Fatigue behavior of X70 microalloyed steel after severe shot peening

Miková, Katarína; Bagherifard, Sara; Bokůvka, Otakar; Guagliano, Mario; Trško, Libor

doi:10.1016/j.ijfatigue.2013.04.021

Cited by 105 publications

(42 citation statements)

References 23 publications

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“…The process of the creation of this layer with superior mechanical properties is characterized by three main mechanisms: work-hardening (increase in the dislocation density); introduction of compressive residual stresses; and grain refinement [1,2,4,5,8,[14][15][16][17][18]28].…”

Section: Discussionmentioning

confidence: 99%

Study of Relation between Shot Peening Parameters and Fatigue Fracture Surface Character of an AW 7075 Aluminium Alloy

Trško

Fintová

Nový

et al. 2018

Metals

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Shot peening is a well-known surface treatment method used for fatigue life improvement of cyclically loaded structural components. Since three main variables are considered in the peening process (peening intensity, coverage and peening media type), there is no direct way to choose the best combination of treatment parameters for the best performance, thus it has to be based on experience and laboratory tests. When shot peening is performed with inadequate parameters, or the peening process is not stable in time (decrease of the peening pressure, deterioration of the peening media and so on), it can result in significant degradation of the treated component fatigue properties, what is commonly called as the "overpeening" effect. When a premature fatigue fracture occurs in operation, the fracture surface analysis is usually the most important method of revealing the damage mechanism. This work is aimed at the study of the relation between the shot peening parameters and the fatigue fracture surface character on an AW 7075 aluminium alloy with an objective of identifying marks of overpeening and investigating the fatigue crack initiation mechanism. After performing the tests, it was observed that shot peening with optimized parameters creates a surface layer that is able to change the mechanism of the fatigue crack propagation and improve fatigue strength. On the other hand, using extensive peening parameters decrease the fatigue strength due to the creation of surface cracks and surface layer delamination.

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Section: Discussionmentioning

confidence: 99%

Study of Relation between Shot Peening Parameters and Fatigue Fracture Surface Character of an AW 7075 Aluminium Alloy

Trško

Fintová

Nový

et al. 2018

Metals

Self Cite

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“…Shot peening usually produces detrimental surface effects too, such as increasing roughness, nevertheless it has been shown that the average effect of both beneficial phenomena is more important than those induced by superficial detrimental effects [12,13]. Recent studies [14,15,16], demonstrated that the generation of a nanograined layer over specimens' surface results in a fatigue strength improvement. However, this is true as long as the density and size of surface defects induced by shot peening remain not significant.…”

Section: Introductionmentioning

confidence: 99%

Effect of shot peening on metastable austenitic stainless steels

Fargas

Roa

Mateo

2015

Materials Science and Engineering: A

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In this work, shot peening was performed in a metastable austenitic stainless steel EN 1.4318 (AISI 301LN) in order to evaluate its effect on austenite to martensite phase transformation and also the influence on the fatigue limit. Two different steel conditions were considered: annealed, i.e., with a fully austenitic microstructure, and cold rolled, consisting of a mixture of austenite and martensite. X-ray diffraction, electron backscattered diffraction and focus ion beam, as well as nanoindentation techniques, were used to elucidate deformation mechanisms activated during shot peening and correlate with fatigue response. Results pointed out that extensive plastic deformation and phase transformation developed in annealed specimens as a consequence of shot peening.However, the increase of roughness and the generation of microcracks led to a limited fatigue limit improvement. In contrast, shot peened cold rolled specimens exhibited enhanced fatigue limit. In the latter case, the main factor that determined the influence on the fatigue response was the distance from the injector, followed successively by the exit speed of the shots and the coverage factor.

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“…Fatigue properties of pipeline steels were obtained using the established Wöhlercurve. In other situations, a rotating bending fatigue test of X70 pipeline steels was demonstrated on smooth and notchedspecimens to evaluate the effect of treatment on fatigue strength [34]. Results were evaluated using the Basquinfunction through least square and the coefficients of the regression curves fitted technique.As the demand for new designs has increased tremendously, a number of researches have proposed different empiricalrelationships dealing with the mean stress effect on material strength under uniaxial fatigue loadings.…”

Section: Overview Of Fatigue Life Assessmentmentioning

confidence: 99%

The Effect of Dent Under Fatigue Loading in Pressurized Pipeline: A Review

2015

IJAERD

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Fatigue behavior of X70 microalloyed steel after severe shot peening

Cited by 105 publications

References 23 publications

Study of Relation between Shot Peening Parameters and Fatigue Fracture Surface Character of an AW 7075 Aluminium Alloy

Study of Relation between Shot Peening Parameters and Fatigue Fracture Surface Character of an AW 7075 Aluminium Alloy

Effect of shot peening on metastable austenitic stainless steels

The Effect of Dent Under Fatigue Loading in Pressurized Pipeline: A Review

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