Influence of additional elements (Mo, Nb, Ta and B) on the mechanical properties of high-manganese dual-phase steels

Terao, Nobuzo; Cauwe, B.

doi:10.1007/bf01115721

Cited by 15 publications

(4 citation statements)

References 10 publications

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“…A few studies have been done on the fabrication of fine-grained DP steels with good mechanical properties using alloying additions. Terao and Cauwe 3) reported that addition of high Mn content (3 wt.%) to DP steels resulted in fine dispersion of martensite leading to higher tensile strength and good ductility. Adding alloying elements like Mo, Nb, Ta and B led to further improvement of mechanical properties of the high Mn DP steels.…”

Section: Introductionmentioning

confidence: 99%

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

2015

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Dual phase (DP) steels have been investigated using a new approach utilizing simple cold-rolling and subsequent intercritical annealing of a martensite-ferrite duplex starting structure. The ferrite grain size and volume fraction of martensite were varied by changing the rolling reduction and intercritical annealing time. Ultrafine grained DP (UFG-DP) steel with an average grain size of about 2 μm was achieved by short intercritical annealing of the 80% cold-rolled duplex microstructure. Tensile testing revealed superior mechanical properties (the ultimate tensile strength of 1 100 MPa and elongation of 13%) for the new DP steel in comparison with the commercially used high strength DP980 steel. The variations in hardness, strength and elongation of the specimens with rolling reduction and intercritical holding time were correlated to microstructural characterizations. The inherent mechanism for strengthening of the DP steel was discussed and the contribution of each strengthening factor was quantitatively calculated. The results showed that the calculated yield strength (430.6 MPa) is very close to the measured value (422 MPa).

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Section: Introductionmentioning

confidence: 99%

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

2015

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“…As DP steels show a good combination of strength, ductility, formability, weldability, and low price, they are extensively used in body structure of automobiles. [5,6] Several attempts to improve microstructure and mechanical properties of DP steels have been done in the recent years, and among them addition of alloying elements [7][8][9][10][11][12] was found to be an effective way. For instance, increasing the amounts of carbon, [9] manganese, [10] silicon, [11] and niobium [12] contents individually was reported to exhibit positive effects on the enhancement of mechanical properties of DP steels.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Dual‐Phase Steels by Combining Adjusted Initial Microstructures and Severe Plastic Deformation

Satjabut

Kalhor

Uthaisangsuk

et al. 2021

steel research int.

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Herein, the effects of initial microstructure in combination with the severe plastic deformation on the developed microstructures and mechanical properties of dual‐phase (DP) steels are investigated. DP steels are produced by an intercritical annealing from the preliminarily heat‐treated samples with different initial microstructures. The constrained groove pressing (CGP) process is additionally applied before the final intercritical annealing step. It is found that the martensitic and tempered martensitic microstructures lead to DP steels with a good balance of strength and elongation because of finer and more uniformly dispersed martensitic islands. The ferrite/pearlite banded initial microstructure is not a proper choice for intercritical annealing as all mechanical properties become worse. The CGP can be employed before intercritical annealing for refining microstructure and enhancing damage tolerance of DP steels. Nevertheless, the impacts of the CGP process on the resulted strength of DP steels are obviously different depending on the initial microstructures. The amounts, sizes, and distributions of dimples and cleavage facets on the fracture surfaces of DP steels correlate well with the corresponding microstructures and tensile characteristics.

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“…Simultaneously, the safety features at the time of car accidents would enhance. To build up the strength of the DP steels, either alloying elements are added or carbon content is increased [3][4][5]. However, the former is costly and the latter limits the ability of the steels to be welded.…”

Section: Introductionmentioning

confidence: 99%

On the Simultaneous Improving of Strength and Elongation in Dual Phase Steels via Cold Rolling

Mazaheri

Jahanara

Sheikhi

et al. 2020

Metals

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The ferrite-pearlite microstructure was cold-rolled to form dual phase (DP) steels, the percentage reduction of which varied. To do so, the steels were annealed in two steps and then the workpiece underwent water quenching. Accordingly, a decrease was observed in the average size of the ferrite grains, from above 15 µm to below 2 µm, subsequent to the thermomechanical processing. By an increase in the reduction percentage, the volume fraction of martensite grew. The balance between strength and elongation also improved nearly 3 times, equivalent to approximately 37,297 MPa% in DP in comparison to 11,501 MPa% in the ferrite-pearlite microstructure, even after 50% cold-rolling. Based on Hollomon and differential Crussard-Jaoul (DC–J) analyses, the DP steels under investigation deformed in two and three stages, respectively. The modified C–J (MC–J) analysis, however, revealed that the deformation process took place in four stages. The rate of strain hardening at the onset of the deformation process was rather high in all DP steels. The given rate increased once the size of the ferrite grains reduced; an increase in the volume fraction of martensite due to larger percentage of reduction also contributed to the higher rate of strain hardening. The observation of the fractured surfaces of the tensile specimens indicated ductile fracture of the studied DP steels.

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Influence of additional elements (Mo, Nb, Ta and B) on the mechanical properties of high-manganese dual-phase steels

Cited by 15 publications

References 10 publications

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

Microstructure and Mechanical Properties of Dual‐Phase Steels by Combining Adjusted Initial Microstructures and Severe Plastic Deformation

On the Simultaneous Improving of Strength and Elongation in Dual Phase Steels via Cold Rolling

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