Experimental determination of the temperature dependence of steel thermal conductivity

Il’ichev, M. V.; Mordynskii, V. B.; Терешонок, Д. В.; Tyuftyaev, A. S.; Chikunov, S. E.

doi:10.1134/s0018151x15010095

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…where, T is the temperature, r is the distance from cold surface, k is the thermal conductivity, Cp is the specific heat, ρ is the steel density and t is the time [25]. The steel thermal conductivity (k) and the specific heat (Cp) are added to the model as functions of temperature [26,27].…”

Section: Methodsmentioning

confidence: 99%

Microstructure and Mechanical Properties of V-Alloyed Rebars Subjected to Tempcore Process

Ahmed

Ibrahim

Galal³

et al. 2021

Metals

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Two B400B-R and B500B grade rebars were industrially produced through a Tempcore process. The standard chemical composition of B500B grade was additionally alloyed with 0.067 wt.% V to enhance its mechanical properties. A set of optimized processing parameters were applied to manufacture two different diameters D20 (Ø 20 mm) and D32 (Ø 32 mm). The microstructure -mechanical properties relationships were evaluated using optical and scanning electron microscopes, hardness, and tensile testing. In addition, a thermal model was developed to define the thermal cycle evolution during cooling in the quenching & tempering box (QTB) to simulate the kinetics of V(C,N) precipitation. The microstructure observations showed a typical graded microstructure consisting of ferrite-pearlite core and outer tempered martensite ring for both grades of both diameters. The optimized processing parameters for B400B-R of D32 (compared with D20) resulted in softening of the core (from 160 to 135 HV10) and tempered martensite surface (from 220 to 200 HV10) as well as in decreasing the yield strength (from 455 to 413 MPa) and tensile strength (from 580 to 559 MPa). On the contrary, an increase in hardness of the core (from 165 to 175 HV10) and the outer tempered martensite (from 240 to 270 HV10), in addition to an increase in yield strength (from 510 to 537 MPa) at almost the same level of tensile strength of 624–626 MPa are observed for B500B grade D32 compared with D20. The modeling and simulation calculations suggest that the manufacturing D32 rebars of B500B grade involves longer quenching time in the QTB which allow deeper tempered martensite surface along with a relatively higher core temperature that renders faster kinetics and larger volume fraction of V(C,N) precipitates. The current study demonstrates that the full potential of V-alloying can be exploited when a sufficient quenching time at the equalization temperature is achieved, which is valid for D32 rebars.

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Section: Methodsmentioning

confidence: 99%

Microstructure and Mechanical Properties of V-Alloyed Rebars Subjected to Tempcore Process

Ahmed

Ibrahim

Galal³

et al. 2021

Metals

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“…Another application of lanthanated tungsten is the microplasmous welding, because lanthanum oxide decreases the time of arc lighting. Furthermore lanthanated tungsten can be used for the increase of the wear resistance of steel products by plasma machining [1]. In spite of the great need for lanthanated tungsten, the investigation of its physical principles is still required.…”

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Investigation of the argon arc binding to the lanthanated tungsten cathode

Gadzhiev¹,

Sargsyan²,

Терешонок³

et al. 2015

EPL

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Pyrometric and spectroscopic investigations of lanthanated tungsten cathode in argon arc plasma discharge at atmospheric pressure are reported. The distribution of the surface cathode temperature was measured. Calculations and estimates of the emission current density are performed. Experimental data of the total current density are compared with the obtained results of estimation. The possible reasons for the discrepancy between the experimental and theoretical values of the total current were discussed.

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“…Experimental setup. -The experiment was conducted using a DC plasma torch with an expanding anode channel and vortex stabilization of the discharge arc [11]. A plasma torch consists of three sections.…”

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One more study of argon arc binding to pure tungsten cathode

Gadzhiev¹,

Sargsyan²,

Терешонок³

et al. 2016

EPL

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Pyrometric and spectroscopic investigations of pure tungsten cathode in argon arc plasma discharge at atmospheric pressure are reported. The distribution of surface cathode temperature and the radial distribution of plasma temperature at different distance from the cathode tip were measured. We conducted a comparison between our work and other studies on arc discharges where cathodes from lanthanated (W-2% La2O3) and thoriated (W-2% ThO2) tungsten were used.

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Experimental determination of the temperature dependence of steel thermal conductivity

Cited by 7 publications

References 6 publications

Microstructure and Mechanical Properties of V-Alloyed Rebars Subjected to Tempcore Process

Microstructure and Mechanical Properties of V-Alloyed Rebars Subjected to Tempcore Process

Investigation of the argon arc binding to the lanthanated tungsten cathode

One more study of argon arc binding to pure tungsten cathode

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