Mechanical properties of steel 20KhN2M after laser treatment

Amulevicius, A.; Balciuniene, M.; Petrėtis, Bronius; Juzakenas, D.

doi:10.1007/bf01408596

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…The x-ray chemical analysis has shown that the alloy contains 2.78 at.% of Si, 0.3 at.% of Cr, 1.2 at.% of Mn and about 14.5 at.% of C. The microscopic studies revealed that carbon existed as the graphite insertions in the layered structure with the distance of some micrometres between the graphite layers. The structure of grey cast iron is favourable for the research because, differing from laser implantation [8], carbon does not evaporate from the surface and mixes with iron successfully. A small amount of other impurities in grey cast iron allows the successful study of the formation of the phases of martensite, iron carbides and retained austenite on the basis of this system.…”

Section: Experimental Conditionsmentioning

confidence: 99%

Mössbauer studies of Fe-Si-C system structure changes by laser and ultrasound treatment

Amulevicius

Mažeika

Daugvila

2000

J. Phys. D: Appl. Phys.

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The influence of simultaneous laser irradiation and ultrasound on the phase structure of the Fe-Si-C system (grey cast iron) was studied by means of Mössbauer spectroscopy. It has been found that the efficiency of the ultrasound influence depends on the melted layer depth (temperature). Ultrasound affects the phase structure of the melted volume, though in the surface layer, which is of the highest temperature, it does not alter the amount of martensite and iron carbide. The major effects of ultrasound are assistance in dissolving carbon and in disintegrating oversaturated γ-Fe(C) solution. It is shown that structures similar to the structure of the solid Fe(C) system should originate in the melted state.

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Section: Experimental Conditionsmentioning

confidence: 99%

Mössbauer studies of Fe-Si-C system structure changes by laser and ultrasound treatment

Amulevicius

Mažeika

Daugvila

2000

J. Phys. D: Appl. Phys.

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“…The production of magnetic nanocrystalline particles is widely investigated at present [5,6]. It has been demonstrated that material synthesis and its modification using laser radiation offer some advantages [7,8].…”

Section: Introductionmentioning

confidence: 99%

Laser-induced iron oxidation

Amulevicius¹,

Baltrūnas²,

Daugvila³

et al. 2009

Lithuanian J. Phys.

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Iron oxidation in air flux has been studied and the iron response to laser radiation has been evaluated. Effect of cooling rate on the oxide formation has been demonstrated. The Mössbauer conversion electron spectra have shown that a larger amount of oxides is formed in the surface layer. Any clearly expressed temperature dependence of the oxidation process has not been observed. It has been experimentally determined that the oxide amount depends upon the sample collection site.

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“…After the laser treatment the surface hardness of the metal increases by a factor of 3-3.5 and the wear resistance increases twofold compared to the initial value, which is associated with grain disintegration [23].…”

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confidence: 99%

Modern high-strength steels for heavily loaded gearing (a review of engineering patents)

Voronenko

1996

Met Sci Heat Treat

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In order to increase the service life of machines the life of their pans should be increased. For example, in machine tool and lifting-and-transport manufacture the maintenance cost of the equipment over the duration of its operation often exceeds the cost of the new equipment by a factor of I0-20. This imposes strict requirements on structural materials for heavily loaded gearings, including the development of high-strength, wear-resistant, manufacture-adaptable, and economically alloyed steels.Heavily loaded gearings are critical parts in the composite structure of gears and transmissions in the automobile and tractor industries, metallurgical and mining equipment, the aircraft industry, and other production [!]. An analysis of failures in the operation of such gearings shows that the steel for these parts should possess a set of properties that provide their reliability and long service life [2,3]. In the process of operation a gearing is subjected to a complex action of forces that cafise elastic and plastic deformations, cold-hardening, embrittlement, low-and high-cyclic fatigue, dynamic aging, self-tempering due to thermal effects, changes in the chemical composition of the surface layer with subsequent oxidation, and other phenomena [4]. It has been shown in [5] that the endurance of the steel used for highly loaded gearings is characterized by a group of factors the most important of which are strength and ductility, which determine the fracture energy capacity. The fracture energy capacity is determined by the simplified criterion K = cy b ~I/, which characterizes the fracture strength of the steel.It should be noted that generalizing and systematizing data on steels for heavily loaded gearings are scarce and exchange of results of relevant investigations is limited. Introduction of new materials of elevated quality and reliability should increase the endurance of gearings, reduce the idle time of equipment due to emergency repairs, decrease the probability of malfunction, and guarantee safe operation of machines. In some cases the structural steels used at present for gearings with a tooth modulus > 8 mm do not provide the requisite level of properties and are poorly adaptable to manufacture [2].Modem materials for heavily loaded gearings should meet strict requirements on such properties as the surface hardness before and after strengthening, hardness of the core, static and dynamic strengths of the surface and the core, bending resistance of the teeth, fracture characteristics, elastic and plastic properties, impact strength of the surface layer and the core, and especially the temperature 7"50, fatigue resistance (at a sufficient isotropy of the properties), wear resistance, adaptability to manufacture, and structural and operational stability.The main cause of failure in gearing of machines that operate in an abrasive medium is abrasive wear. For example, under intense operation the teeth of wheels of crane and exca- . Gearings lose their operating capacity due to damage to the teeth, broken contact...

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Mechanical properties of steel 20KhN2M after laser treatment

Cited by 4 publications

References 1 publication

Mössbauer studies of Fe-Si-C system structure changes by laser and ultrasound treatment

Mössbauer studies of Fe-Si-C system structure changes by laser and ultrasound treatment

Laser-induced iron oxidation

Modern high-strength steels for heavily loaded gearing (a review of engineering patents)

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