Effect of martensite strength on the tensile strength of dual phase steels

Chen, Huang-Chuan; Cheng, Gwo-Hwa

doi:10.1007/bf02385411

Cited by 69 publications

(52 citation statements)

References 7 publications

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“…This seems consistent with the design basis for these steels, since the volume fraction of martensite mainly determines the strength and hardness of DP steels. 2,23) As well, this result agrees with previous findings showing that the volume fraction of martensite in the DP steels determined the reduction of ultimate tensile strength when the HAZ was simulated in DP steels using a Gleeble thermal simulator. 15) …”

Section: Effects Of Martensite Content On Maximum Haz Softeningsupporting

confidence: 91%

Effects of Heat Input and Martensite on HAZ Softening in Laser Welding of Dual Phase Steels

Xia¹,

Biro²,

Tian³

et al. 2008

ISIJ Int.

210

109

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Laser welds were made in three dual-phase (DP) alloys with ultimate tensile strengths ranging from 450-980 MPa and varying microstructures to investigate effects of heat input on heat affected zone (HAZ) softening. To compare the total heat transferred into the HAZ of all the welds, heat input was normalized using the Rosenthal Equation. It was found that HAZ softening experienced in a DP steel was a function of both martensite content and heat input. Maximum HAZ softening was proportional to the martensite content, and the heat input controlled the completion of softening. Material softening was normalized by martensite content, which showed that the contribution of martensite to material hardness from the three materials is the same; however the materials had different transformation kinetics.

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Section: Effects Of Martensite Content On Maximum Haz Softeningsupporting

confidence: 91%

Effects of Heat Input and Martensite on HAZ Softening in Laser Welding of Dual Phase Steels

Xia¹,

Biro²,

Tian³

et al. 2008

ISIJ Int.

210

109

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“…Reduction in strength due to higher V m % and less carbon in martensite observed in present study is in agreement with the findings of other researchers [1,8,12,17]. …”

Section: Fig 7 Microstructure Of B3 Soaked For 3hrs At 800oc Consissupporting

confidence: 94%

“…The 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.…”

Section: Effect Of Intercritical Heat Treatment On Mechanical Propertmentioning

confidence: 99%

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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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“…8 the constituent properties (strength, formability, etc.) [23][24][25][26][27][28][29][30] of the ferrite/martensite phases. In order to understand the deformation mechanisms of nano-precipitated DP steels, the effect of these factors on mechanical properties should systematically be investigated.…”

Section: Introductionmentioning

confidence: 99%

Tensile Behavior of Ferrite-martensite Dual Phase Steels with Nano-precipitation of Vanadium Carbides

et al. 2015

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This paper reports the effect of nano-precipitation strengthening of ferrite on the tensile behavior of ferrite-martensite dual phase (DP) steels. Samples of ferrite-martensite DP steel containing a dispersion of nano-sized vanadium carbides (VCs) in the ferrite phase were produced by interphase precipitation and quenching of a V-added low carbon steel, and the mechanical properties are compared with those of conventional ferrite-martensite DP samples without VC particles. Both the yield stress and the ultimate tensile strength are significantly increased by nano-VC precipitates. For ferrite volume fractions of 20-50% a dispersion of VCs results in only a small change in the elongation, whereas for ferrite volume fractions of above 50% both uniform and post-uniform elongations are decreased by a VC dispersion. It is suggested that dispersion of nano-precipitates in ferrite is an effective approach to simultaneously improve the strength and the strength-ductility balance of DP steels. Digital image correlation (DIC) analysis demonstrates that the ferrite phase is more deformed than the martensite phase in both VC-free and VC-dispersed DP samples, but that such strain partitioning is less pronounced in the VC dispersion-hardened samples. It is found that the stress-strain relationship of DP samples can reasonably be explained based on a law of mixtures using partitioned strain and stress values as estimated from the DIC analysis.KEY WORDS: dual phase (DP) steel; interphase precipitation; vanadium carbides (VC); mechanical property; digital image correlation (DIC); strain and stress partitioning.

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Effect of martensite strength on the tensile strength of dual phase steels

Cited by 69 publications

References 7 publications

Effects of Heat Input and Martensite on HAZ Softening in Laser Welding of Dual Phase Steels

Effects of Heat Input and Martensite on HAZ Softening in Laser Welding of Dual Phase Steels

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

Tensile Behavior of Ferrite-martensite Dual Phase Steels with Nano-precipitation of Vanadium Carbides

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