Simulation of Structure Formation Processes of Dissimilar Steels Welded Joints Using an Intermediate Layer

Никулина, А. А.; Skeeba, Vadim; Chevakinskaya, Alexandra; Komarov, Pavel

doi:10.4028/www.scientific.net/amm.788.218

Cited by 3 publications

(5 citation statements)

References 29 publications

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“…The formation of martensite occurs due to diffusion processes caused by a significant difference in the chemical composition of steels. During welding, the alloying elements Cr and Ni actively diffuse from the local areas with their high content into the surrounding carbon steel [8,15]. The width of the transition region from the visible interface between steels may reach 500 µm.…”

Section: Resultsmentioning

confidence: 99%

“…The probability of unfavorable structure formation is reduced by the use of the explosion welding technique due to a high speed of the process, but, at the same time, the appearance of mixed zones of welded materials is not excluded [10][11][12][13][14]. Contact welding defects are an intensive mechanical mixing of materials due to the applied load, and diffusion processes [8,[15][16][17]. A complex transition zone of the weld is formed as a result of these effects.…”

Section: Introductionmentioning

confidence: 99%

“…Several factors influence the formation of structural components in the weld. The most important of these are a heating temperature, a cooling rate, and the degree of deformation [8,10,15].…”

Section: Introductionmentioning

confidence: 99%

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Formation of a Transition Zone Structure in Welded Joints between Dissimilar Steels

Никулина

Smirnov

Chevakinskaya

2014

AMM

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The results of structural research of welded joints between pearlitic high-carbon steel and austenitic chrome-nickel steel obtained by contact welding are presented. As a result of the diffusion process and mechanical mixing of steels local alloyed areas surrounded by pearlitic colonies of high-carbon steel are formed in the transition zone of the weld. The transmission electron microscopy (TEM) has been employed. The formation of the austenitic-martensitic microstructure occurs due to reducing the amount of alloying elements in local areas as compared to the original austenitic chrome-nickel steel chemical composition. Both austenite and martensite have crystallographic characteristics with the following orientation relationships: [211] γ-Fe || [011] α-Fe; [11-1] γ-Fe || [-110] α-Fe. The presence of high-strength local regions in the transition area may lead to a significant reduction in сrack resistance of dissimilar steels welded joints.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Formation of a Transition Zone Structure in Welded Joints between Dissimilar Steels

Никулина

Smirnov

Chevakinskaya

2014

AMM

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“…According to the results of mathematical modeling, cracking occurs most likely in these regions, too. 28,29 Given that railway crossings are subjected to impact and cyclic loading, tests of fatigue crack resistance and impact toughness of the welds were performed.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and fracture behaviour of flash butt welds between dissimilar steels

Никулина

Батаев

Smirnov

et al. 2015

Science and Technology of Welding and Joining

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Flash butt welds between high carbon steel and chrome-nickel steel were studied in this article. Light and electron microscopic studies have shown that the welded joints have a complex structure consisting of several phases. In addition to pearlite colonies, austenite microvolumes and regions of high strength martensite, the welds contain brittle inclusions of titanium sulphide and carbide particles. The mechanical behaviour of the welded joints is negatively influenced by the dramatic change in hardness in the weld zone. Fractographic analysis of dynamically fractured welds between carbon steel and stainless steels has shown that the fracture in the weld samples occurs in both steels. This behaviour of the material is caused by the non-uniform distribution of martensitic regions within the weld. The formation of martensitic regions in the structure of the material is a major cause of the reduction in the fatigue crack resistance of the welded joints.

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“…This method allows regulating and conducting flash welding at maximum useful power during the welding process [5]. The method of resistance welding is more economical and technologically advanced, as it allows for control of the largest number of technological parameters directly in the production process [6,7].…”

Section: Introductionmentioning

confidence: 99%

Study of Melting Methods by Electric Resistance Welding of Rails

Rezanov¹,

Martyushev

Кукарцев

et al. 2022

Metals

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An analysis of the results of rail operation shows that up to a third of all rail breaks in the railway line and up to 12.9% of all withdrawn acute defective rails are associated with welded joints. This is largely explained by the formation of structures with martensite sections in the welded joints of rails and the formation of burns. This work presents the results of studying welded joints, obtained under three welding modes (continuous flash welding, pulsating flash welding and combined flash welding). The conducted studies have shown that the flash welding mode significantly influences both the cooling rate value and the very nature of the thermal cycle of the welded joint as a whole. Changes in the cooling rate under different modes exert a significant influence on the structure and properties of the weld. Resistance welding of rails from the steel grade E76HGF by pulsating flash welding can result in the appearance of needle martensite areas, which is the reason for increased embrittlement of the weld and a decrease in its properties. The conducted field experiments have reliably shown that in the conditions of the combined welding mode it becomes possible to avoid these problems. Moreover, a slight increase in the mechanical properties of the weld in the range of 2–4% has been experimentally recorded, and the destructive load of the welded joint of the rail increases by 2–3% at high values of the bending deflection. In turn, these factors allow a significant reduction in the number of cases of rail welded-joint failures in real conditions of their operation.

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Simulation of Structure Formation Processes of Dissimilar Steels Welded Joints Using an Intermediate Layer

Cited by 3 publications

References 29 publications

Formation of a Transition Zone Structure in Welded Joints between Dissimilar Steels

Formation of a Transition Zone Structure in Welded Joints between Dissimilar Steels

Microstructure and fracture behaviour of flash butt welds between dissimilar steels

Study of Melting Methods by Electric Resistance Welding of Rails

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