Influence of machining parameters on fatigue endurance limit of AISI 4140 steel

Lopes, Karina S. S.; Sales, Wisley Falco; Palma, Ernani Sales

doi:10.1590/s1678-58782008000100011

Cited by 10 publications

(3 citation statements)

References 25 publications

(25 reference statements)

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“…Increasing the turning feed could produce a more compressive residual stress state, thus offsetting its deleterious in uence on surface roughness (stress concentration) and leading to a similar number of cycles under fatigue. This behavior was described by Lopes et al [22], who reported the same fatigue limit after turning AISI 4140 steel with two distinct feeds (0.12 and 0.18 mm/rev).…”

Section: Number Of Cycles To Failuresupporting

confidence: 80%

Relationship between surface characteristics and the fatigue life of deep rolled AISI 4140 steel

Martins,

Oliveira,

de Castro Magalhães

et al. 2023

Int J Adv Manuf Technol

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Deep rolling is an effective and economically viable mechanical surface treatment that induces surface deformation by the action of a rolling tool. It is capable of reducing roughness, increasing hardness and inducing compressive residual stresses on the workpiece surface, thus increasing the fatigue strength of the component. This behavior, however, is only achieved with use of suitable parameters. This work investigates the surface topography and fatigue life of hardened AISI 4140 steel subjected to turning followed by deep rolling under distinct conditions. The ndings indicates that for the turned samples, roughness increases with turning feed rate, resulting in fatigue life reduction. Deep rolling promotes a roughness reduction and an increase in fatigue life and, surprisingly, the samples with the highest surface roughness after turning achieved the longest fatigue lives after deep rolling. The areal power spectral density (APSD) analysis of the surface topography was able to identify distinct effects of deep rolling for each level of pressure used. The morphology analysis indicates an initial loss of orientation, followed by the creation of a new orientation after deep rolling under high pressures. Furthermore, the interaction between deep rolling feed and deep rolling pressure presents a signi cant effect on the roughness parameters, indicating that different behaviors depend on each parameter level used. Deep rolling also affects the form of the fatigue fracture, reducing the number of nucleation sites, and modifying the nal overload fracture site.

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Section: Number Of Cycles To Failuresupporting

confidence: 80%

Relationship between surface characteristics and the fatigue life of deep rolled AISI 4140 steel

Martins,

Oliveira,

de Castro Magalhães

et al. 2023

Int J Adv Manuf Technol

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“…This effect decreases with an increase in temperature due to the relaxation of residual stress. Lopes et al [6] also stated that the fatigue limit of AISI 4140 steel decreases with increasing roughness parameters.…”

Section: Introductionmentioning

confidence: 95%

Machining Variables Influence on the Fatigue Life of End-Milled Aluminium Alloy

Ojolo

Orisaleye²,

Obiajulu³

2014

IJMSA

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Machining involves the thermal, elastic and plastic deformations of the surface layer which result in strain hardening, structural changes and development of residual stresses. These cause surface irregularities which may increase the risk of fatigue failure of material during usage. This study involves the investigation of the influence of cutting speed, feed rate and tool geometry on the fatigue life of end-milled specimens of 2024-aluminium alloy using a design of experiment approach. The experimental design constructed was such that the specimens were subjected to different machining conditions. Data analysis was carried out with Relia Soft Office TM 7 DOE++ software and Analysis of Variance (ANOVA). The study showed that by decreasing the feed rate (from 60mm/min to 7mm/min) and increasing the cutting speed (from 3.77m/min to 48.25m/min) significantly resulted in a higher fatigue life (from 1.93x10 3 cycles to 2.53x10 3 cycles). Whereas, the rake angle had the least significant effect on the fatigue life, it was discovered that the feed rate was found to be the most influential factor.

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“…Los efectos de los parámetros de corte (velocidad de corte, avance y profundidad de corte) durante el maquinado están muy bien documentados y un gran número de estudios se han realizado para estudiar los efectos de la rugosidad producida por el maquinado en el rendimiento de piezas mecá-nicas sometidas a fatiga [15], [14]. La capa superficial se somete a deformación elasto-plástica, calentamiento (que resulta en cambios estructurales), endurecimiento por deformación y estreses residuales [16]. De la Tabla 1 obtenemos los valores de potencia y torque del vehículo y de la Figura 13 las dimensiones de la sección fallada.…”

Section: A Modelo Teórico De Esfuerzosunclassified