Effect of Intercritical Annealing Conditions on Grain Growth Kinetics of Dual Phase Steel

Najafkhani, Fateme; Mirzadeh, Hamed; Zamani, Mehran

doi:10.1007/s12540-019-00241-2

Cited by 36 publications

(11 citation statements)

References 40 publications

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“…By increasing the holding time at the austenitization temperature, the microstructures became coarser. This is related to the effect of austenitization time on the grain growth of austenite, and hence, coarser grain sizes were obtained during decomposition of austenite as also shown in previous works [17][18][19][20]. For each micrograph, the volume fraction of pearlite was determined by image analysis from the surface fraction of this phase in the 2D micrographs.…”

Section: Resultssupporting

confidence: 66%

Effect of grain size on the corrosion resistance of low carbon steel

Soleimani

Mirzadeh

Dehghanian

2020

Mater. Res. Express

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Systematic works on the effect of grain size on the corrosion resistance of low carbon steel are scant. In the present work, a spectrum of grain sizes was obtained by simple heat treatment routes in a typical low-carbon steel. It was revealed that two distinct stages for the dependency of corrosion current density (i corr ) on the grain size exist. Above a limiting average grain size of ∼22 μm, i corr decreased slowly with increasing grain size. However, below this limiting value, i corr increased rapidly, which was related to the increased density of grain boundaries as interpreted by theoretical calculation of number of grains per unit area. Conclusively, a grain size of ∼22 μm (ASTM grain-size number of 8) was considered to be an optimum value according to the mechanical and corrosion standpoints.

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Section: Resultssupporting

confidence: 66%

Effect of grain size on the corrosion resistance of low carbon steel

Soleimani

Mirzadeh

Dehghanian

2020

Mater. Res. Express

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“…Low-carbon steels with a duplex ferrite-martensite microstructure constitute a major group of highperformance materials known as dual-phase (DP) steels [1][2][3][4][5]. The volume fraction of martensite [6][7][8], its morphology and distribution [9][10][11][12], and grain size of the ferritic matrix [13][14][15][16] are of major parameters governing mechanical properties and microstructure of these steels. Grain refinement is one of the best methods for improving their strength-ductility balance [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Improved properties of dual-phase steel via pre-intercritical annealing treatment and thermal cycling

Ghaemifar

Mirzadeh

Khorrami

et al. 2020

Materials Science and Technology

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The synergistic effects of pre-intercritical annealing treatments and multiple heating to the two-phase region (followed by quenching) on the microstructure and mechanical properties of dual-phase (DP) steel were studied. Intercritical annealing of ferritic-pearlitic, martensitic, and cold-rolled martensitic microstructures was investigated. The effects of tempering, austenitisation, grain growth, and recrystallisation were unravelled and an optimum holding time was characterised for each initial microstructure. Grain refinement by recrystallisation of cold-rolled martensitic microstructure resulted in the enhancement of tensile properties. Thermal cycling through multi-step intercritical annealing resulted in grain refinement and enhanced mechanical response. It was revealed that thermal cycling combined with the carefully controlled pre-intercritical microstructure could be simply used for the improvement of mechanical properties of DP steel.

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“…It is also found that the grain growth of ferrite in low-carbon steel is controlled by temperature and austenite island, and there is a competitive mechanism between the two factors [22,23]. When the annealing temperature increases, the initial grain growth rate also increases, which indicates that the grain growth is temperature-dependent.…”

Section: Influence Factors Of Transverse Microstructure Distributionmentioning

confidence: 93%

“…In the low-temperature region [22] (temperature ≤ 825 • C), the effect of temperature increase on grain growth is more evident than that of the austenite island pinning effect. Therefore, the grain growth process is highly temperature-dependent in this state.…”

Section: Influence Factors Of Transverse Microstructure Distributionmentioning

confidence: 96%

"Initiation mechanism on transverse microstructure and properties inhomogeneity of hot-rolled low-carbon steel plate "

He¹,

Zhang²,

Su³

et al. 2022

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The center and edge of the hot-rolled low-carbon steel plate reflect the inhomogeneity. Five positions along the transverse direction of the steel plate are taken as the research object. This study reveals the root cause of the inhomogeneity of transverse microstructure and properties of hot-rolled low-carbon steel plates. The grain size in the center of the hot-rolled low-carbon steel plate is relatively large, and the grain size at the edge is relatively small. The mechanical properties test shows that the closer the edge, the higher the hardness. The strength along the transverse direction is similar to the shape of W. The finite element simulation results show that the central cooling is slow, and the deformation degree is different in different transverse positions. In conclusion, the main reason for the inhomogeneous microstructure are the various cooling rates of different parts in the transverse direction. The synergistic effect of grain size and alloying elements is the main reason that causes the transverse strength distribution to show a "W" shape. K e y w o r d s : low-carbon steel, transverse structure and properties, cooling rate, finite element simulation

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Effect of Intercritical Annealing Conditions on Grain Growth Kinetics of Dual Phase Steel

Cited by 36 publications

References 40 publications

Effect of grain size on the corrosion resistance of low carbon steel

Effect of grain size on the corrosion resistance of low carbon steel

Improved properties of dual-phase steel via pre-intercritical annealing treatment and thermal cycling

"Initiation mechanism on transverse microstructure and properties inhomogeneity of hot-rolled low-carbon steel plate "

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