Fine-grained dual phase steel via intercritical annealing of cold-rolled martensite

Alibeyki, Mohammad; Mirzadeh, Hamed; Najafi, Mahnaz

doi:10.1016/j.vacuum.2018.06.003

Cited by 61 publications

(21 citation statements)

References 46 publications

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“…4b. It has been shown in several recent works that fine-grained DP steels have an exceptional combination of strength and ductility [12,[26][27][28][29][30][31][32][33][34][35]51]. The ferrite grain size of DP1 and DP2 can be estimated as ∼ 8.28 and ∼ 4.85 µ m. The formation of fine-grained DP2 steel is directly related to the initial microstructure before intercritical annealing, i.e., cold-rolled martensitic microstructure.…”

Section: Intercritical Annealing Of the Cold Rolled Sheet (Dp2)mentioning

confidence: 96%

“…For the DP steels, the initial work-hardening rate is much higher as discussed above. Moreover, three stages of work-hardening can be detected: The transient Stage I represents the glide of mobile dislocations in ferrite present near the martensite regions, Stage II belongs to the deformation of constrained ferrite, and Stage III is related to the concurrent deformation of martensite and hardened ferrite [13,41,51,52]. For a major part of the curves, it can be seen that the workhardening curve corresponding to DP2 locates above DP1 at each given flow stress, which reveals that the work-hardening response of DP2 is better.…”

Section: Intercritical Annealing Of the Cold Rolled Sheet (Dp2)mentioning

confidence: 99%

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The effects of primary thermo-mechanical processing routes and intercritical annealing on the mechanical properties of st37 low carbon steel

Alibeyki¹,

Mirzadeh²,

Najafi³

2018

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The effect of thermo-mechanical processing routes on the microstructure and mechanical properties of st37 low carbon steel was studied. Several dual phase (DP) ferritic-martensitic steels were produced by intercritical annealing of the martensitic, cold-rolled martensitic, and bimodal-sized ferritic microstructures. The latter microstructure was produced by subcritical tempering of cold-rolled DP steel to develop an aggregate of ultrafine and large ferrite grains. The DP steel obtained by intercritical annealing of cold-rolled martensite was shown to exhibit better strength-ductility balance compared with that obtained by intercritical annealing of the as-quenched martensite due to much finer microstructure and enhancement of work-hardening behavior in the former. The bimodal-sized ferritic structure showed high yield stress, yieldpoint elongation, and less pronounced work-hardening regime. The DP steel obtained by intercritical annealing of bimodal-sized ferritic structure exhibited inferior strength-ductility tradeoff compared with that obtained by intercritical annealing of cold-rolled martensite due to the coarser microstructure in the former. Conclusively, it is possible to enhance the mechanical properties of st37 low carbon steel by simple processing routes. K e y w o r d s : dual phase steels, microstructure, mechanical properties, strain hardening rate

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Section: Intercritical Annealing Of the Cold Rolled Sheet (Dp2)mentioning

confidence: 96%

Section: Intercritical Annealing Of the Cold Rolled Sheet (Dp2)mentioning

confidence: 99%

The effects of primary thermo-mechanical processing routes and intercritical annealing on the mechanical properties of st37 low carbon steel

Alibeyki¹,

Mirzadeh²,

Najafi³

2018

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“…Burford et al [6] investigated the influence of grain size of ferrite on mechanical properties of the dual-phase 0.08C-1.45Mn-0.2Si steel, showing that the microstructure with the finer ferrite grains had the higher tensile strength, but the yield strength was mostly constant. Recently, Alibeyki et al [7] studied the production of the fine-grain dual-phase steel with the chemical composition of 0.12C-1.1Mn-0.16Si by using a combination of heat treatment cycles and coldrolling; as a result, the finer the dual-phase microstructure, the better the tensile strength, and the better the balance of strength and ductility.…”

Section: Introductionmentioning

confidence: 99%

Impact of Cold‐Rolling and Heat Treatment on Mechanical Properties of Dual‐Phase Treated Low Carbon Steel

Long

Hien

Thành

et al. 2020

Advances in Materials Science and Engineering

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The low carbon steel has good ductility that is favorable for forming process, but its low strength leads to limiting their application for forced structures. This paper studied improving strength of low-carbon steel via rolling deformation and dual-phase treatment. The results showed that the dual-phase treated steel had a combination of high strength and good ductility; its tensile ultimate strength reached 740 MPa with elongation at fracture of over 15%, while that of the cold-rolled steel only reached 700 MPa with elongation at fracture of under 3%. Based on the obtained results, relationships between mechanical properties and dual-phase processing parameters were established to help users choose suitable-processing parameters according to requirements of products.

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“…Interestingly, the martensitic low-carbon steels show high workhardening rate and can be directly used without tempering heat treatment. The low-carbon martensitic steels might be also subjected to plastic deformation as shown by Morito et al [17], Nouroozi et al [24], and Alibeyki et al [25]. Based on this fact, an advanced thermomechanical processing has been developed by Tsuji et al [26], which is based on the rolling of a martensite starting microstructure followed by short tempering to produce an ultrafine ferrite/carbide aggregate.…”

Section: Introductionmentioning

confidence: 99%

Tempering of deformed and as-quenched martensite in structural steel

Najafi

Mirzadeh

Alibeyki

2019

J min metall B Metall

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Annealing of deformed martensite (high-temperature tempering) in St37 steel was studied. Different reductions in thickness were considered and compared with the behavior of as-quenched martensite during tempering. tempering of the asquenched martensite was accompanied by the formation of carbide particles, incomplete disappearance of the lath martensite morphology, and continuous decrease in hardness until reaching low values. However, during tempering of the cold rolled martensite, the precipitation of carbides in the lamellar structure, development of distinct equiaxed ultrafine grains through a continuous recrystallization mechanism, and a sudden hardness drop were characterized. the importance of cold rolling reduction and its amount were also discussed.

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Fine-grained dual phase steel via intercritical annealing of cold-rolled martensite

Cited by 61 publications

References 46 publications

The effects of primary thermo-mechanical processing routes and intercritical annealing on the mechanical properties of st37 low carbon steel

The effects of primary thermo-mechanical processing routes and intercritical annealing on the mechanical properties of st37 low carbon steel

Impact of Cold‐Rolling and Heat Treatment on Mechanical Properties of Dual‐Phase Treated Low Carbon Steel

Tempering of deformed and as-quenched martensite in structural steel

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