Volumetric changes at heating in steel 60Si2CrV, subjected to Q-n-P treatment

Vadim Ivanovich Zurnadzhy; Vasily Georgievich Efremenko; Michail Nikolaievich Brykov; Victoria Grigorievna Gavrilova; Elena Valentinovna Tsvetkova

Volumetric changes at heating in steel 60Si2CrV, subjected to Q-n-P treatment

Vadim Ivanovich Zurnadzhy, Vasily Georgievich Efremenko, Michail Nikolaievich Brykov, Victoria Grigorievna Gavrilova, Elena Valentinovna Tsvetkova

Abstract

The paper presents the results of investigation of phase-structural transformations and volumetric changes that occur during heating in high-silicon spring steel 60Si2CrV subjected to Q-n-P treatment. The chemical composition of steel was of 0.53 % C; 1.46 % Si; 0.44 % Mn; 0.95 % Cr; 0.10 % V; 0.016 % S; 0.013 % P. Steel samples were subjected to Q-n-P treatment as follows: a) austenitization at 880 °C, b) quenching with the cooling stop at 120, 160, 200 and 240 °C, c) subsequent holding at 220, 250 and 300 ^оС with duration from 10 to 3600 s, d) final cooling in water. The volumetric changes during heating were studied using an optical differential dilatometer at a heating rate of 1 K/s. As a reference, a sample of the same steel stabilized by high tempering was used. The amount of retained austenite was determined by X-ray diffraction using a diffractometer DRON-3 with Fe radiation. It is found that on the heating curves of Q-n-P samples, the sections corresponding to different transformations during tempering are clearly identified. On the dilatograms of the Q-n-P samples, the dilatometric effect corresponding to the second transformation during tempering (270-430 °C) was found to be increased dramatically, indicating an increase in retained austenite amount compared to the quenched state as a result of Q-n-P treatment (as confirmed by X-ray study). At the same time, the value of the effect corresponding to the third transformation during tempering was found to be decreased. To obtain the maximum amount of retained austenite in 60С2ХФА steel, the partitioning temperature should be of 260-300 ^оС, while the quenching completion temperature should be of 160-240 ^оС. The amount of retained austenite rises substantially as the quenching temperature increases. The duration of the partitioning stage should be selected taking into account the extreme character of the austenite dependence on the partitioning time. As a result of the work, an effective applicability of the dilatometric method for analyzing the steel structural state and choosing the optimal mode of Q-n-P treatment was demonstrated.

Keywords

Q-n-P treatment, quenching, dilatometry, retained austenite, martensite, carbon partitioning, tempering transformations

About the Authors

Vadim Ivanovich Zurnadzhy

Priazovskyi State Technical University
Ukraine
PhD student of the Department of Materials Science and Perspective Technologies

Vasily Georgievich Efremenko

Priazovskyi State Technical University
Ukraine

Doctor of Science, Head of Physics Department,

Professor of the Department of Materials Science and Perspective Technologies

Michail Nikolaievich Brykov

Zaporozhie National Technical University
Ukraine

Doctor of Science, Professor of the Department of Welding

Victoria Grigorievna Gavrilova

Priazovskyi State Technical University
PhD, Head of the Department of Materials Science and Perspective Technologies

Elena Valentinovna Tsvetkova

Priazovskyi State Technical University
Ukraine
PhD, Dozent of Physics Department

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Zurnadzhy V.I., Efremenko V.G., Brykov M.N., Gavrilova V.G., Tsvetkova E.V. Volumetric changes at heating in steel 60Si2CrV, subjected to Q-n-P treatment. Izvestiya. Ferrous Metallurgy. 2019;62(1).

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	Title	Рис. 1.
	Type	Исследовательские инструменты
Brief description	Рис. 1. Дифференциальные дилатометрические кривые нагрева стали 60С2ХФА в закаленном состоянии и после Q-n-P (Q = 160 оС, Р = 300 оС, выдержка 300 с). Fig. 1. Differential dilatometric heating curves of 60Si2CrV steel in as-quenched state and after Q-n-P treatment (Q = 160 ^оС, Р = 300 ^оС, partitioning time 300 s).
	Date	2017-08-14

	Title	Рис.2а
	Type	Результаты исследования
Brief description	Рис. 2. Дифференциальные дилатометрические кривые нагрева стали 60С2ХФА, подвергнутой Q-n-P обработке с «рartitioning» при 260 ^оС и «quenching» при 120 ^оС (а), 160 ^оС (б), 200 ^оС (в) и 240 ^оС (г). Fig. 2. Differential dilatometric heating curves of 60Si2CrV steel Q-n-P treated with «partitioning» at 260 ^оС and «quenching» at 120 ^оС (а), 160 ^оС (b), 200 ^оС (c) и 240 ^оС (d).
	Date	2017-08-14

	Title	Рис.2б
	Type	Результаты исследования
Brief description	Рис. 2. Дифференциальные дилатометрические кривые нагрева стали 60С2ХФА, подвергнутой Q-n-P обработке с «рartitioning» при 260 ^оС и «quenching» при 120 ^оС (а), 160 ^оС (б), 200 ^оС (в) и 240 ^оС (г). Fig. 2. Differential dilatometric heating curves of 60Si2CrV steel Q-n-P treated with «partitioning» at 260 ^оС and «quenching» at 120 ^оС (а), 160 ^оС (b), 200 ^оС (c) и 240 ^оС (d).
	Date	2017-08-14

