[Kovove materialy - Metallic materials]
    Fri - April 12, 2024 - 22:25 No. of hits : 1740511 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 61 (2023), Issue 6

Effect of heat treatment on the microstructure and fatigue behaviour of AISI 4130 steel
JAKUB POLOPRUDSKY, ALICE CHLUPOVA, IVO SULAK, KAREL OBRTLIK
vol. 61 (2023), no. 6, pp. 401 - 407
DOI: 10.31577/km.2023.6.401

Abstract
AISI 4130 steel is widely used in the aircraft industry, mainly for frame structures. It is a medium carbon low-alloyed (25CrMo4) steel predetermined for precipitation of carbides in the microstructure during heat treatment. Six different heat treatments were applied to study the effect of the resulting microstructure (ferritic-pearlitic in a normalised state or martensitic with carbides in a hardened state) on the fatigue life of AISI 4130. Tension-tension cycling under force control was used to determine the S-N curve of flat specimens with a central circular notch. The best fatigue properties were achieved for the material state HT125, i.e., hardened & tempered to 125 ksi (863 MPa), exhibiting the maximum stress at a fatigue limit of 225 MPa, which is approximately 5-15 % better compared to the rest of the applied heat treatments. Microstructural investigations using scanning electron microscopy explained the acquired fatigue life results of AISI 4130 concerning different heat-treated conditions.

Key words
medium carbon steel, heat treatment, fatigue life, microstructure, scanning electron microscopy

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


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