The effect of silicon and vanadium alloying on the microstructure of air cooled forged HSLA steels

Holappa, Lauri; Ollilainen, V.; Kasprzak, W.

doi:10.1016/s0924-0136(00)00778-0

Cited by 13 publications

(8 citation statements)

References 2 publications

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“…The effect of Si addition on hardness of different compositions of ferrites has also been studied by other researchers [13][14][15] and observed that the micro-hardness was increased with Si addition.…”

Section: Micro-hardness Studymentioning

confidence: 90%

“…It has already been discussed [6] that bulk density increases by increasing the concentration of Ni ferrite systems. Increase in bulk density can be attributed to the difference in specific gravity of the ferrite components, as NiO (6.72 g/cm 3 ) is heavier than ZnO (5.60 g/cm 3 ), Some researcher [12][13][14] shows in their work that the hardness of ferrites exhibited a greater dependence on the grain size than on the density of the sample. Porosity decreases and hardness increases in this case, as the number of pores is reduced by increasing Ni concentration, consequently, grains come closer to each other, the grain to grain contact area is increased leading to greater densification or less porosity.…”

Section: Effect Of Density and Porosity On Hardnessmentioning

confidence: 99%

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Micro-structural and Microhardness Study of Ni-Zn Ferrite Using Si Additive

Ghazanfar

2013

J. Sci. Res.

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Mixed Ni-Zn ferrites (x = 0.66, 0.77, 0.88, 0.99) were prepared by the double sintering ceramic method. Locally available low cost Fe 2 O 3 with 0.5wt% of Si additive was used for this purpose to reduce the process price markedly and to improve the properties of the ferrite produced. Micro structural and micro hardness properties along with density and porosity have been investigated. Hardness increases with increase in metal contact, x of Ni x Zn 1-x Fe 2 O 4. SEM and optical micrograph shows very similar morphology of the particles with the amount of Si (0.5 wt %), must be low enough to prevent growth of large grains.

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Section: Micro-hardness Studymentioning

confidence: 90%

Section: Effect Of Density and Porosity On Hardnessmentioning

confidence: 99%

Micro-structural and Microhardness Study of Ni-Zn Ferrite Using Si Additive

Ghazanfar

2013

J. Sci. Res.

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“…Nozzle types [7] Thermal properties of fluid [8] Thermal properties of steel plate [9] Air properties [10] Nozzle height [11] Fluid viscosity [12] Surface roughness [13] Nozzle caliber [14] Surface tension [15] Undercooling [16] Jet volocity [17] Surfactant [18] Nozzle angle [19] Latent heat of vaporization [20] Jet flow rate [21] Fluid temperature [22] Droplet size [23] The laminar cooling device and the used method are important parts of the hot rolling lines in the iron and steel industry. Regarding temperature control, a header or a water curtain is used to control flow parameters of the cooling medium, while spray quenching and cooling are used for the medium-thick slab.…”

Section: Types Process Parameters Fluid Properties Steel Plate Properties Environmental Propertiesmentioning

confidence: 99%

A Study on the Heat Transfer Characteristics of Steel Plate in the Matrix Laminar Cooling Process

Chen

Bao

et al. 2021

Materials

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Accurate prediction and control of the steel plate temperature in the laminar cooling process are very challenging. In this research, an experimental platform was built to measure the heat transfer characteristics of the steel plate in the process of matrix laminar spray cooling when the steel plate is one millimeter away from the upper surface. The “buried couple method” was used, including the cooling temperature and cooling rate. Then, the temperature and the integrated heat transfer coefficient at the steel plate surface were calculated by the time-sequential function method (TSFM). The obtained results show that the fast cooling stage under the water cooling condition occurred in the first 1.5 s, and the measuring point temperature decreased by 8%. The “re-reddening” phenomenon of the steel plate appeared with time, and the measuring point temperature increased by 37%. Second, the maximum calculated difference between the surface temperature and the measuring point temperature was 0.75 °C, and the integrated heat transfer coefficient conformed to the periodic boundary features. The comprehensive convective heat transfer coefficient on the surface was in agreement with the periodic boundary characteristics, and its value exhibited oscillatory attenuation with the cooling process, and the oscillatory peak period was about 6 seconds. Two methods, sequential function method (SFM) and finite difference method (FDM), were used to verify the correctness of TSFM.

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“…The main features of these steels include high yield strength [10,11], high toughness [12], good weldability [13] and low ductile-to-brittle transition temperature [14]. In order to further improve the weldability properties of these high strength steels, carbon content is usually kept low (≤0.1 wt.%) and the effect of reduction in strength and hardenability due to carbon reduction is compensated by adding manganese (between 1.4 to 1.9 wt.%) in addition to some minor amounts of strong carbide forming microalloyed elements such as Nb [15], Ti [16], V [17] and Mo [18]. These microalloyed elements, which lead to fine-grained microstructures, are responsible for simultaneous increase of strength, toughness and welding properties [19].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution and Carbon Partitioning in Interstitial Free Weld Simulated API 5L X60 Steel

Zarchi

Khajesarvi

Banadkouki

et al. 2019

Reviews on Advanced Materials Science

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The microstructural characterizations and partitioning of carbon element in the weld heat affected zones of a commercial API 5L X60 line pipe steel were studied by applying a high speed heating and cooling dilatometry technique in the present research work. The hollow cylindrical specimens were quickly heated to 1000°C, soaked for only 5 s followed by continuous cooling to ambient temperature. Besides the construction of CCT diagram of this high strength low alloy steel using the dilatation data, the hardening response, microstructural features and carbon partitioning of weld simulated specimens were investigated. The obtained results showed that the hardening response of samples increased from 142 to 261HV10kg with increasing cooling rates. These hardening variations were attributed to the changes in microstructural features and carbon partitioning that occurred between the microconstituents present in the microstructures of weld simulated samples.

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The effect of silicon and vanadium alloying on the microstructure of air cooled forged HSLA steels

Cited by 13 publications

References 2 publications

Micro-structural and Microhardness Study of Ni-Zn Ferrite Using Si Additive

Micro-structural and Microhardness Study of Ni-Zn Ferrite Using Si Additive

A Study on the Heat Transfer Characteristics of Steel Plate in the Matrix Laminar Cooling Process

Microstructural Evolution and Carbon Partitioning in Interstitial Free Weld Simulated API 5L X60 Steel

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