Nanoparticle influence into the structure of structural steel

Aftandiliants, Ye. G.; Lopatko, K.

doi:10.15407/mom2020.02.003

Cited by 2 publications

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“…For correct choice of material for mechanisms structures manufacture with further adding mechanical and other properties that affect reliability and workability of machines, it's necessary to know internal structure of material at micro level. Metals and alloys consist of large number of small crystals of irregular shape -grains and borders between them [3,4]. Borders between grains form inner surface of metal.…”

Section: Analysis Of Literature Data and Problem Definitionmentioning

confidence: 99%

“…Metal alloys yield strength can change with treatment by pressure, which is especially noticeable during metal rolling of cold state. During metals treatment by pressure or during heat treatment, material strength and plasticity change due to change in internal structure -grains are crushed or enlarged, and number of dislocations or vacancies decreases in grains, pores appear and disappear, that means that junction surface between grains changes in metals volume [3,4]. During cold rolling metal density usually decreases.…”

Section: Analysis Of Literature Data and Problem Definitionmentioning

confidence: 99%

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Influence of deformation degree on grains size and borders between them in metal alloys during cold rolling of sheets

Chubenko,

Saveliev,

Khinotska

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The internal structure of metal products was investigated and it was identified that it affects quality and workability of equipment parts. Changes that occur in metal products structure during cold treatment by pressure, which lead to changes in physical and mechanical properties of products, have been analyzed. It was established that grains and borders between them, which determine internal structure of metal products, change their shape and size during cold rolling, depending on percentage reduction value. It is offered to consider grain borders as amorphous layer. Methodology has been developed to study influence of deformation degree during cold rolling to grain size of metal internal structure and intergranular layer volume. Intergranular surface area, its volume and part of surface volume from metal volume were determined. Parameters of internal structure of low-carbon steel were calculated depending on reduction value during cold rolling. According to study results, interconnection between grains size and deformation degree was established; and percentage reduction influence to grain size and borders between them was determined, obtaining a minimum standard grain size with percentage reduction of over 80 %; yield strength and its growth for metal alloy during cold rolling are established, which allows controlling the strength of steel by adjusting the grain size and their junction surface. It is shown that with an increase in deformation degree, yield strength of metal product material increases in hyperbolic dependence, and fraction of amorphous layer and strength properties of low-carbon steel change almost equally in exponential functions. It is revealed that during cold rolling, it is possible to control internal properties of obtained product by adjusting reduction value.

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Section: Analysis Of Literature Data and Problem Definitionmentioning

confidence: 99%

Section: Analysis Of Literature Data and Problem Definitionmentioning

confidence: 99%

Influence of deformation degree on grains size and borders between them in metal alloys during cold rolling of sheets

Chubenko,

Saveliev,

Khinotska

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

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Iron nanoparticle influence on the structure of improved structural steel and its properties

Aftandiliants¹,

Lopatko²

2020

Metalozn. obrobka met.

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The results of the study of the effect of nanoparticles in the shell of iron oxide Fe2O3, which when injected into the melt and heated up to melt temperature is converted into oxide Fe3O4, on the microstructure of hardened and tempered steel 25GSL and its properties. It is shown that in modified steel martensite crystals thickness is reduced compared to the original steel in average 1.9 times after the quenching, tempered martensite crystal length after tempering hardened steel at 200oC - 3 times, the plate cementite length in troostite after tempering hardened steel at 450 оС – 1,4 times, the carbide length of after tempering of steel at 550 оС – 1,6 times. It has been found that modification of iron nanoparticles in a shell of Fe3O4 oxide leads to dispersion of the subgrain structure (regions of coherent scattering) and to the decrease of the crystal lattice parameters of solid solutions. The mechanism of nanoparticle influence on the reduction of the crystal lattice parameters of solid solutions, which is to accelerate the diffusion of interstitial atoms of the elements into the zones of high stress on the nanoparticles surface, is proposed. It is determined that the optimal improvement mode of the modified steel is quenching at 900 °C and tempering at 550 °C. The yield, tensile strengths and toughness of the modified steel are 894 MPa, 993 MPa and 92 J/mm2, respectively, on 62, 41 and 14% higher than the original steel. The injection of iron nanoparticles in a refractory shell into the steel melt before crystallization predetermines the effective modification and enhancement of mechanical properties. Keywords: iron nanoparticles, structure, martensite, troostite, sorbite, carbides, stresses, phase transformations.

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Nanoparticle influence into the structure of structural steel

Cited by 2 publications

References 0 publications

Influence of deformation degree on grains size and borders between them in metal alloys during cold rolling of sheets

Influence of deformation degree on grains size and borders between them in metal alloys during cold rolling of sheets

Iron nanoparticle influence on the structure of improved structural steel and its properties

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