Mutual mechanical effects of ferrite and martensite in a low alloy ferrite-martensite dual phase steel

Ebrahimian, A.; Banadkouki, S.S. Ghasemi

doi:10.1016/j.jallcom.2017.02.287

Cited by 50 publications

(22 citation statements)

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“…The heterogeneity relevant to the plastic strain accommodation varies with the distribution and volume fraction of the martensite. [ 48–50 ] Fine and homogeneous distribution of martensite in ferrite matrix would develop many fine strain bands which allow more contribution of ferritic zones in accommodating the plastic deformation. Low volume fraction and coarse‐blocky morphology of martensite would enable it to accommodate higher stress.…”

Section: Developments On the Design Of The Microstructurementioning

confidence: 99%

Microstructural Modifications of Dual‐Phase Steels: An Overview of Recent Progress and Challenges

Ebrahimi

Saeidi

Raeissi

2020

steel research int.

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Optimization of the microstructure and its effect on the strength and ductility of the steel is one of the main aspects of the researcher's effort toward production of advanced structural materials. There have been various investigations focusing on the thermomechanical treatment and grain refinement of steel while some researches are dealing with the modification of chemical composition. This article considering major parameters influencing the mechanical properties of steels aims to present an overview of the outstanding achievements in improvement of the dual-phase steels. Following the obtained consensus, some advanced promising microstructural modification strategies are also suggested, which can bring new insights to shed light upon the further enhancement of the mechanical behavior of the dual-phase steels.

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Section: Developments On the Design Of The Microstructurementioning

confidence: 99%

Microstructural Modifications of Dual‐Phase Steels: An Overview of Recent Progress and Challenges

Ebrahimi

Saeidi

Raeissi

2020

steel research int.

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“…The low rate of carbon diffusion from central region toward the interfaces is because of the presence of considerable amounts of alloying elements including Si, Mn, and Mo in the steel composition. On the other hand, the carbon diffusion from the vicinity of polygonal ferrite grain into its ferrite/prior austenite interface is much faster because the polygonal ferrite crystals are less compact and have more lattice defects near the ferrite/prior austenite inter-faces, causing the higher level of carbon redistribution and so more saturation in the regions nearby the prior austenite [36,37]. Therefore, the degenerate pearlite is nucleated and grown from carbon-saturated ferrite/prior austenite in the faces.…”

Section: Further Investigation Of Both Figures 5a ′mentioning

confidence: 99%

Microstructural Evolution and Carbon Partitioning in Interstitial Free Weld Simulated API 5L X60 Steel

Zarchi

Khajesarvi

Banadkouki

et al. 2019

Reviews on Advanced Materials Science

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The microstructural characterizations and partitioning of carbon element in the weld heat affected zones of a commercial API 5L X60 line pipe steel were studied by applying a high speed heating and cooling dilatometry technique in the present research work. The hollow cylindrical specimens were quickly heated to 1000°C, soaked for only 5 s followed by continuous cooling to ambient temperature. Besides the construction of CCT diagram of this high strength low alloy steel using the dilatation data, the hardening response, microstructural features and carbon partitioning of weld simulated specimens were investigated. The obtained results showed that the hardening response of samples increased from 142 to 261HV10kg with increasing cooling rates. These hardening variations were attributed to the changes in microstructural features and carbon partitioning that occurred between the microconstituents present in the microstructures of weld simulated samples.

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“…al. [1] and Ebrahimian and Ghasemi, [10] have reported a linear variation of yield strength with martensite volume fraction and a non-linear one for TS consisting a peak hardening value around 50% martensite in a low carbon ferritemartensite DP steel. Speich and Miller [11] have suggested a completely linear dependence between hardness and martensite volume fraction in a low carbon low alloy ferritemartensite DP steel.…”

Section: Introductionmentioning

confidence: 97%

Effect of Intercritical Heat Treatment on Mechanical Properties of Plain Carbon Dual Phase Steel

Soomro

Abro

Baloch

2018

Mehran Univ. res. j. eng. technol.

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INTRODUCTIONactual distribution between these two phases allows them low yield stress, a smooth flow stress curve, better plasticity and formability with a high strain hardening coefficient [5]. Processing to produce the DP steels is usually done by intercritical annealing from room temperature to two-phase (α + χ) Effect of Intercritical Heat Treatment on Mechanical Properties of Plain Carbon Dual Phase SteelThe mechanical properties of DP steels are directly related to the synergistic effect of two phases present in these steels in which martensite controls the strength of the steel while ferrite is responsible for formability properties [7][8][9]. Numerous studies have reported that the mechanical properties of ferrite-martensite DP steels have been quite [1,3,5-6,8-10,12-13,] suggest that the mechanical behavior of ferrite-martensite DP microstructure cannot be predicted by the general rule of mixture law. These findings are still controversial and no agreement has yet been developed Although many investigations have been made to characterize the microstructure-property relationship of micro alloyed low carbon DP steels, literature pertaining to formation of ferrite-martensite DP microstructure and its effect on mechanical properties of plain low carbon steels has not been well studied.Present study therefore, aims to investigate the effect of intercritical annealing temperature and soaking time on martensite volume fraction and mechanical properties of AISI 1020 plain carbon steel. MATERIALS AND MEHTODChemical composition of a plain carbon steel grade (AISI 1020) used in present study is given in RESULTS AND DISCUSSION MicrostructureThe optical and SEM micrographs of as-received steel specimen are shown in Fig. 1 to which increasing the temperature within ferriteaustenite region increases the amount of austenite which will then transforms into martensite. Increase in grain size was also observed for the specimens soaked for 3hrs due to sufficient time available for grain growth.Also at high magnification, plate type martensite was found in the specimens intercritically heat treated at relatively lower temperatures i.e. 775and 800 o C as shown in Fig. 11(a-b) whereas, lath type martensite was found in the specimens intercritically heat treated at 825 o C as shown in Fig. 11(b). Mechanical PropertiesThe changes encountered in the mechanical properties due to variation of microstructure are summarized in Table 3. Tensile StrengthTS values are listed in Table 3. The higher TS of DP steel specimens is the result of presence martensite phase in the microstructure. Martensite has highly distorted lattice due to entrapment of carbon atoms, making it stronger phase and enabling it to sustain higher load compared to pearlite present in as-received steel. (1) The TS generally increased due to higher volume fraction of martensite formed in DP steel specimens. FIG. 1. MICROSTRUCTURE OF AS-RECEIVED SPECIMEN SHOWS FERRITE (LIGHT) AND PEARLIATE (DARK) (a) OPTICAL (500X) (b) SEM(1000X) FIG. 2. MICROSTRUCT...

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Mutual mechanical effects of ferrite and martensite in a low alloy ferrite-martensite dual phase steel

Cited by 50 publications

References 68 publications

Microstructural Modifications of Dual‐Phase Steels: An Overview of Recent Progress and Challenges

Microstructural Modifications of Dual‐Phase Steels: An Overview of Recent Progress and Challenges

Microstructural Evolution and Carbon Partitioning in Interstitial Free Weld Simulated API 5L X60 Steel

Effect of Intercritical Heat Treatment on Mechanical Properties of Plain Carbon Dual Phase Steel

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