10.14489/td.2018.09.pp.004-010

2018, 09 September

DOI: 10.14489/td.2018.09.pp.004-010

Evstifeeva V. V., Mishakin V. V.
DETERMINATION OF MECHANICAL PROPERTIES OF STEEL 38HN3MFA BY METHOD ULTRASONIC TESTING
(pp. 4-10)

Abstract. Influence of heat treatment modes on mechanical and acoustic characteristics of 38HN3MFA structural steel was investigated. Correlation is established between critical stress intensity factor K1C and ultrasonic attenuation. Besides, correlation dependences are found between the conditional yield point σ0,2, ultimate strength σВ and transverse ultrasonic wave velocity of 38HN3MFA steel. The dependences found enable to assess the influence of heat treatment on durability parameters using the acoustic method of nondestructive examination. The deviation of the calculated values of K1C, derived from the acoustic measurement data, from the experimental values averages 16,6 %. It is established that the remaining mechanical parameters (σ0,2, σв, KCU) do not correlate with attenuation of ultrasonic waves. Correlations between the yield point σ0,2, the strength limit σв, the impact strength KCU and the velocity of transverse elastic waves have been found. The deviation of the calculated values of σ0,2, σв and KCU, derived from the acoustic measurement data, from the experimental ones, averages 1,95 %, 1,92 %, and 4,7 %, respectively.

Keywords: non-destructive testing, wave velocity, attenuation of ultrasonic waves, yield point, ultimate strength, heat treatment, tempering.

+ - About the Authors Click to collapse

V. V. Evstifeeva (Joint Stock Company Central Research Institute “BUREVESTNIK”, Nizhny Novgorod, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.
V. V. Mishakin (Mechanical Engineering Research Institute of RAS – Branch of Federal State Budgetary Scientific Institution “Federal Research Center The Institute of Applied Physics of the RAS”, Nizhny Novgorod, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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