Effect of Shot Peening on Fatigue Behavior of AISI 4340 in Different Loading Conditions

Shot peening is a method widely used to improve the fatigue strength of materials, through the creation of a compressive residual stress field (CRSF) in their surface layers. In the present research the gain in fatigue life of AISI 4340 steel, obtained by shot peening treatment, is evaluated under t...

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Veröffentlicht in:	Key Engineering Materials 2016-09, Vol.713, p.30-33
Hauptverfasser:	Cindra Fonseca, Maria P., Torres, Marcelo A.S., Harada, D.T., Baptista, Carlos Antonio Reis Pereira
Format:	Artikel
Sprache:	eng
Schlagworte:	Bending fatigue Compressive properties Compressive strength Crack initiation Engineering Fatigue (materials) Fatigue failure Fatigue life High strength steel High strength steels Metal fatigue Nickel chromium molybdenum steels Residual stress Shot peening Tensile tests Tension tests
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Beschreibung
Zusammenfassung:	Shot peening is a method widely used to improve the fatigue strength of materials, through the creation of a compressive residual stress field (CRSF) in their surface layers. In the present research the gain in fatigue life of AISI 4340 steel, obtained by shot peening treatment, is evaluated under the three different hardnesses used in landing gear. Rotating bending fatigue tests and alternating tension tests were conducted and the CRSF was measured by x-ray tensometry prior and after interrupted fatigue tests. The evaluation of fatigue life after shot peening in relation to the relaxation of CRSF, of the crack initiation sites and surface roughness is done.
ISSN:	1013-9826 1662-9795 1662-9795
DOI:	10.4028/www.scientific.net/KEM.713.30