Tailoring the Microstructure and Mechanical Properties of Dual Phase Steel Based on the Initial Microstructure

Kalhor, Alireza; Mirzadeh, Hamed

doi:10.1002/srin.201600385

Cited by 35 publications

(21 citation statements)

References 33 publications

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“…The initial material was a cold rolled sheet subjected to the normalizing heat treatment and had an equiaxed ferritic‐pearlitic microstructure, as shown in Figure . The A 1 and A 3 temperatures were, respectively, estimated as ≈726 and ≈865 °C based on Trzaska and Park equations as shown in Equation :

\begin{matrix} left \\ center Trzaska \Leftrightarrow A_{1}^{} = 739 - 22.8 C - 6.8 Mn + 18.2 Si + 11.7 Cr - 15 Ni - 6.4 Mo - 5 V - 28 Cu \\ center Park \Leftrightarrow A_{3}^{} = 955 - 350 C - 25 Mn + 51 Si + 106 Nb + 100 Ti + 68 Al - 11 Cr - 33 Ni - 16 Cu + 67 Mo \end{matrix}

…”

Section: Methodsmentioning

confidence: 99%

Refinement of Banded Structure via Thermal Cycling and Its Effects on Mechanical Properties of Dual Phase Steel

Ghaemifar

Mirzadeh

2018

steel research int.

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The microstructural refinement by thermal cycling and its effects on the enhancement of mechanical properties and work-hardening response of a typical C-Mn dual phase (DP) steel having the banded ferritic-martensitic morphology is evaluated. It is revealed that the band spacing is reduced by decreasing austenitization temperature and applying thermal cycles to intercritical region, where a saturated spacing will be reached. This results in the enhancement of work-hardening capacity of DP steels as demonstrated based on the instantaneous (incremental) work-hardening rate exponents, modified Crussard-Jaoul analysis, and evaluating the yield ratio after tensile tests. These observations justify the potential of this simple heat treatment route for microstructural control of DP steels. Figure 8. a) Dependence of UTS and total elongation on band spacing and b) Dependence of yield ratio and UTS-YS on band spacing.www.advancedsciencenews.com www.steel-research.de steel research int. 2018, 89, 1700531

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\begin{matrix} left \\ center Trzaska \Leftrightarrow A_{1}^{} = 739 - 22.8 C - 6.8 Mn + 18.2 Si + 11.7 Cr - 15 Ni - 6.4 Mo - 5 V - 28 Cu \\ center Park \Leftrightarrow A_{3}^{} = 955 - 350 C - 25 Mn + 51 Si + 106 Nb + 100 Ti + 68 Al - 11 Cr - 33 Ni - 16 Cu + 67 Mo \end{matrix}

…”

Section: Methodsmentioning

confidence: 99%

Refinement of Banded Structure via Thermal Cycling and Its Effects on Mechanical Properties of Dual Phase Steel

Ghaemifar

Mirzadeh

2018

steel research int.

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“…After intercritical annealing at 735 8C, the martensite particle sizes are much finer than that produced from full annealed sample (DP1) and they are uniformly dispersed in the microstructure (denoted as DP3), Figure 3. This good distribution leads to a better combination of mechanical properties [11,15,18,28,29], where both DP1 and DP3 steels have total elongation of 35 % but the tensile strength of DP3 is 1.14 times that of DP1, Figure 3. Again by increasing the intercritical annealing temperature from 735 8C to 800 8C (DP4), the strength enhances from 647 MPa to 1091 MPa, Figure 3.…”

Section: The Initial Quenched Microstructurementioning

confidence: 99%

“…One of the heat treatment routes to alter the initial microstructure is the spheroidization treatment, which can produce discrete martensite islands [12,15]. Moreover, the initial banded ferritic-pearlitic microstructure can be used to achieve dual phase steel with banded morphology.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of work‐hardening behavior of dual phase steel by heat treatment

Nasiri

Mirzadeh

2018

Materialwissenschaft Werkst

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The work‐hardening response and mechanical properties of dual phase steels originated from different initial microstructures under low and high martensite volume fractions were investigated using a typical carbon‐manganese steel. The modified Crussard‐Jaoul analysis was used for studying the work‐hardening stages and the deformation behavior of ferrite and martensite. It was revealed that the initial martensitic microstructure before intercritical annealing is much better than the full annealed banded ferritic‐pearlitic and spheroidized microstructures in terms of work‐hardening capacity and strength‐ductility trade off. By increasing the amount of martensite, via intercritical annealing at higher temperatures, the ductility decreased but the tensile toughness of dual phase steels increased toward reaching the domain of extra‐advanced high‐strength steels due to the enhancement of work‐hardening rate.

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“…Grain refinement is a representative strengthening mechanism which is applied to improve the mechanical properties of DP steel . Mirzadeh et al and Karmakar et al found that changing the initial microstructure can significantly affect the final microstructure and mechanical properties of DP steel. Several researchers attempted to predict the properties of DP steel based on the rule of mixture, the finite element simulation as well as the integrated experimental‐simulation method .…”

Section: Introductionmentioning

confidence: 99%

Effects of Continuous Annealing Process Parameters on the Microstructure and Mechanical Properties of Dual Phase Steel

Kong¹,

Zhang²,

Li³

et al. 2018

steel research int.

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Due to the difference in chemistries and manufacturing processes applied, the microstructure and mechanical properties of DP780 steel produced by different production lines may be inconsistent. Annealing experiments are designed and carried out in the laboratory based on the actual industrial production process in order to investigate the effects of continuous annealing process parameters on the microstructure and mechanical properties of DP steel quantitatively. The results show that the effect of intercritical temperature is continuous while the sensitive interval and non-sensitive interval should be considered in terms of the effect of slow cooling temperature, over-aging temperature, and strip speed. The influence degree is defined to quantitatively compare the effects of the influencing factors, which find that the over-aging temperature has the most influential effect on the tensile strength while the effect of the slow cooling temperature ranks second and the intercritical temperature has a minimal impact. The influence degrees on elongation of all the three factors are similar. The results from this study are helpful to efficiently adjust the microstructure and mechanical properties of DP steel.

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Tailoring the Microstructure and Mechanical Properties of Dual Phase Steel Based on the Initial Microstructure

Cited by 35 publications

References 33 publications

Refinement of Banded Structure via Thermal Cycling and Its Effects on Mechanical Properties of Dual Phase Steel

Refinement of Banded Structure via Thermal Cycling and Its Effects on Mechanical Properties of Dual Phase Steel

Enhancement of work‐hardening behavior of dual phase steel by heat treatment

Effects of Continuous Annealing Process Parameters on the Microstructure and Mechanical Properties of Dual Phase Steel

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