Issues »  Volume 46, Issue 1

Influence of Austenitization Temperature, Taking into Account Grain Size, on the Level of Regulated Mechanical Properties of Structural Alloyed Steels

V. Yu. Ol’shanets’kyy$^{1}$, I. M. Kunyts’ka$^{2}$, Yu. I. Kononenko$^{1}$, A. A. Skrebtsov$^{1}$

$^{1}$Zaporizhzhia Polytechnic National University, 64 Zhukovsky Str., UA-69063 Zaporizhzhya, Ukraine
$^{2}$State Enterprise Ukrainian Special Steels Institute, 74-A Patriotychna Str, UA-69005 Zaporizhzhya, Ukraine

Received: 27.09.2023; final version - 01.11.2023. Download: PDF

As shown for structural improvable steel 40ХН2МА-Ш, the regulated mechanical properties of the material are achieved at an austenitization temperature of 850°C in the process of heating for quenching due to the formation of a microstructure with the magnitude of the initial austenitic grain with number 8–9. As found, the grain with number 5 obtained by heating above standard quenching temperatures does not provide the necessary mechanical properties of 40XH2MA-Ш steel. The obtained data correlate well with the known results of studies of this steel. The requirement given in the technical specifications, namely, ‘the size of the austenitic grain should be no larger than number 5’ is intended for the material of the workpiece. This standard cannot be used for structural steels after final heat treatment. With this in mind, it is proposed to carry out the inspection of parts made of 40ХН2МА-Ш steel and other structural steels in compliance with the requirements of technical specifications, namely, to test mechanical properties.

Key words: structural alloyed steel, medium-carbon high-quality steel, thermal improvement, responsible parts, aircrafts, specifications, austenitic grain, mechanical properties.

URL: https://mfint.imp.kiev.ua/en/abstract/v46/i01/0047.html

DOI: https://doi.org/10.15407/mfint.46.01.0047

PACS: 61.72.Mm, 62.20.fk, 62.20.Qp, 81.40.Cd, 81.40.Ef, 81.70.Bt, 83.50.Uv

Citation: V. Yu. Ol’shanets’kyy, I. M. Kunyts’ka, Yu. I. Kononenko, and A. A. Skrebtsov, Influence of Austenitization Temperature, Taking into Account Grain Size, on the Level of Regulated Mechanical Properties of Structural Alloyed Steels, Metallofiz. Noveishie Tekhnol., 46, No. 1: 47—59 (2024) (in Ukrainian)

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