Effect of severe shot peening on ultra-high-cycle fatigue of a low-alloy steel

Trško, Libor; Bokůvka, Otakar; Nový, František; Guagliano, Mario

doi:10.1016/j.matdes.2013.12.035

Cited by 90 publications

(66 citation statements)

References 24 publications

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“…Over the past three decades, the microstructure of AW 7075 has been well characterized, along with the corresponding physical metallurgy. The literature gives evidence supporting the presence of the following intermetallic phases in 7xxx series alloys (not all are simultaneously present, and temper and precise composition will regulate their types and shape): MgZn 2 32 Zn 49 , and Mg(AlCu) [22,24,25]. Due to deformation texture created during the extrusion process, the particles of intermetallic phases are mainly aligned in lines, when referred to the longitudinal cut ( Figure 1a).…”

Section: Introductionmentioning

confidence: 94%

“…Treatment with each intensity was done on two ultrasonic fatigue test specimens used for fatigue tests at 20 kHz frequency (Lasur, Asnières, France) [26] (Figure 2). Dimension marked "A" defines the length of the shot peened surface area and dimension marked "B" was adjusted to harmonize the resonance frequency of the specimen with the resonance frequency of the ultrasonic horn used [2,26]. Fatigue tests were carried out at two loading stress levels: σa = 185 MPa and σa = 176 MPa.…”

Section: Metals 2018 8 X For Peer Review 3 Of 19mentioning

confidence: 99%

“…In many studies, the positive effect on fatigue life of all sorts of engineering materials, such as steels [2][3][4], aluminium [5,6], magnesium [7,8], titanium [9] and nickel [10] alloys, was proven. The fatigue life improvement is a result of a complex modification of the surface layer's structural state by increasing the dislocation density (deformation strengthening), grain refinement, and by accumulation of the compressive residual stresses, which slow down the fatigue crack initiation process and increase the resistance to fatigue crack propagation in the early stages of fatigue damage [11,12].…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 94%

Section: Metals 2018 8 X For Peer Review 3 Of 19mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…Veľký počet dopadov guľôčok a prekrytie jamiek vytvorí pod povrchom rovnomerné tlakové napätie. Pretože väčšina porušení súčiastky únavou alebo koróziou pod napätím sa iniciuje na povrchu, tlakové napätie indukované tryskaním predlžuje čas potrebný na iniciáciu trhliny a tým aj celkovú životnosť súčiastky alebo zariadenia z hľadiska porušenia únavou materiálu [15][16][17][18]. O vplyve technológie tryskania na korózne vlastnosti povrchu ocele Domex 700 patriacej do skupiny HSLA ocelí však nenájdeme žiadnu relevantnú publikáciu, a preto sme sa tejto problematike rozhodli venovať v tejto štúdii.…”

Section: úVodunclassified

Electrochemical Corrosion Characteristics of High Strength Low Alloy Domex 700 Steel After Mechanical Surface Treatment in Chloride Environment

Borko

Pastorek

Hadzima

2017

Koroze a Ochrana Materialu

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162 Czech AssociaƟon of Corrosion Engineers ÚVODV súčasnej dobe je trendom nahrádzať bežné konštrukčné ocele vysokopevnými nízko legovanými (HSLA) oceľami. Pri použití HSLA (vysokopevné nízkolegované ocele) ocelí namiesto bežných uhlíkových ocelí je možné ušetriť až 20 % hmotnosti pri zachovaní vysokej pevnosti, tuhosti a húževnatosti konštrukcie. Vysokopevné nízkolegované ocele boli vyvinuté predovšetkým ako náhrada nízkouhlíkovej a uhlíkovej ocele pre automobilový priemysel s cieľom zlepšiť pomer pevnosti k hmotnosti a tým znížiť hmotnosť konštruk-cie. Vysoká pevnosť a vysoké mechanické vlastnosti nie sú dosiahnuté prostredníctvom vysokého obsahu legujúcich prvkov, ale predovšetkým riadeným tepelným a termo-mechanickým spracovaním. Jedná sa o nízko alebo o mikrolegované ocele a obsah legujúcich prvkov nepresahuje 0,25 % (mikrolegované) a 5 % (nízkolegované). Obsah uhlíka sa pohybuje v rozmedzí 0,05-0,25 % C [1][2][3][4][5].Existuje mnoho druhov mechanického spracovania povrchu konštrukčných materiálov [9]. Jednou z metód, ktorá sa zaraďuje medzi mechanické opracovania povrchu je brúsenie predstavujúce abrazívnu technológiu, prostredníctvom ktorej je možné povrch materiálu zhomogenizovať a odstrániť korózne produkty a iné nečistoty [10,11]. Medzi ďalšie mechanické úpravy povrchu sa zaraďuje tryskanie (tzv. "Shot Peening") materiálu. Tryskanie povrchu je potvrdeným a dobre zvládnutým typom mechanického spracovania povrchu,

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“…The above problems will hopefully be resolved with the rapid development of surface strengthening technology [4][5][6]. Surface nanocrystallization induced by severe plastic deformation (SPD) has been drawing more and more attention in recent years [7][8][9]. Current surface strengthening methods generally include shot peening (SP), ultrasonic shot peening (USP), surface mechanical attrition treatment (SMAT), cryogenic burnishing, etc.…”

Section: Introductionmentioning

confidence: 99%

Surface Characteristics and Fatigue Behavior of Gradient Nano-Structured Magnesium Alloy

Zhao

Zhang

Liu

2017

Metals

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High-frequency impacting and rolling was applied on AZ31B magnesium alloy to obtain a gradient nano-structured surface. Surface characteristics were experimentally investigated, and the nanocrystallization mechanism is discussed in detail. Results showed that the gradient nano-structure with the characteristics of work hardening, compressive residual stress and a smooth surface was induced on the treated surface. Grains on the top surface were generally refined to around 20 nm. Twins, dislocations and dynamic recrystallization dominated the grain refinement process. Fatigue strength of the treated specimens corresponding to 10 7 cycles was increased by 28.6% compared to that of the as-received specimens. The work hardened layer induced by high-frequency impacting and rolling is the major reason to improve fatigue life.

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Effect of severe shot peening on ultra-high-cycle fatigue of a low-alloy steel

Cited by 90 publications

References 24 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

Electrochemical Corrosion Characteristics of High Strength Low Alloy Domex 700 Steel After Mechanical Surface Treatment in Chloride Environment

Surface Characteristics and Fatigue Behavior of Gradient Nano-Structured Magnesium Alloy

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