Influence of silicon on the microstructures, mechanical properties and stretch-flangeability of dual phase steels

Zhou, Lei; Zhang, Dan; Liu, Yazheng

doi:10.1007/s12613-014-0968-8

Cited by 26 publications

(13 citation statements)

References 41 publications

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“…Instantaneous work hardening exponent v/s true strain plots shows that steels with additions of SiC exhibits larger plastic strain and work hardening than the base alloy due to the presence of stabilized ferrite and dissolved Si originated from SiC dissociation being this effect previously reported by Cai et al for ferrite-bainite dual phase steels 35 and by Zhou et al for ferrite-martensite dual phase steels 40 . The as-sintered and austempered samples show larger strains and work hardening coefficients than the martempered samples, SiC additions increase these differences thanks to the effect of Si in the ductility of the alloys as previously discussed.…”

Section: (4)supporting

confidence: 59%

Effect of Heat Treatments and SiC Content in the Mechanical Properties and Microstructure of Self-Lubricating Steels

et al. 2017

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The objective of the present work was to study the effect of heat treatments in the microstructure, graphite nodules and mechanical properties of self-lubricating steels, to achieve this, self-lubricating steels (Fe + 0.45C + 4Ni + 1Mo % wt ) and additions of 2 and 3 % wt SiC were fabricated. They were consequently heat treated in 3 different conditions: martempering at 180 °C and tempering at 530 °C and 300 °C respectively and austempering at 300 °C. Hardness, yield strength, tensile strength and work hardening behavior were studied in as-sintered and heat-treated samples. The microstructure was analyzed by optical microscopy, scanning electron microscopy, Raman spectroscopy and microhardness. The transformation temperatures were determined using dilatometric tests. Results show that the presence of dissolved Si in the matrix due to SiC dissociation notably affects the morphology of the microstructure and transformation temperatures also affecting post heat treatment mechanical properties. The structure of graphite nodules produced by SiC dissociation is nott significantly affected by the heat treatments.

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Section: (4)supporting

confidence: 59%

Effect of Heat Treatments and SiC Content in the Mechanical Properties and Microstructure of Self-Lubricating Steels

et al. 2017

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“…The strain behavior at the hole edge during the hole expansion test occurs similarly to the strain in the tensile test . In general, steels with lower ultimate tensile strength, higher elastic ratio, higher total elongation, higher post‐uniform elongation, lower strain hardening exponent, and higher normal anisotropy (

\overset{false¯}{r}

) show higher hole expansion ratio (HER). In addition, the crystallographic texture causes plastic anisotropy and affects the formability of steels .…”

Section: Introductionmentioning

confidence: 97%

Microstructure, Crystallographic Texture, and Stretch‐Flangeability of Hot‐Rolled Multiphase Steel

Moura

Ferreira

Martins

et al. 2020

steel research int.

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The microstructure, crystallographic texture, strain hardening in the hole edge‐punched and stretch‐flangeability of hot‐rolled multiphase sheet steel is investigated by scanning electron microscopy, electron backscatter diffraction, and microhardness measurements. The results show that the strain hardening in the hole edge‐punched is not the main factor that influences the hole expansion ratio. The bainite fraction, average grain area, and kernel average misorientation distribution mean are microstructure factors that improve the hole expandability and reduce the effect of strain hardening in the hole edge‐punched on the hole expansion ratio. The crystallographic texture affects the hole expandability. The high intensity of {332}<113>α and {111}<112>α components that have higher normal anisotropy (rtrue¯) also reduces the effect of strain hardening at the hole edge‐punched. The cracks propagate through the interfaces following the banded microstructure direction at the hole edge‐punched during the punching process. The gamma distribution analysis of the kernel average misorientation distribution indicates that there are different energy transfer (β parameter) and dislocation densities due to different cooling rates.

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“…2) Since addition of Si and Mn is a valid way to achieve the required mechanical properties, a galvanizing method which is applicable to Si, Mn-added hot-rolled steel is highly demanded. [3][4][5] Although Si and Mn are also added to cold-rolled steel to secure mechanical properties, it is well known that these elements deteriorate galvanizability due to selective surface oxidation (element segregation) during the recrystallization annealing process. [6][7][8][9][10][11][12][13] In the case of hot-rolled steel, the factors that affect the galvanizability of high tensile strength hot-rolled steel sheets had not been investigated in detail,…”

Section: Introductionmentioning

confidence: 99%

Influence of Selective Surface Oxidation of Si and Mn on Fe–Zn Alloying Reaction on Hot-rolled Steel Sheets

Koba¹,

Fushiwaki²,

Nagataki³

2019

ISIJ Int.

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The Fe-Zn alloying reaction and selective oxidation behavior of 0.7 mass% Si-1.15 mass% Mn added hot-rolled steel annealed at 600-800°C were investigated by comparison with those of cold-rolled steel. The Fe-Zn reactivity of the hot-rolled steel improved from 600°C to 700°C but deteriorated from 700°C to 800°C. Above 700°C, the amount of Fe-Si-Mn oxide on the steel surface increased with increasing temperature, and this oxide deteriorated Fe-Zn reactivity. Below 700°C, a thin layer of Fe oxide on the steel surface deteriorated Fe-Zn reactivity. This oxide layer was reduced by Si and Mn that diffused from the steel substrate. Therefore, as the temperature increased from 600°C to 700°C, Fe-Zn reactivity improved due to the formation of reduced iron on the steel surface. In the case of the cold-rolled steel, the same selective oxidation behavior and reduction mechanism of the Fe oxide were also confirmed, and as a result, the Fe-Zn reactivity of the cold-rolled steel showed behavior similar to that of the hot-rolled steel. However, the Fe-Zn reactivity of the cold-rolled steel improved at a lower temperature than that of the hot-rolled steel. This can be explained by the faster diffusion rates of Si and Mn in the cold-rolled steel than in the hot-rolled steel. That is, reduction of the surface Fe oxide layer by diffused Si and Mn proceeded at a lower temperature, and as a result, the Fe-Zn reactivity of the cold-rolled steel also improved at a lower temperature.

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Influence of silicon on the microstructures, mechanical properties and stretch-flangeability of dual phase steels

Cited by 26 publications

References 41 publications

Effect of Heat Treatments and SiC Content in the Mechanical Properties and Microstructure of Self-Lubricating Steels

Effect of Heat Treatments and SiC Content in the Mechanical Properties and Microstructure of Self-Lubricating Steels

Microstructure, Crystallographic Texture, and Stretch‐Flangeability of Hot‐Rolled Multiphase Steel

Influence of Selective Surface Oxidation of Si and Mn on Fe–Zn Alloying Reaction on Hot-rolled Steel Sheets

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