Effect of boron on the continuous cooling transformation kinetics in a low carbon advanced ultra-high strength steel (A-UHSS)

Altamirano, Gerardo; Mejı́a, I.; Hernández-Expósito, A.; Cabrera, J.M.

doi:10.1557/opl.2013.253

Cited by 6 publications

(2 citation statements)

References 8 publications

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“…Figures 1(a) to (d) depict the representative normalized microstructures. It can be seen that the samples have ferritic-pearlitic microstructures, which is consistent with the microstructure of similar steels [11][12][13][14][15][16]. By increasing the holding time at the austenitization temperature, the microstructures became coarser.…”

Section: Resultssupporting

confidence: 80%

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: 80%

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

Soleimani

Mirzadeh

Dehghanian

2020

Mater. Res. Express

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“…In fact, boron has been added to modern low carbon microalloyed steels, i.e., advanced high-strength steels (AHSS), to reduce the use of more expensive alloying elements, which improves the hot flow behavior of steel in a similar or higher level than carbon does [32][33][34][35][36]. Such studies indicate that the improved hot ductility obtained after boron additions can be associated with boron segregation to austenite grain boundaries, phenomenon that increases grain boundary cohesion.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ti and B microadditions on the hot ductility behavior of a High-Mn austenitic Fe–23Mn–1.5Al–1.3Si–0.5C TWIP steel

Mejı́a

Salas-Reyes

Calvo

et al. 2015

Materials Science and Engineering: A

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a b s t r a c tThis research work studies the effect of combined Ti and B microadditions and the solidification route on the hot ductility behavior of a high-Mn austenitic Twinning Induced Plasticity (TWIP) steel. For this purpose, uniaxial hot tensile tests were carried out at different temperatures between 700 and 1100°C under a constant strain rate of 10. The hot ductility was determined by measuring the reduction of transverse area (%RA) after specimen rupture. Characterization was performed by SEM-EBSD and TEM techniques in order to identify the relationship between microstructural features and cracking phenomena. Results indicate that the early occurrence of dynamic recrystallization (DRX) at the intermediate temperature range (800-900°C) is the favorable mechanism that enhances the ductility, achieving RA values up to 82%. These high RA values are discussed in terms of the boron effect on the improvement of the grain-boundaries cohesion through non-equilibrium segregation, and Ti(C,N) precipitation, which reduces the formation of harmful precipitates such as BN and AlN. Additionally, the Fe 23 (B,C) 6 and B 4 C compounds were identified, which are less detrimental to hot ductility than boron-nitride compounds. Finally, the fracture surfaces of the present TWIP steels in the temperature range of the highest ductility indicate that the failure mode is of the ductile type as evidenced by the presence of many dimples.

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