were observed with different morphologies of high carbon martensite.…”

Section: Introductionmentioning

confidence: 62%

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Effect of Martensite Morphology on Tensile Deformation of Dual-Phase Steel

Ahmad

Manzoor

Ziai

et al. 2011

J. of Materi Eng and Perform

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Three morphologies of martensite in dual-phase microstructure of 0.2% C steel were obtained by different heat treatment cycles. These morphologies consisting of grain boundary growth, scattered laths, and bulk form of martensite have their distinct patterns of distribution in the matrix (ferrite). In tensile testing martensite particles with these distributions behaved differently. A reasonable work hardening was gained initially during plastic deformation of the specimens. The control on ductility was found to depend on the alignment of martensite particles along the tensile axes. The increased surface area contact of martensite particles with ferrite, in grain boundary growth and scattered lath morphologies, facilitated stress transfer from ductile to hard phase. The ductility in the later part of deformation was dependent on the density of microvoids in the necked region. The microvoids are formed mostly by de-cohesion of martensite particles at the interface. The fracture of martensite particles is less prominent in the process of microvoid formation which predicts high strength of martensite.

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Section: Introductionmentioning

confidence: 62%

“…Previously with different morphologies, martensite particles are plastically deformed in the later part of tensile testing (Ref 5,8). This may be due to low carbon contents of steel and martensite because strength of martensite is largely dependent on its carbon content.…”

Section: Tensile Fracturementioning

confidence: 99%

Effect of Martensite Morphology on Tensile Deformation of Dual-Phase Steel

Ahmad

Manzoor

Ziai

et al. 2011

J. of Materi Eng and Perform

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show abstract

“…Finer ferritic grain size, higher carbon content in martensite, and higher volume fraction of martensitic islands principally increase strength of DP steels. However, these factors deteriorate their ductility [7][8][9][10]. Kuang et al [11] reported that an appropriate proportion of the two phases is the key factor for the favorable properties of DP steels.…”

Section: Introductionmentioning

confidence: 99%

Microstructure based prediction of strain hardening behavior of dual phase steels

2012

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“…In order to get the ideal martensite volume fraction, the intercritical annealing temperature, holding time and cooling rate must be controlled. Many investigations have been conducted on the low-carbon low-alloy DP steels, containing 20-25% volume fraction martensite [1][2][3][4] . Low-carbon DP steels with high-content martensite have also been investigated recently 5 .…”

Section: Introductionmentioning

confidence: 99%

Study on microstructures and work hardening behavior of ferrite-martensite dual-phase steels with high-content martensite

Zuo

Chen²,

Wang³

2012

Mat. Res.

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A kind of medium-carbon low-alloy dual-phase steels with high-content martensite produced by intercritical annealing at 785-830 °C for 10-50 minutes were studied in aspect of microstructures and work hardening behavior using SEM and tensile testing machine. The experimental results showed that the work hardening of the studied steels obeyed the two-stage work hardening mechanism, whose work hardening exponent of the first stage was higher than that of the second stage. The work hardening exponent increased with increasing the intercritical annealing temperature and time. For series A steel intercritically annealed at 785 °C with starting microstructure of ferrite plus pearlite, austenite nucleated at the pearlite colonies, so the holding time of only 50 minutes can increase the work hardening exponent obviously. For series B steel with starting microstructure of martensite, austenite nucleated at lath interfaces, lath colony boundaries of primary martensite and carbides, accelerating the formation of austenite, so holding time for 30 minutes made the work hardening exponent increase obviously. High work hardening rate during initial plastic deformation (<0.5% strain) was observed.

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Effect of heat treatment path on the cold formability of drawn dual-phase steels

Cited by 49 publications

References 9 publications

Effect of Martensite Morphology on Tensile Deformation of Dual-Phase Steel

Effect of Martensite Morphology on Tensile Deformation of Dual-Phase Steel

Microstructure based prediction of strain hardening behavior of dual phase steels

Study on microstructures and work hardening behavior of ferrite-martensite dual-phase steels with high-content martensite

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