Effect of Microstructure on Static and Dynamic Mechanical Property of a Dual Phase Steel Studied by Shear Punch Testing

Qu, Jinbo; Dabboussi, Wael; Hassani, Farid; Nemes, J. A.; Yue, Steve

doi:10.2355/isijinternational.45.1741

Cited by 28 publications

(7 citation statements)

References 8 publications

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“…Increasing the holding time increases the austenite volume fraction, which then will transform to martensite upon quenching in the water. Therefore, VM increased with increasing intercritical annealing time, as reported by Qu et al 15) and Azizi-Alizamini et al 12) As shown in Fig. 3(b), microstructural feature of the cold-rolled duplex structure is consisted of high density of ferrite/martensite interfaces which can be nucleation sites for austenite formation (Fig.…”

Section: Microstructuressupporting

confidence: 65%

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

2015

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Dual phase (DP) steels have been investigated using a new approach utilizing simple cold-rolling and subsequent intercritical annealing of a martensite-ferrite duplex starting structure. The ferrite grain size and volume fraction of martensite were varied by changing the rolling reduction and intercritical annealing time. Ultrafine grained DP (UFG-DP) steel with an average grain size of about 2 μm was achieved by short intercritical annealing of the 80% cold-rolled duplex microstructure. Tensile testing revealed superior mechanical properties (the ultimate tensile strength of 1 100 MPa and elongation of 13%) for the new DP steel in comparison with the commercially used high strength DP980 steel. The variations in hardness, strength and elongation of the specimens with rolling reduction and intercritical holding time were correlated to microstructural characterizations. The inherent mechanism for strengthening of the DP steel was discussed and the contribution of each strengthening factor was quantitatively calculated. The results showed that the calculated yield strength (430.6 MPa) is very close to the measured value (422 MPa).

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Section: Microstructuressupporting

confidence: 65%

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

2015

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“…elastic loading to the yield point, plastic deformation, and the ultimate load at failure. In a previous study, 14 a linear relationship between the maximum shear punch force (F max , as shown in Fig. 6) and the ultimate tensile strength (UTS) was found.…”

Section: Typical Shear Punch Curvesmentioning

confidence: 66%

Effect of microstructure and chemical composition on dynamic factor of high strength steels

Qu¹,

Dabboussi²,

Nemes³

et al. 2008

Materials Science and Technology

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The high strain rate properties of high strength steels with various microstructures and static strength levels were studied by means of split Hopkinson bar apparatus in shear punch mode. The as received cold rolled sheet steels were subjected to a variety of heat treatment conditions to produce several different microstructures, namely ferrite plus pearlite (FzP), ferrite plus bainite (FzB), ferrite plus martensite (FzM) and ferrite plus bainite and retained austenite (FzBzRA). According to the variation of dynamic factor (ratio of dynamic to static strength) with static strength, two groups of microstructures with two distinct behaviours were identified, i.e. classic dual phase (ferrite plus martensite) and multiphase (including ferrite-pearlite, ferrite-bainite, etc.). It was also observed that the general dependence of microstructure on the dynamic factor was strongly influenced by chemical composition in the case of ferrite plus martensite microstructures.

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“…Using the modified SHPB, Huang et al (2011) developed a dynamic PS method to quantify the dynamic shear properties of Longyou sandstone. This development followed attempts to investigate the dynamic shear response of ductile materials using the SHPB in combination with the PS method, such as metals (Dabboussi and Nemes 2005;Qu et al 2005) and fiber composites (Li et al 2002). Later, shear properties of various rock and rock-like materials such as Fangshan marble (Yao et al 2017) and concrete (Grima et al 2015) were studied by employing the modified SHPB combined with the PS method.…”

Section: Gsmentioning

confidence: 99%

Experimental Study of the Dynamic Shear Response of Rocks Using a Modified Punch Shear Method

Yao

Xia

et al. 2019

Rock Mech Rock Eng

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Cohesion and internal friction angle are the two material parameters used in the Coulomb model to predict rock failure in many rock engineering applications. Although these two parameters have been extensively quantified under static conditions using the direct shear or the triaxial compression methods, the effect of dynamic loading on these parameters is not yet clear. A dynamic punch shear method was proposed by Huang et al. in 2011 to measure the dynamic cohesion of rocks, and the dependence of cohesion on the loading rate has been revealed. To further investigate the effect of dynamic loading on the internal friction angle and thus the complete dynamic shear response of rocks, this method is extended in this study to include the normal stress by applying lateral confinement to a disc specimen. The confinement is realized by enclosing the specimen assembly in a 1.5 inch diameter Hoek cell.The dynamic load is applied by a split Hopkinson pressure bar (SHPB) system, which is modified to ensure that the specimen assembly remains intact in the Hoek cell during pressurization by applying a static axial pre-stress. Three groups of green sandstone specimens under confinements of 0, 10 and 20 MPa are tested with different loading rates.The results show that the dynamic shear strength exhibits significant rate dependency and it thus increases with the loading rate and the normal stress. The dynamic cohesion increases with the loading rate, while the internal friction angle remains constant.

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Effect of Microstructure on Static and Dynamic Mechanical Property of a Dual Phase Steel Studied by Shear Punch Testing

Cited by 28 publications

References 8 publications

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

Effect of microstructure and chemical composition on dynamic factor of high strength steels

Experimental Study of the Dynamic Shear Response of Rocks Using a Modified Punch Shear Method

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