The effect of artificial defects on the fatigue characteristics of AISI 4340 steel

Yakov B Unigovski; Dmitry Fishman; Liat Fishman; Liron Shichman; Ofir Moshe; Roni Shneck; Emmanuel Gutman

doi:10.55713/jmmm.v31i3.1128

ผู้แต่ง

Yakov B Unigovski Ben-Gurion University of the Negev, 84105, Department of Materials Engineering, Beer-Sheva, Israel.
Dmitry Fishman Materials Science and Engineering Division, Depot 22, Israel Air Force, P.O. Box 02538, Tel Aviv, Israel.
Liat Fishman Ben-Gurion University of the Negev, 84105, Department of Materials Engineering, Beer-Sheva, Israel.
Liron Shichman Ben-Gurion University of the Negev, 84105, Department of Materials Engineering, Beer-Sheva, Israel.
Ofir Moshe Ben-Gurion University of the Negev, 84105, Department of Materials Engineering, Beer-Sheva, Israel.
Roni Shneck Ben-Gurion University of the Negev, 84105, Department of Materials Engineering, Beer-Sheva, Israel.
Emmanuel Gutman Ben-Gurion University of the Negev, 84105, Department of Materials Engineering, Beer-Sheva, Israel.

DOI:

https://doi.org/10.55713/jmmm.v31i3.1128

คำสำคัญ:

Low alloy steel, High cyclic fatigue, Surface roughness, Artificial defects, Shot peening

บทคัดย่อ

This study examined the fatigue life (Nf) and fatigue limit (FL) of AISI 4340 steel in relation to surface roughness, artificial defects and shot peening. Artificial surface defects on fatigue specimens were obtained by electrical discharge machining (EDM) or by pre-corrosion in 3.5% NaCl and perchloric acid solutions, followed by a fatigue test. The presence of artificial defects of various sizes, taken into account by the

area parameter, led to a significant decrease in fatigue characteristics, while shot peening contributed to their noticeable improvement. Defects resulting from electrochemical corrosion had a much greater negative effect on fatigue life than defects introduced by EDM.

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