A Study of the Structure and Properties of Novel Cold-Resistant High-Strength Steel for Operation Under Conditions of Intense Wear

Полецков, П. П.; Yakovleva, I. L.; Копцева, Н. В.; Kuznetsova, A.; Mikhalkina, I. V.

doi:10.1007/s11041-022-00736-7

Cited by 2 publications

(3 citation statements)

References 6 publications

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“…It is known, that wear resistance is mainly determined by steel microstructure. Combination of high values of hardness and lowtemperature impact toughness can be provided after quenching and low tempering of quenching for martensite [16][17][18][19][20].…”

Section: Results Of the Research And Discussionmentioning

confidence: 99%

“…It was shown in several researches that non-tempered martensite is characterized by increased resistance against different kinds of wear, which is connected in the conditions of friction loading with development of the processes of dynamic ageing that can lead to efficient fixing of dislocations and intensive strengthening [19][20][21][22][23].…”

Section: Results Of the Research And Discussionmentioning

confidence: 99%

“…The most part of martensite with lathe morphology in the structure can provide high strength of the examined steel, while presence of dispersed structure of low-carbon bainite can provide high parameters of resistance to destruction [17][18][19][20][21].…”

Section: Results Of the Research And Discussionmentioning

confidence: 99%

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Study of phase and structural transformations in overcooled austenite for high-strength cold resistant steel during continuous cooling

Efimova,

Emaleeva,

Gulin

et al. 2023

cisisr

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Essential part of strategic objects in oil/gas and machine-building complexes, transport industry and bridge building are operated in the conditions of simultaneous effect of low temperatures, static and dynamic loads as well as intensive wear. High-strength cold-resistance steels are considered as one of the materials, which can be used in such conditions. At present time, providing of principally new qualitative combination of properties of such steels is the actual scientific problem; the main parameters of these steels should be superior to the existing international analogues, they should present the unique combination of high strength, ductility as well as wear and cold resistance at the temperatures down to -70 °C. However, improvement of strength properties and hardness of rolled products leads to substantial decrease of cold resistance and ductility of steel; so, reaching of combination between high strength state and cold resistance is possible during definite structural and phase transformations, occurring in steels. Regularities of phase and structural transformations, occurring in high-strength cold-resistant steel with the following chemical composition (%, mass.): 0.15 C; 1.5 Mn; 0.20 Si; 1.7 (Ni+Cu); 0.035 (Ti+V+Nb); 0.0040 B during continuous cooling, were established in this research. Thermokinetic diagram of decomposition of overcooled austenite was built. It is shown, that steel with above-mentioned composition, which contains mainly if lathe martensite with small amount of bainite, is forming during continuous cooling with rate within the range 10-110 °С/с. Most part of martensite with lathe morphology can provide high strength of the researched steel, presence of dispersed structure of low-carbon bainite can provide high characteristics of resistance to brittle destruction, and hardness more than 350 HBW, which is achieved during cooling with rate more than 50 °С/с can provide high wear resistance.

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Section: Results Of the Research And Discussionmentioning

confidence: 99%

Section: Results Of the Research And Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Study of phase and structural transformations in overcooled austenite for high-strength cold resistant steel during continuous cooling

Efimova,

Emaleeva,

Gulin

et al. 2023

cisisr

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Дослідження Процесу Формування Біметалевих Виливків Дробильно-Розмельного Обладнання

Aftandiliants¹

2023

Metalozn. obrobka met.

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The analysis of the state of production of wear-resistant materials showed that one of the promising directions for improving their quality is the use of bimetallic castings, which have a complex of properties differentiated by the volume and surfaces of the products. However, the problem of obtaining a high-quality connection of the base and the working layer has not been solved until now. The article examines the influence of the chemical composition, temperature parameters, and mass ratio of alloys of bimetallic pairs on the process of bimetallic castings formation. The purpose of the study was to study the growth kinetics and structural-phase composition of the transition diffusion layers of bimetallic castings depending on the chemical composition, temperature parameters and the ratio of the masses of the alloys of the bimetallic pairs. As a research result, it was established that the formation of transition layers of bimetallic castings is determined by the processes of diffusion and structural-phase transformations in the interaction zone - "solid - liquid metal". The processes largely depends on the chemical composition of bimetallic pairs, temperature parameters, and the mass ratio of the layers. It was determined that in bimetallic castings obtained by pouring liquid metal onto a preheated solid billet, the transition layer is characterized by the presence of two zones - pearlitic, from the side of the base metal and without the carbide region of the matrix of the working layer. It has been established that the formation of transition layers in bimetallic castings obtained by successive pouring of melts into the mold through autonomous pouring systems is accompanied by the saturation of steel by carbon from cast iron to a depth of 600-800 microns and the formation of a zone with a lamellar pearlite structure along the border of the alloy junction, and the transition layer between cast iron and steel consists of pearlite in the form of a narrow strip and a zone of chromic ferrite from the side of cast iron. As a result of the study of the peculiarities of the formation of transitional layers of bimetallic castings when liquid metal is poured onto a solid billet, it was established that the degree of dissolution of the base metal in liquid cast iron increases with an increase of the billet preheating temperature and the temperature of the melt, as well as the ratio of the mass of liquid cast iron to a unit surface area of the metal base. At the same time, the rate of dissolution is proportional to the gradient between the temperatures of the contact surface and the cast iron solidus. It was established that the formation of a reliable diffusion bond for bimetallic pairs "carbon (low-alloy) steel - high-chromium cast iron" is ensured if the temperature of the contact surface exceeds the temperature of the eutectic transformation of cast iron. The mechanism is revealed of formation of the transition zone structure. The materials of the article can be used by scientists for further research and practitioners in the selection of materials for work in extreme conditions. Keywords: steel, cast iron, temperature, transitional layer, solidus, liquidus, melt, solidification.

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A Study of the Structure and Properties of Novel Cold-Resistant High-Strength Steel for Operation Under Conditions of Intense Wear

Cited by 2 publications

References 6 publications

Study of phase and structural transformations in overcooled austenite for high-strength cold resistant steel during continuous cooling

Study of phase and structural transformations in overcooled austenite for high-strength cold resistant steel during continuous cooling

Дослідження Процесу Формування Біметалевих Виливків Дробильно-Розмельного Обладнання

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