Correlation of ferrite and martensite micromechanical behavior with mechanical properties of ultrafine grained dual phase steels

Jahanara, Amir Hossein; Mazaheri, Yousef; Sheikhi, Mohsen

doi:10.1016/j.msea.2019.138206

Cited by 36 publications

(32 citation statements)

References 56 publications

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“…Therefore, the work-hardening plot of the hot-rolled sample showed a negative value, indicating lower work-hardening capacity. [33] It is also to be noted that irrespective of the different conditions (i.e., with or without hot rolling), the slope of the lnðdr=deÞ vs. ln e ð Þ plot, between YS and UTS remains negative. However, the absolute value of the slope varies.…”

Section: Discussionmentioning

confidence: 98%

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Bansal

Jena

Ghosh

et al. 2020

Metall Mater Trans A

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The present study demonstrates the role of hot rolling and quench temperature in determining the mechanical properties of low alloy steel processed through quenching and nonisothermal partitioning (Q&P) route. The results indicate that the abrasive wear resistance does not show any significant variation with quench temperature. However, a reduction in tensile strength and an increase in charpy impact toughness and elongation is observed with increasing quench temperature. Interestingly, the retained austenite shows high thermal stability at sub-zero temperature. Furthermore, during deformation through the wear process, the retained austenite experiences the TRIP effect that leads to improvement in wear resistance. The incorporation of hot rolling prior to Q&P led to a significant improvement in strength, energy absorption capability and wear resistance due to a considerable refinement of the microstructural constituents.

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Section: Discussionmentioning

confidence: 98%

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Bansal

Jena

Ghosh

et al. 2020

Metall Mater Trans A

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“…The YS of the DP steel is closely correlated with ferrite yielding [10], which itself is influenced by some parameters such as grain size, precipitation state, dislocation density, and atoms in solid solution. It is well known that a finer ferrite grain, d f , results in a higher yield stress [15].…”

Section: Tensile Behaviormentioning

confidence: 99%

“…Mechanical properties of DP steels arise from the dispersion of a hard phase (martensite) in a ductile matrix (ferrite) and all the related phenomena that accompany this coexistence [8,9]. For instance, it is known that the UTS is closely related to the work hardening behavior of the DP steel (especially of the ferrite phase), which comprises different stages: (i) motion of the stored dislocations and rapid work hardening of ferrite, (ii) constraint of plastic flow of ferrite by martensite; (iii) yielding of martensite and occurrence of plastic deformation in both ferrite and martensite phases [10,11]. However, martensite never reaches its UTS when the necking of DP steels occurs [12].…”

Section: Introductionmentioning

confidence: 99%

Low-carbon cast microalloyed steel intercritically heat-treated at different temperatures: microstructure and mechanical properties

Torkamani

Raygan

García‐Mateo

et al. 2021

Archiv.Civ.Mech.Eng

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In this study, dual-phase (DP, ferrite + martensite) microstructures were obtained by performing intercritical heat treatments (IHT) at 750 and 800 °C followed by quenching. Decreasing the IHT temperature from 800 to 750 °C leads to: (i) a decrease in the volume fraction of austenite (martensite after quenching) from 0.68 to 0.36; (ii) ~ 100 °C decrease in martensite start temperature (Ms), mainly due to the higher carbon content of austenite and its smaller grains at 750 °C; (iii) a reduction in the block size of martensite from 1.9 to 1.2 μm as measured by EBSD. Having a higher carbon content and a finer block size, the localized microhardness of martensite islands increases from 380 HV (800 °C) to 504 HV (750 °C). Moreover, despite the different volume fractions of martensite obtained in DP microstructures, the hardness of the steels remained unchanged by changing the IHT temperature (~ 234 to 238 HV). Applying lower IHT temperature (lower fraction of martensite), the impact energy even decreased from 12 to 9 J due to the brittleness of the martensite phase. The results of the tensile tests indicate that by increasing the IHT temperature, the yield and ultimate tensile strengths of the DP steel increase from 493 to 770 MPa, and from 908 to 1080 MPa, respectively, while the total elongation decreases from 9.8 to 4.5%. In contrast to the normalized sample, formation of martensite in the DP steels could eliminate the yield point phenomenon in the tensile curves, as it generates free dislocations in adjacent ferrite.

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“…With the increase of martensite content, the strength of ferrite increases while the martensite's decreases. The strength of ferrite can be calculated by the formula (Jahanara et al, 2019),…”

Section: Hydrogen Embrittlement Susceptibilitymentioning

confidence: 99%

“…When D eff reached infinity, the concentration of hydrogen captured in the hydrogen traps is almost zero, which results that the I HE approached zero. Previous study has shown that when I HE is over 35%, the material was sensitive to hydrogen embrittlement (Jahanara et al, 2019). We substituted 35% into Eq.…”

Section: Log(i Hementioning

confidence: 99%

Hydrogen Diffusion and Its Effect on Hydrogen Embrittlement in DP Steels With Different Martensite Content

et al. 2020

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The hydrogen diffusion behavior and hydrogen embrittlement susceptibility of dual phase (DP) steels with different martensite content were investigated using the slow strain-rate tensile test and hydrogen permeation measurement. Results showed that a logarithmic relationship was established between the hydrogen embrittlement index (IHE) and the effective hydrogen diffusion coefficient (Deff). When the martensite content is low, ferrite/martensite interface behaves as the main trap that captures the hydrogen atoms. Also, when the Deff decreases, IHE increases with increasing martensite content. However, when the martensite content reaches approximately 68.3%, the martensite grains start to form a continuous network, Deff reaches a plateau and IHE continues to increase. This is mainly related to the reduction of carbon content in martensite and the length of ferrite/martensite interface, which promotes the diffusion of hydrogen atoms in martensite and the aggregation of hydrogen atoms at the ferrite/martensite interface. Finally, a model describing the mechanism of microstructure-driven hydrogen diffusion with different martensite distribution was established.

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Correlation of ferrite and martensite micromechanical behavior with mechanical properties of ultrafine grained dual phase steels

Cited by 36 publications

References 56 publications

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Quench Temperature-Dependent Mechanical Properties During Nonisothermal Partitioning

Low-carbon cast microalloyed steel intercritically heat-treated at different temperatures: microstructure and mechanical properties

Hydrogen Diffusion and Its Effect on Hydrogen Embrittlement in DP Steels With Different Martensite Content

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