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Abstract

The microalloying elements such as Nb, V are added to control the microstructure and mechanical properties of microalloyed (HSLA) steels. High chemical affinity of these elements for interstitials (N, C) results in precipitation of binary compound, nitrides and carbides and products of their mutual solubility – carbonitrides. The chemical composition of austenite, as well as the content and geometric parameters of undissolved precipitates inhibiting the growth of austenite grains is important for predicting the microstructure, and thus the mechanical properties of the material. Proper selection of the chemical composition of the steel makes it possible to achieve the required properties of the steel at the lowest possible manufacturing cost. The developed numerical model of carbonitrides precipitation process was used to simulate and predict the mechanical properties of HSLA steels. The effect of Nb and V content to change the yield strength of these steels was described. Some comparison with literature was done.
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Bibliography

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[2] European Committee for Standardization (2019). Hot Rolled Products of Structural Steels: Technical Delivery Conditions for Flat Products of High Yield Strength Structural Steels in the Quenched and Tempered Condition
[3] Jan, F., Jaka, B. & Grega, K. (2021). Grain size evolution and mechanical properties of Nb, V–Nb, and Ti–Nb boron type S1100QL steels. Metals. 11(3), 492. https://doi.org/10.3390/met11030492.
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[6] Marynowski, P., Adrian, H. & Głowacki, M. (2019) Modeling of the kinetics of carbonitride precipitation process in high-strength low-alloy steels using cellular automata method. Journal of Materials Engineering and Performance. 28(7), 4018-4025. https://doi.org/10.1007/s11665-019-04170-4.
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[8] Marynowski, P., Adrian, H. & Głowacki, M. (2013). Cellular automata model of precipitation in microalloyed niobium steels. Computer Methods in Materials Science. 13(4), 452-459. ISSN 1641-8581.
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Authors and Affiliations

Przemysław Marynowski
1
ORCID: ORCID
Marcin Hojny
1
Tomasz Dębiński
1
ORCID: ORCID

  1. AGH University of Krakow, Poland
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Abstract

Microalloying elements such as Ti, Nb, V, entered into steel they influence their microstructure and mechanical properties, because formation of carbonitrides, M(C,N). Influence of carbonitrides to the microstructure and mechanical properties depends on their basic stereological parameters: volume fraction, Vv, and their size, r. In this work the Cellular Automata model of the kinetics of the carbonitrides precipitation which enable to predict the image of the microstructure and calculate the size of carbonitrides formed during isothermal annealing of supersaturated steel is presented. In the high temperature the microalloying elements inhibit the austenite grains growth. Chemical composition of steel has influence to volume fraction and size of precipitations. The work is supplemented with examples of experimental comparison.
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Authors and Affiliations

Przemysław Marynowski
ORCID: ORCID
Marcin Hojny

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Abstract

This study investigates the effects of frequency, compression force and Vee angle parameters of High-Frequency Electric Resistance Welding (HF-ERW) process on mechanical properties of API X52 microalloy steel welding joint. Therefore, API X52 microalloy steel sheets having thickness of 8 mm was provided to manufacture pipes with the diameter of 16”. with direct weld seams using the HF-ERW method. During the manufacturing process, frequency values of 150, 200 and 250 kHz, compression forces of 2, 4 and 6 mark and Vee angles of 3°, 5°, and 7° were adopted. After changing the welding parameters, from the welded pipes, tensile and Charpy impact test samples prepared to macroscopically evaluate the weld metal flow and examine the effects of these parameters on mechanical properties of the welded joints. According to the results, it was concluded that frequency of 150 kHz, the compression force of 4 mark and Vee angle of 5° yields best mechanical properties in the HF-ERW joint of API X52 microalloy steel.

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Authors and Affiliations

M. Sabzi
A. Kianpour-Barjoie
M. Ghobeiti-Hasab
S. Mersagh Dezfuli

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