High-cycle fatigue strength and small-crack growth behavior of ultrafine-grained copper with post-ECAP annealing

Goto, Masahiro; Teshima, Norihiro; Han, Sen; Euh, Kwangjun; Yakushiji, Terutoshi; Kim, S.S.; Lee, J.

doi:10.1016/j.engfracmech.2013.07.018

Cited by 19 publications

(10 citation statements)

References 53 publications

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“…According to Nisitani et al 8 and Goto et al, 9 the crack growth law in a small crack is expressed by Eq. (3) under some experimental conditions in the case of a surface crack.…”

Section: Variation In Crack Growth Behaviormentioning

confidence: 99%

Fatigue Life and Crack Growth Behavior in Annealed and Normalized 0.83% Carbon Steel

et al. 2015

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The variations of fatigue limit and fatigue life of a plain specimen of annealed and normalized 0.83% carbon steel were investigated. This material is used for cutting tools and the original microstructure includes a spherical microstructure. After heat treatment under some conditions, the microstructure changed to a lamellar microstructure. However, the fatigue lives of the plain specimens of this material showed almost the same tendency even after heat treatment under some conditions. In those cases, the initial crack length in the fatigue process is related to the size of the crystal structure and related to the distribution of ferrite. In the present study, the relationship between the distribution of hardness and the fatigue limit was investigated. Also, it was discussed that the fatigue limit of heat-treated 0.83% carbon steel could be evaluated by a relationship in which the parameters are the hardness and initial crack length. Finally, the tendencies of fatigue life of heat-treated 0.83% carbon steel were discussed based on the observations of crack growth behavior.

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“…According to Nisitani et al 8 and Goto et al, 9 the crack growth law in a small crack is expressed by Eq. (3) under some experimental conditions in the case of a surface crack.…”

Section: Variation In Crack Growth Behaviormentioning

confidence: 99%

Fatigue Life and Crack Growth Behavior in Annealed and Normalized 0.83% Carbon Steel

et al. 2015

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“…The studies of ultra-fine grained materials produced by ECAP [1], HPT [2], ARB [3], Warm tempforming [4], HCR [5], etc., are actively being advanced. An austenitic stainless steel, which has a grain size less than 2 µm, has been commercialized since 2013 [6].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Properties of Ultra-Fine Grain Austenitic Stainless Steel and the Effect of Hydrogen

et al. 2018

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Abstract. The fatigue properties of ultra-fine grain austenitic steel (UFG16-10), which has a 1 µm average grain size, were studied as part of the project aimed at the development of high-strength low-cost stainless steels for hydrogen service. The fatigue properties of the UFG16-10 were compared with that of a coarse grain material with the same chemical composition (CG16-10) and two kinds of commercial steels, JIS SUS316 and JIS SUH660. The fatigue strength of the UFG16-10 was 2.8 times higher than that of the CG16-10. The effect of hydrogen on the fatigue limit of the UFG16-10 was not significant. However, the fatigue life of the UFG16-10 was reduced by hydrogen in the short life regime. In the fatigue crack growth test, the UFG16-10 showed a good crack growth resistance that was equivalent to that of the SUH660 and significantly higher than that of the SUS316. However, the crack growth rate was significantly accelerated by hydrogen. The cause of the hydrogen-assisted fatigue crack growth of the UFG16-10 was transformation of the microstructure at the crack tip from austenite to strain-induced martensite. This was also the cause of the reduced fatigue life of the hydrogen-charged UFG16-10.

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“…4 To manufacture industrial parts out of UFG materials, applying post processes such as annealing, welding and machining methods are inevitable. Although many researchers have studied on the annealing and welding of the UFG materials, [6][7][8][9] machining of the UFG materials has been seldom considered. Electrical discharge machining (EDM) is a very suitable method for precise machining of hard and difficult-to-cut materials.…”

Section: Introductionmentioning

confidence: 99%

A study of stored energy in ultra-fined grained aluminum machined by electrical discharge machining

Mahdieh

Mahdavinejad

2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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Due to light weight and high strength, industrial applications of ultra-fined grain materials are becoming prevalent. Ultra-fined grain materials are produced by severe plastic deformation techniques such as equal channel angular pressing, which impose large strains on ultra-fined grain microstructure, resulting in accumulation of the lattice defects and dislocations and consequently increasing the stored energy. Due to high stored energy of ultra-fined grain materials, they are thermodynamically unstable and prone to microstructural evolutions. In order to manufacture industrials parts, applying machining methods such as electrical discharge machining is necessary. Electrical discharge machining is a thermo-electrical process that erodes the surface of the workpiece by high temperature sparks. The surface of the workpiece is melted and then suddenly quenched into dielectric, and eventually a very hard and brittle layer, known as recast layer, is formed. The recast layer and heat-affected zone are the source of microstructural changes that affect the special properties of the ultra-fined grain materials and their stored energy. In this study, the bulk and local stored energy of electrical discharge machined ultra-fined grain aluminum samples are measured via differential scanning calorimetry technique and micro-hardness test. In the following, the effects of the electrical discharge machining process on ultra-fined grain aluminum are investigated. The results show that electrical discharge machining process alters the stored energy of the ultra-fined grain materials.

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High-cycle fatigue strength and small-crack growth behavior of ultrafine-grained copper with post-ECAP annealing

Cited by 19 publications

References 53 publications

Fatigue Life and Crack Growth Behavior in Annealed and Normalized 0.83% Carbon Steel

Fatigue Life and Crack Growth Behavior in Annealed and Normalized 0.83% Carbon Steel

Fatigue Properties of Ultra-Fine Grain Austenitic Stainless Steel and the Effect of Hydrogen

A study of stored energy in ultra-fined grained aluminum machined by electrical discharge machining

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