Effect of ARB Processing on Fatigue Crack Closure in Commercially Pure Titanium

Kitahara, Hiromoto; Matsushita, Sho; Tsushida, Masayuki; Ando, Shinji

doi:10.2320/matertrans.m2012352

Cited by 7 publications

(4 citation statements)

References 12 publications

(6 reference statements)

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“…However, the RSA450 sample exhibits a large fatigue ratio (0.56) at a high tensile strength of 870 MPa. One can see that the HCF behavior of the RSA450 sample differs significantly from that of conventional CG and UFG CP-Ti [22,23,24,25,26,27,28,29,30,31,32,33,34,35,39], and is close to that of the Ti-6Al-4V alloy.…”

Section: Resultsmentioning

confidence: 84%

“…The highest HCF limit of 460 MPa was reported in UFG CP-Ti (grade 2), produced by ECAP [22,23,24]. It was observed that the fatigue crack initiation was significantly delayed in the transverse direction due to the strong crystallographic texture of UFG Ti fabricated by accumulative roll bonding (ARB), while the crack propagation behavior was not obviously affected [25,26,27]. Although these studies revealed some interesting fatigue behaviors of UFG CP-Ti, investigations into the fatigue properties of UFG CP-Ti are still limited.…”

Section: Introductionmentioning

confidence: 99%

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Promising Tensile and Fatigue Properties of Commercially Pure Titanium Processed by Rotary Swaging and Annealing Treatment

Wang

Huang

et al. 2018

Materials

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The effect of the grain refinement and texture on tensile and fatigue properties in commercially pure titanium (grade 2) processed by rotary swaging (RS) and an annealing treatment is investigated. The as-processed sample consists of band-like grains on the longitudinal section and equiaxed grains on the transversal section and revealed an obvious <10-10> fiber texture with respect to the rod axis. Through this technique, a sample with a high tensile strength of 870 MPa, a high uniform elongation of 8.5%, and a high fatigue limit of 490 MPa can be achieved, and the tensile and fatigue properties are almost the same as those of a conventional Ti-6Al-4V alloy. The enhanced mechanical properties and plastic deformation mechanism are discussed in terms of the observed ultrafine-grained microstructure and strong fiber texture.

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Section: Resultsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Promising Tensile and Fatigue Properties of Commercially Pure Titanium Processed by Rotary Swaging and Annealing Treatment

Wang

Huang

et al. 2018

Materials

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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%

412 Fatigue properties of ultra-fine grain austenitic stainless steel and effect of hydrogen

Mori

Kubota

Macadre

2014

The Proceedings of Conference of Kyushu Branch

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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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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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Effect of ARB Processing on Fatigue Crack Closure in Commercially Pure Titanium

Cited by 7 publications

References 12 publications

Promising Tensile and Fatigue Properties of Commercially Pure Titanium Processed by Rotary Swaging and Annealing Treatment

Promising Tensile and Fatigue Properties of Commercially Pure Titanium Processed by Rotary Swaging and Annealing Treatment

412 Fatigue properties of ultra-fine grain austenitic stainless steel and effect of hydrogen

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

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