Effect of holding time at an intercritical temperature on the microstructure and tensile properties of a ferrite-martensite dual phase steel

Balbi, M.; Alvarez‐Armas, I.; Armas, A.F.

doi:10.1016/j.msea.2018.07.029

Cited by 49 publications

(24 citation statements)

References 21 publications

(22 reference statements)

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“…Conversely, as only ferrite and austenite (martensite after quenching) are present during processing, SQ from the austenitic region to the IA range is an optimum approach to study the effect of martensite volume fraction on the properties of DP steel. Moreover, the problem of Mn partitioning is much less pronounced in DP steel processed via the SQ route …”

Section: Introductionmentioning

confidence: 99%

Unraveling the Effect of Martensite Volume Fraction on the Mechanical and Corrosion Properties of Low‐Carbon Dual‐Phase Steel

Soleimani

Mirzadeh

Dehghanian

2019

steel research int.

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The effect of martensite volume fraction on the mechanical and corrosion properties of low-carbon dual-phase steel is studied based on both step quenching (SQ) and intercritical annealing (IA) routes. For SQ samples, hardness and ultimate tensile strength decrease with increasing holding time at the intercritical temperature and reach a plateau, which is related to the decrease in the amount of martensite during annealing. Conversely, for the IA samples, hardness increases during holding at the intercritical temperature due to austenitization and reaches the same plateau. At a same martensite volume fraction, the work-hardening behavior of SQ samples is better than IA samples, which is related to both the finer grain size and smaller martensite islands in the former. At low martensite fractions, the corrosion properties are comparable with the asreceived ferritic-pearlitic sample. It is revealed that by decreasing the volume fraction of martensite in SQ samples, the corrosion current density (i corr ) decreases almost linearly, and at martensite content of zero, it reaches the i corr of the fully ferritic microstructure. The latter is found to be lower than the i corr of the as-received sample. Therefore, the real effect of martensite on corrosion properties is unraveled for the first time.

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Section: Introductionmentioning

confidence: 99%

Unraveling the Effect of Martensite Volume Fraction on the Mechanical and Corrosion Properties of Low‐Carbon Dual‐Phase Steel

Soleimani

Mirzadeh

Dehghanian

2019

steel research int.

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“…An increasing martensite fraction decreases the ductility but increases strength [14]. For example, when the martensite fraction is 40%, the ultimate tensile strength (UTS) is 660 MPa with a total elongation (TE) of 46.7%; when the martensite fraction is 50%, the UTS is 670 MPa while the TE is 45.0% [14]. After cold rolling, the inter critical annealing in the ferrite-austenite two-phase region can control the ferrite fraction and the austenite fraction.…”

Section: Introductionmentioning

confidence: 99%

“…Strength and ductility can be adjusted via controlling the volume fraction of martensite. An increasing martensite fraction decreases the ductility but increases strength [14]. For example, when the martensite fraction is 40%, the ultimate tensile strength (UTS) is 660 MPa with a total elongation (TE) of 46.7%; when the martensite fraction is 50%, the UTS is 670 MPa while the TE is 45.0% [14].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure Evolution during the Production of Dual Phase and Transformation Induced Plasticity Steels Using Modified Strip Casting Simulated in the Laboratory

Xiong

Kostryzhev

Zhao

et al. 2019

Metals

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Instead of conventional steel making and continuous casting followed by hot and cold rolling, strip casting technology modified with the addition of a continuous annealing stage (namely, modified strip casting) is a promising short-route for producing ferrite-martensite dual-phase (DP) and multi-phase transformation-induced plasticity (TRIP) steels. However, at present, the multi-phase steels are not manufactured by the modified strip casting, due to insufficient knowledge about phase transformations occurring during in-line heat treatment. This study analysed the phase transformations, particularly the formation of ferrite, bainite and martensite and the retention of austenite, in one 0.17C-1.52Si-1.61Mn-0.195Cr (wt. %) steel subjected to the modified strip casting simulated in the laboratory. Through the adjustment of temperature and holding time, the characteristic microstructures for DP and TRIP steels have been obtained. The DP steel showed comparable tensile properties with industrial DP 590 and the TRIP steel had a lower strength but a higher ductility than those industrially produced TRIP steels. The strength could be further enhanced by the application of deformation and/or the addition of alloying elements. This study indicates that the modified strip casting technology is a promising new route to produce steels with multi-phase microstructures in the future.

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“…Conventional DP steels are usually produced via a process consisting of an intercritical annealing followed by quenching to transform austenite to martensite (and, sometimes small amount retained austenite may also be present) [6][7][8]. The steel exhibits high strength but low ductility which limits its application at some extent, so further improvement in properties remains essential in the competitive automotive industry.…”

Section: Introductionmentioning

confidence: 99%

Effect of manganese pre-partitioning process on the microstructure and mechanical properties of low carbon dual phase steel

Deng

Misra

2019

Metall. Res. Technol.

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A low carbon (0.11 wt.%) steel with 1.78% Mn was subjected to pre-partitioning quenching and partitioning (PQ&P), quenching and tempering (Q&T), quenching and partitioning (Q&P) to develop ferritemartensite dual phase (DP) steel. The study suggested that all the treatments resulted into ferrite, martensite (or tempered martensite) and retained austenite microstructure. The amount of retained austenite was ∼ 5%, when the steel was treated by PQ&P process with partitioning time of 100 s, because of Mn pre-partitioning stage increased in the stability of retained austenite. But only ∼ 1% for Q&T and Q&P processes. With the increase of partitioning time from 10 to 100 s in the PQ&P process, the amount of retained austenite was increased, the tensile strength decreased, and yield strength and elongation were both increased. Among the different heat treatment processes, PQ&P sample clearly yields most attractive combination of strength and ductility compared to Q&T and Q&P samples. The experimental steel after pre-partitioning quenching and partitioning (PQ&P) process had higher uniform elongation of 16.3% and strength-ductility balance (UTS Â TEL) of 17013 MPa.%. In contrast to conventional Q&T process, 27.3% higher uniform elongation and 7.4% greater strength-ductility balance were obtained.Keywords: dual-phase steel / quenching and partitioning / microstructure / mechanical properties / retained austenite *

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Effect of holding time at an intercritical temperature on the microstructure and tensile properties of a ferrite-martensite dual phase steel

Cited by 49 publications

References 21 publications

Unraveling the Effect of Martensite Volume Fraction on the Mechanical and Corrosion Properties of Low‐Carbon Dual‐Phase Steel

Unraveling the Effect of Martensite Volume Fraction on the Mechanical and Corrosion Properties of Low‐Carbon Dual‐Phase Steel

Microstructure Evolution during the Production of Dual Phase and Transformation Induced Plasticity Steels Using Modified Strip Casting Simulated in the Laboratory

Effect of manganese pre-partitioning process on the microstructure and mechanical properties of low carbon dual phase steel

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