	Title	Рис.2в
	Type	Результаты исследования
Brief description	Рис. 2. Дифференциальные дилатометрические кривые нагрева стали 60С2ХФА, подвергнутой Q-n-P обработке с «рartitioning» при 260 ^оС и «quenching» при 120 ^оС (а), 160 ^оС (б), 200 ^оС (в) и 240 ^оС (г). Fig. 2. Differential dilatometric heating curves of 60Si2CrV steel Q-n-P treated with «partitioning» at 260 ^оС and «quenching» at 120 ^оС (а), 160 ^оС (b), 200 ^оС (c) и 240 ^оС (d).
	Date	2017-08-14

	Title	ЛИцензионный договор
	Type	Исследовательские инструменты
	Date	2017-08-14

	Title	Рис.2г
	Type	Результаты исследования
Brief description	Рис. 2. Дифференциальные дилатометрические кривые нагрева стали 60С2ХФА, подвергнутой Q-n-P обработке с «рartitioning» при 260 ^оС и «quenching» при 120 ^оС (а), 160 ^оС (б), 200 ^оС (в) и 240 ^оС (г). Fig. 2. Differential dilatometric heating curves of 60Si2CrV steel Q-n-P treated with «partitioning» at 260 ^оС and «quenching» at 120 ^оС (а), 160 ^оС (b), 200 ^оС (c) и 240 ^оС (d).
	Date	2017-08-14

	Title	Рис.3
	Type	Результаты исследования
Brief description	Рис. 3. Дифрактограммы образцов стали 60С2ХФА в состоянии закалки и Q-n-P-обработки. Fig. 3. XRD patterns of 60Si2CrV steel in as-quenched state and after Q-n-P treatment P (Q = 160 ^оС, Р = 300 ^оС, partitioning time 300 s).
	Date	2017-08-14

	Title	Рис.4а
	Type	Результаты исследования
Brief description	Рис. 4. Величина эффекта ВС на дилатограммах Q-n-P-образцов в зависимости от длительности выдержки на стадии «partitioning» (а-г) для различной температуры Q: 120 ^оС (а), 160 ^оС (б), 200 ^оС (в), 240 ^оС (г). Максимальная величина эффекта ВС в зависимости от температуры Q (д). Fig. 4. The values of BC effect on dilatometric curves of Q-n-P-treated specimens as a function of partitioning duration (a-c) for quenching at 120 ^оС (а), 160 ^оС (b), 200 ^оС (c), 240 ^оС (d). The maximum values of BC effect as a function of quenching temperature (е).
	Date	2017-08-14

	Title	Рис.4б
	Type	Результаты исследования
Brief description	Рис. 4. Величина эффекта ВС на дилатограммах Q-n-P-образцов в зависимости от длительности выдержки на стадии «partitioning» (а-г) для различной температуры Q: 120 ^оС (а), 160 ^оС (б), 200 ^оС (в), 240 ^оС (г). Максимальная величина эффекта ВС в зависимости от температуры Q (д). Fig. 4. The values of BC effect on dilatometric curves of Q-n-P-treated specimens as a function of partitioning duration (a-c) for quenching at 120 ^оС (а), 160 ^оС (b), 200 ^оС (c), 240 ^оС (d). The maximum values of BC effect as a function of quenching temperature (е).
	Date	2017-08-14

	Title	Рис.4в
	Type	Результаты исследования
Brief description	Рис. 4. Величина эффекта ВС на дилатограммах Q-n-P-образцов в зависимости от длительности выдержки на стадии «partitioning» (а-г) для различной температуры Q: 120 ^оС (а), 160 ^оС (б), 200 ^оС (в), 240 ^оС (г). Максимальная величина эффекта ВС в зависимости от температуры Q (д). Fig. 4. The values of BC effect on dilatometric curves of Q-n-P-treated specimens as a function of partitioning duration (a-c) for quenching at 120 ^оС (а), 160 ^оС (b), 200 ^оС (c), 240 ^оС (d). The maximum values of BC effect as a function of quenching temperature (е).
	Date	2017-08-14

	Title	Рис.4г
	Type	Результаты исследования
Brief description	Рис. 4. Величина эффекта ВС на дилатограммах Q-n-P-образцов в зависимости от длительности выдержки на стадии «partitioning» (а-г) для различной температуры Q: 120 ^оС (а), 160 ^оС (б), 200 ^оС (в), 240 ^оС (г). Максимальная величина эффекта ВС в зависимости от температуры Q (д). Fig. 4. The values of BC effect on dilatometric curves of Q-n-P-treated specimens as a function of partitioning duration (a-c) for quenching at 120 ^оС (а), 160 ^оС (b), 200 ^оС (c), 240 ^оС (d). The maximum values of BC effect as a function of quenching temperature (е).
	Date	2017-08-14

	Title	Сведения об авторах
	Type	Данные
	Date	2017-08-14

	Title	Рис.4д
	Type	Результаты исследования
Brief description	Рис. 4. Величина эффекта ВС на дилатограммах Q-n-P-образцов в зависимости от длительности выдержки на стадии «partitioning» (а-г) для различной температуры Q: 120 оС (а), 160 оС (б), 200 оС (в), 240 оС (г). Максимальная вели-чина эффекта ВС в зависимости от температуры Q (д). Fig. 4. The values of BC effect on dilatometric curves of Q-n-P-treated specimens as a function of partitioning duration (a-c) for quenching at 120 оС (а), 160 оС (b), 200 оС (c), 240 оС (d). The maximum values of BC effect as a function of quenching temperature (е).
	Date	2017-08-14

	Title	Авторский договор Сталь
	Date	2017-08-15

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Izvestiya. Ferrous Metallurgy

Volumetric changes at heating in steel 60Si2CrV, subjected to Q-n-P treatment

Abstract

Keywords

About the Authors

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