Structure and Properties of High-Strength Low-Alloy Cold-Resistant Steel after Reheat and Direct Quenching with Tempering

Sych, O. V.; Хлусова, Е. И.; Yashina, E. A.; Svyatysheva, E. V.; Vasilieva, E. A.

doi:10.1134/s2075113320060258

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…Inhomogeneity formed during zonal, dendritic, and intragranular segregation of carbon and other alloying and impurity elements was also observed after heating for rolling. The processes occurring during thermo-mechanical treatment have a significant effect on the distribution of elements during polymorphic transformations [29,30]. This is due to the fact that during precipitation of ferrite at the final stage of rolling in the temperature range of the two-phase region, a fairly complete redistribution of these elements occurs during austenite decomposition.…”

Section: Resultsmentioning

confidence: 99%

Structural Anisotropy Parameters’ Effect on the Low-Temperature Impact Strength of Alloy Steels in Rolled Products

Kovalyova

Issagulov

Kovalev

et al. 2023

Metals

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The present work is devoted to the study of the influence of the parameters of the structural anisotropy of rolled products on the low-temperature impact strength of alloyed steels. A quantitative metallographic analysis of the microstructure of rolled steel samples obtained after testing for low-temperature toughness was carried out. It was established that the main reason for the decrease in the low-temperature impact strength of rolled steel samples is a highly developed segregation band enriched with carbon films formed at the stage of steelmaking conversion in violation of the technology of continuous casting of steel. The microstructural analysis of rolled stock samples was used in the work, and studies of the fracture surface of rolled stock samples were carried out with a scanning electron microscope using X-ray microanalysis methods. The studies carried out showed that the metallurgical quality of sheets of one heat, as well as individual samples within one sheet, varied over a wide range, from satisfactory to unacceptably low. It was established that the main reason for the decreasing low-temperature impact strength of rolled products was a highly developed segregation band enriched with carbon films, formed at the stage of steelmaking in case of violation of the continuous casting of steel technology. The multivariate statistical analysis carried out showed that only the size of the segregation band has an effect on the low-temperature impact strength of 10 mm thick rolled coil samples.

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Section: Resultsmentioning

confidence: 99%

Structural Anisotropy Parameters’ Effect on the Low-Temperature Impact Strength of Alloy Steels in Rolled Products

Kovalyova

Issagulov

Kovalev

et al. 2023

Metals

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show abstract

“…Kinds of high strength steels have been processed by direct quenching and many studies focused on the influence of the parameters of quenching proc-ess on the microstructure and mechanical properties of high strength steels [1][2][3][4][5]. While the research on temperature and microstructure uniformity during direct quenching process has been rarely reported [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of air cooling time on temperature and microstructure uniformity of 960 MPa high strength steel by direct quenching

Yang

Tang

et al. 2022

Materialwissenschaft Werkst

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In order to improve the temperature and microstructure uniformity in the thickness direction of online‐quenching 960 MPa high strength steel, the finite element software ADINA and the experiments have been used to analyze the effect of internal air cooling on temperature variation in the thickness direction during the online quenching process. The results showed that the interval air cooling could effectively improve the uniformity of temperature, microstructure and hardness in the direction of thickness of steel plate during the online quenching process. When air cooled for 3.2 s, the temperature difference between the surface and the core of the steel plate could be reduced by 90.13 %, and the cooling rate in the core could be reduced by about 85.20 % compared with continuous water cooling condition. The hardness difference between the surface and the core could reduce from 23 HV 5 to 5 HV 5. The internal air cooling process had an influence on the matensite lath morphology compared with continuous water cooling process. The microstructures with the different cooling conditions were martensite and the properties could still meet the requirements of 960 MPa high strength steel.

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Structure and Properties of High-Strength Low-Alloy Cold-Resistant Steel after Reheat and Direct Quenching with Tempering

Cited by 2 publications

References 9 publications

Structural Anisotropy Parameters’ Effect on the Low-Temperature Impact Strength of Alloy Steels in Rolled Products

Structural Anisotropy Parameters’ Effect on the Low-Temperature Impact Strength of Alloy Steels in Rolled Products

Effect of air cooling time on temperature and microstructure uniformity of 960 MPa high strength steel by direct quenching

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