Microstructure and material properties of an Al–Cu alloy provided by the Ohno continuous casting technique

Okayasu, Mitsuhiro; Takasu, Satoshi; Yoshie, Shigeki

doi:10.1016/j.jmatprotec.2010.04.012

Cited by 18 publications

(7 citation statements)

References 20 publications

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“…It was found that there is a linear relationship between s e and HV for the die cast Al alloys, which is s e 5 1?08 HV, 20 but the slope is apparently lower than that for the steels. Our samples of cast Al alloys produced by the OCC and GC processes 21,22 show the following relationship, s e 5 1?11 HV, which is close to that of the die cast aluminium alloys. Suzuki et al investigated the influence of the cooling rate on the fatigue properties of cast AC4CH alloys and reported that alloys with fine porosities and tiny microstructures were created by a high cooling rate.…”

Section: Resultssupporting

confidence: 72%

“…The tensile strength and material ductility of the OCC-Al-Cu 33 is increased compared to the same material produced by a conventional gravity casting process. 10,11 A similar examination was carried out on the Al-Si 13 -Ni 1?4 -Mg 1?4 -Cu 1 aluminium alloy (AC8A), and this showed that the tensile strength and material ductility of the OCC-AC8A samples are about twice those of the same aluminium alloy produced by conventional gravity casting. The high tensile strength of the OCC-AC8A sample is affected mainly by tiny spherical a-Al grains and solid solution strengthening due to the high cooling rate.…”

Section: Introductionmentioning

confidence: 94%

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Mechanical properties of AC4CH alloys produced by heated mould continuous casting process

Okayasu

Takeuchi

Ohkura

et al. 2013

International Journal of Cast Metals Research

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This paper reports an investigation of the mechanical properties of cast aluminium AC4CH alloys produced by a unique casting method known as the heated mould continuous casting (OCC) process. The tensile and fatigue strengths and material ductility of the OCC samples are much higher than that for the same alloy produced by conventional gravity casting. The high tensile and high fatigue strengths of the OCC samples are reflected by the presence of tiny round a-Al grains, and the high ductility of OCC is a result of the regularly organized crystal orientation.

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Section: Resultssupporting

confidence: 72%

Section: Introductionmentioning

confidence: 94%

Mechanical properties of AC4CH alloys produced by heated mould continuous casting process

Okayasu

Takeuchi

Ohkura

et al. 2013

International Journal of Cast Metals Research

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“…to quantitatively interpret the fatigue strength of heated(20)-MS-h after hydrogen charging [20]. The formulas obtained are indicated on the S a -N f curves (Fig.…”

Section: Fatigue Propertiesmentioning

confidence: 99%

Hydrogen embrittlement properties of several stainless steels

Okayasu,

Matsuura

2023

Preprint

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The hydrogen embrittlement (HE) characteristics of various stainless steels were investigated. In this study, as-received, heated (1100°C, 15 h), and cold-rolled (30% strain) γ-austenite (AS), α-ferrite (FS), α′-martensite (MS), and γ–α duplex (DS) stainless steels were employed. For as-received stainless steels, severe HE occurred for DS and MS with static tensile loading, while no clear and weak HE was observed for AS and FS, respectively. This could be attributed to the different amounts of hydrogen diffusivity in the stainless steel. A large amount of hydrogen penetrated to (i) lattice vacancy with low atomic density for body-centered cubic FS, DS, and MS, compared to that for face-centered cubic (AS); (ii) the phase boundary between γ-austenite and α-ferrite for DS; and (iii) the boundary between the Cr base precipitate and the martensite matrix for MS. HE also occurred strongly for heated-DS owing to the grain growth, i.e., a high hydrogen concentration in grain and phase boundaries. Although no clear HE was detected in as-received AS with static loading, HE occurred in cold-rolled AS, where hydrogen penetrated lattice vacancies and α′-martensite formed through strain-induced martensite. Owing to strain-induced martensite created during cyclic loading, HE was detected even for as-received AS, which is dissimilar to the result of the tensile test. Details of HE characteristics of the strainless steels were examined using the four stainless steels with different microstructures, diferent strain level and oxide layer. Moreover, those were investigated under different loading conditions, such as constant, static, and cyclic loading.

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“…However, cast aluminium alloys are not always adequate as engineering alloys as they lack mechanical strength. To improve the mechanical properties of cast aluminium alloys, various casting technologies have been proposed, such as squeezed casting [1], melt drag twin-roll casting [2], semisolid rheo-casting [3], and heated mould continuous casting (HMC) [4]. Commercial cast aluminium alloys (ADC12) synthetised via the HMC process exhibit good tensile strength properties; specifically, which is more than 1.5 times higher than that of ADC12 alloys obtained via the conventional die casting process [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon nanotubes on the mechanical properties of cast Al–Si–Cu alloys

Okayasu

Hasanah

2022

Materials Science and Technology

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To enhance the mechanical properties of cast Al–Si–Cu alloys (ADC12), 0.3% of carbon nanotubes (CNTs) was added. The cast ADC12–0.3%CNT samples were synthesised via heated mould continuous casting for the creation of fine grains, and the artificial aging process was conducted at 173°C for 13 h to obtain precipitation hardening. The reinforcement and refinement of eutectic Si and precipitates (Al2Cu and Mg2Si) were achieved by adding CNTs, which leads to a high tensile strength of about 450 MPa and a relatively high ductility of about 10%. The obtained tensile strength and 0.2% proof stress are more than twice as high as those of the conventional cast ADC12 alloy. The refinement of the microstructures could be due to the interruption of their growth caused by the CNTs.

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Microstructure and material properties of an Al–Cu alloy provided by the Ohno continuous casting technique

Cited by 18 publications

References 20 publications

Mechanical properties of AC4CH alloys produced by heated mould continuous casting process

Mechanical properties of AC4CH alloys produced by heated mould continuous casting process

Hydrogen embrittlement properties of several stainless steels

Effect of carbon nanotubes on the mechanical properties of cast Al–Si–Cu alloys

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