The influence of microstructure and composition on the plastic behaviour of dual-phase steels

Pierman, Anne-Pascale; Bouaziz, Olivier; Pardoen, Thomas; Jacques, Pascal; Brassart, Laurence

doi:10.1016/j.actamat.2014.04.015

Cited by 180 publications

(79 citation statements)

References 46 publications

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“…They considered an elasto-plastic matrix material reinforced with elastic particles with reference to cast aluminium alloys. A systematic study of the influence on flow behaviour of the microstructural parameters of dual phase steels consisting of ferrite and martensite with preliminary results on fracture were presented by [14].…”

Section: Introductionmentioning

confidence: 99%

Characterization of ductile fracture properties of quench-hardenable boron steel: Influence of microstructure and processing conditions

Golling

Östlund

Oldenburg

2016

Materials Science and Engineering: A

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Developments of the hot stamping technology have enabled the production of components with differential microstructure composition and mechanical properties. These can increase the performance of certain crash-relevant automotive structures by combining high intrusion protection and energy absorption. This paper presents a comprehensive experimental investigation on the flow and ductile fracture properties of boron-alloyed steel with a wide range of different microstructure compositions. Three types of dual phase microstructures at three different volume fractions, and one triple phase grade, were generated by thermal treatment. Flow curves extending beyond necking and the equivalent plastic strain to fracture for each grade was determined by tensile testing using fullfield measurements. The influence of phase composition and microstructural parameters were further investigated by means of a multi-scale modeling approach based on mean-field homogenization in combination with local fracture criteria. Inter-phase and intra-phase fracture mechanisms were considered by adopting two separate fracture criteria formulated in terms of the local average stress field. The micromechanical model captures with useful accuracy the strong influence of microstructure and processing conditions on the flow and fracture properties, implying promising prospects of mean-field homogenization for the constitutive modeling of hot stamped components.

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Section: Introductionmentioning

confidence: 99%

Characterization of ductile fracture properties of quench-hardenable boron steel: Influence of microstructure and processing conditions

Golling

Östlund

Oldenburg

2016

Materials Science and Engineering: A

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“…al. [13] demonstrated that TS results are not in line with expectations based on the mixture law in DP steels containing10-70 vol.% martensite. The observations of various researchers [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.…”

Section: Introductionmentioning

confidence: 65%

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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“…It was reported that increasing carbon content of martensite would lead to the increase in the tensile strength of DP steel [27]. For process B, most of the martensite is formed at the temperature of 250 1C, at which the carbon diffusivity is lower.…”

Section: Yield and Tensile Strengthmentioning

confidence: 99%

Microstructure and mechanical properties of dual phase strip steel in the overaging process of continuous annealing

Liu

Cen

et al. 2015

Materials Science and Engineering: A

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The influence of microstructure and composition on the plastic behaviour of dual-phase steels

Cited by 180 publications

References 46 publications

Characterization of ductile fracture properties of quench-hardenable boron steel: Influence of microstructure and processing conditions

Characterization of ductile fracture properties of quench-hardenable boron steel: Influence of microstructure and processing conditions

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

Microstructure and mechanical properties of dual phase strip steel in the overaging process of continuous annealing

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