Effects of electric current pulses on mechanical properties and microstructures of as-quenched medium carbon steel

Pan, Long; He, Wei; Gu, Bobo

doi:10.1016/j.msea.2016.03.031

Cited by 31 publications

(9 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…При формовании металлического порошка прокаткой и другими способами формования при воздействии на очаг деформации электрического тока и электромагнитного поля возникают электрофизические эффекты, упрочняющие материал и сам межчастичный контакт [7; 8]. Большую роль играют электрофизические свойства самого материала проводника, электропластичес кий эффект и другие эффекты, на что серьезное внимание обращают зарубежные и отечественные исследователи [9][10][11][12][13][14][15][16].…”

Section: рис 2 зависимость плотности брикетов из нибон-20 от температ...unclassified

Obtaining and properties of rolled products from clad powders NPG-80 and Nibon-20

Mal’tsev

Getmanovsky

2023

Izv. VUZ. Poroshk. Met.

View full text Add to dashboard Cite

Antifriction tape sealing materials (TSM) are used in the manufacture of turbines. This work studied the mechanism of the increase in thickness of rolled products. The study showed that internal oxides of powder particles, which are reduced during sintering and annealing in hydrogen, cause a change in the size of tapes and compacts from NPG-80 and Nibon-20 clad powders. The distinctive feature of powders used in the work is the presence of a nickel shell around the particle of the solid lubricant (graphite or boron nitride). It was shown that an increase in sintering temperature and heating time to isothermal holding intensifies the growth of the tapes and samples The studies carried out point to a relationship between reduction processes occurring in hydrogen during heating, sintering, and annealing of NPG-80 and Nibon-20 powders with an increase in the thickness of the tape containing the solid lubricant in its composition. An increase in the duration of heating to isothermal holding at 1150 °C is accompanied by an increase in the thickness of rolled stock. Sintering of TSM Nibon-20 in the first mode (4 h to 1150 °C) gives an increase in thickness by 5-7 %, whereas sintering in the second mode (9 h to 1150 °C) gives an increase of 12-13 %. For NPG-80, the increase in thickness is 3-7 % and 8-11 %, respectively. This leads to some decrease in the physical and mechanical properties of TSM. Lower temperatures and higher heating rates are recommended for the sintering of sheet materials from NPG-80 and Nibon-20 in the hydrogen atmosphere. The increase in thickness of TSM from clad powders NPG-80 and Nibon-20 can be avoided if the sintering (heating) is carried out under pressure. By the method of electric rolling and subsequent hot rolling TSM is obtained from Nibon-20.

show abstract

Section: рис 2 зависимость плотности брикетов из нибон-20 от температ...unclassified

Obtaining and properties of rolled products from clad powders NPG-80 and Nibon-20

Mal’tsev

Getmanovsky

2023

Izv. VUZ. Poroshk. Met.

View full text Add to dashboard Cite

show abstract

“…The influence of the electric current on the diffusivity and the free energy allows the electric current to accelerate the structural relaxation. Experiments have shown the electric effects on the hardness, tensile property, residual stresses, microstructures and dislocation density of quenched mediumcarbon steels [49] and the martensite phase in dual-phase steels [50]. The wear resistance and the corrosion behaviour in deep cryogenically treated steels have been modified due to the accelerated diffusivity of the carbon in the formation and the configuration of carbides [51].…”

Section: Electric Effect On Temperingmentioning

confidence: 99%

Critical Assessment of the Electric Effect in Electric Arc Welding

Qin

2021

Metals

View full text Add to dashboard Cite

This work provides a critical assessment of electric effects on the microstructure evolution at the heat-affected zone in electric arc welding. Electric effects are the interactions between electromagnetic fields and materials’ microstructures. They differ from the arc effect and the Joule heating effect by providing an alternative contribution to nucleation, grain growth, recrystallisation and tempering. The influence of the electric effect on grain size, defects, anisotropic properties, precipitates and residual stress has been examined kinetically and thermodynamically. The use of adaptable electric current densities, pulse durations, pulse frequencies and electrode movements is suggested to achieve desirable microstructures and mechanical properties for the weldments.

show abstract

“…11 Pan et al utilized electric current pulse to decrease the residual stress in as-quenched medium carbon steel during recovery annealing and tested the feasibility of the method. 12 Electrically assisted annealing was applied to relieve the stress in automotive springs, where the result was satisfactory. 13 Therefore, EPT is a potential method of replacing both recrystallization and recovery annealing treatment, where the results achieved after EPT depend heavily on materials and electric current parameters.…”

Section: Introductionmentioning

confidence: 99%

“…To address the equipment and workpiece transportation issues during annealing treatment, attempts have been made to replace heat treatment during annealing with electropulsing treatment (EPT). [11][12][13] Shana et al found that the grain size was refined when cold-drawing AZ31 alloy wire was treated by electropulsing annealing, and that EPT could accelerate recrystallization. 11 Pan et al utilized electric current pulse to decrease the residual stress in as-quenched medium carbon steel during recovery annealing and tested the feasibility of the method.…”

Section: Introductionmentioning

confidence: 99%

Effect of electropulsing treatment on the recovery of AZ31B magnesium alloy

Zhang

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

Electropulsing treatment (EPT) is a potential annealing method with advantages of performance improvement and equipment simplification. In the current paper, the effect of EPT on the recovery of AZ31B magnesium alloy during a two-stage plastic deformation process was studied. The tensile properties, residual stress, microstructure, and recovery kinetics were evaluated. The residual stress decreased and the cumulative elongation increased slightly, whereas the yield strength retained relatively high after EPT. A typical recovery process was observed. Moreover, the recovery kinetics was accelerated by the improved pulse current density, which led to lower residual stress and higher cumulative elongation. Thus, satisfactory recovery can be achieved by adjusting the pulse current during EPT. Analysis of the full width at half maximum (FWHM) and kernel average misorientation (KAM) indicated that the dislocation density decreased after EPT. Therefore, the pulse current has a significant impact on the dislocation mobility and annihilation, accounting for the recovery behavior of AZ31B magnesium alloy. A model of the recovery kinetics was established to demonstrate the effect of the pulse current on recovery evolution in AZ31B magnesium alloy.

show abstract

Effects of electric current pulses on mechanical properties and microstructures of as-quenched medium carbon steel

Cited by 31 publications

References 23 publications

Obtaining and properties of rolled products from clad powders NPG-80 and Nibon-20

Obtaining and properties of rolled products from clad powders NPG-80 and Nibon-20

Critical Assessment of the Electric Effect in Electric Arc Welding

Effect of electropulsing treatment on the recovery of AZ31B magnesium alloy

Contact Info

Product

Resources

About