Effect of Cooling Rate during Heat Treatment on Martensitic-Bainitic Class Alloy Steel Microstructure and Properties

Майсурадзе, М. В.; Куклина, А. А.; Рыжков, М. А.; Лебедев, Д. И.; Antakov, E. V.

doi:10.1007/s11015-022-01402-2

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…Domestic and foreign scholars have never interrupted their research on steel-strengthening processes. Applying modern heat treatment technology to improve the strength and toughness of low-carbon steel [1][2][3][4][5][6], this paper used different heat treatment process parameters to heat treat low-carbon steel Q235A and analyzed the changes in microstructure and hardness of Q235A steel under different heat treatment processes. The research in this paper had both theoretical and practical significance.…”

Section: Introductionmentioning

confidence: 99%

Research on the heat treatment process of Q235A steel

Wang

2024

J. Phys.: Conf. Ser.

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Q235A steel was heat treated by using different heat treatment process parameters. The microstructure after heat treatment was observed microscopically and its hardness was measured. The results indicated that the complete austenitization temperature has not been reached at 850°C and even under water-cooled conditions, only a very small amount of martensite can be obtained. After water cooling at 900°C, 950°C, and 1000°C, lath martensite can be obtained, which made the hardness of water cooling significantly higher than that of oil cooling, air cooling, and furnace cooling. The quenching temperature of 1000°C was too high and the microstructure obtained after water cooling, oil cooling, air cooling, and furnace cooling was relatively coarse, which was not suitable as the heating temperature for heat treatment of Q235A steel.

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Section: Introductionmentioning

confidence: 99%

Research on the heat treatment process of Q235A steel

Wang

2024

J. Phys.: Conf. Ser.

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Microstructure and mechanical property formation of heat treated low-carbon chromium-nickel-molybdenum steels

Maisuradze,

Kuklina,

Nazarova

et al. 2024

Metallurgist

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Supercooled austenite transformations in a considerable steel for a special engineering products

Ryzhkov,

Maisuradze,

Kuz'minykh

et al. 2024

Černaâ metallurgiâ. Bûlletenʹ naučno-tehničeskoj informacii

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The advantages, disadvantages and some features of a dilatometric method for studying the transformation of supercooled austenite in steels under continuous cooling are briefly discussed. The continuous cooling transformation diagram of the steel under consideration containing 0.50 wt. % C, 0.25 Si, 0.65 Mn, 0.75 Cr, 1.30 Ni and 0.15 Mo, respectively was plotted based on experimental data obtained upon dilatometer measurements carried out with dif-ferent cooling rates (0.1, 0.3, 1, 5, 30 K/s) on the Linseis L78 RITA dilatometer. According to the obtained dilatometer curves, the degree of transformation was calculated in accordance with the standard method, its disadvantages and possible ways to eliminate them are noted. Additionally for the proper design of the continuous cooling transformation diagram of supercooled austenite metallographic examination and hardness tests were carried out after various heat treatment modes. A qualitative description of the formed microstructures was performed in order to confirm the obtained dilatometer data. The “tangent method” was also employed to determine the critical temperatures upon heating at the rate of 0.1 K/s and the temperature of the of the martensite start temperature upon cooling from the austenitization temperature of 880 °C, based on the literature data the application of the implemented method is justified. Some recommendations are presented as possible methods for selecting the dimensions of parts for which the steel under consideration was planned to be used. Using the example of a billet with diameter of 50 mm, from which samples were machined for research, the possibility of practical application of one of the methods for determining the type of structures formed along the cross section of steel products under continuous cooling from the austenitic region is shown.

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Effect of Cooling Rate during Heat Treatment on Martensitic-Bainitic Class Alloy Steel Microstructure and Properties

Cited by 4 publications

References 15 publications

Research on the heat treatment process of Q235A steel

Research on the heat treatment process of Q235A steel

Microstructure and mechanical property formation of heat treated low-carbon chromium-nickel-molybdenum steels

Supercooled austenite transformations in a considerable steel for a special engineering products

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