Effect of Super-gravity Field on Grain Refinement and Tensile Properties of Cu–Sn Alloys

Yang, Yunfeng; Song, Bo; Cheng, Junsheng; Song, Gaoyang; Yang, Zhou; Cai, Zeyun

doi:10.2355/isijinternational.isijint-2017-233

Cited by 24 publications

(21 citation statements)

References 48 publications

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“…When R decreases to 0.152 m, the coefficient of supergravity decreases to 42, and SDAS and the average grain sizes reach their own maximum values which are 92 μm and 55 μm, respectively. This illustrates that the increase in the supergravity coefficient is beneficial to the refinement of solidification structure, which is consistent with the opinion of Yang et al When in supergravity fields of G=100, 300, and 600, the average grain sizes of as-cast Cu-11wt%Sn are 0.35 μm, 0.173 μm, and 0.074 μm [13].…”

Section: Macro-and Micro-structures Of As-cast H13 Samples In Supergrsupporting

confidence: 90%

“…In other words, the refinement of α-Al at the up area is worse than that at the bottom area [12]. This phenomenon also appeared in the supergravity samples of Cu-Sn alloys [13].…”

Section: Introductionmentioning

confidence: 87%

“…Based on these refinement mechanisms, researchers proposed the improvement measures of increasing the supergravity coefficient and changing the stage of applying supergravity. Compared with the sample before improvement, the solidification structure has a certain degree of refinement, but the solidification structure at up area still cannot be effectively refined, which accounts for about a quarter of the sample [11][12][13]. Due that super-gravity technology was limited by the experimental apparatus, these researches related to structure refinement in supergravity field are mainly conducted in laboratory-scale experiments, and the obtained samples are all less than 200 g. If the super-gravity refinement method in literatures is applied to the industrial-grade steel ingots above 30 kg, the refining effect at the upper area of the ingot will be even worse.…”

Section: Introductionmentioning

confidence: 99%

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Refinement on the Solidification Structure of H13 tool steel under Multi-Rotational Speeds Super-Gravity Field

Li¹,

Qin²,

Xi³

et al. 2020

Preprint

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In this paper, the effect of multi-rotational speeds super-gravity field on the grain refinement and tensile properties of as-cast H13 steel were investigated systematically. The experimental results revealed that the as-cast grains of H13 steel can be significantly refined in multi-rotational speeds supergravity field. In conventional supergravity field, with the decrease of rotational radius, the secondary dendrite average spacing (SDAS) and the austenite grain average size (AGAS) increase, and the maximum values of SDAS and AGAS are 90 µm and 55 µm, respectively. while in multi-speeds supergravity fields, at the range of increasing rotational speeds, SDAS and AGAS decrease as the rotational radius decreases. In three-rotational speeds supergravity field, the maximum values of SDAS and AGAS are 80 µm and 50 µm. In five-rotational speeds supergravity field, the maximum values of SDAS and AGAS are reduced to 58 µm and 34 µm. Accordingly, both the tensile strength and the plasticity are enhanced with the increasing the number of rotational speeds in supergravity field, especially for the inner position of supergravity sample. The ultimate tensile strengths at outer, middle, and inner positions of H13 steel solidified in conventional supergravity field are 1445 MPa, 1378 MPa, and 1023 MPa, corresponding elongations of 2%, 1.5%, and 0.5%, while in the five-rotational speeds supergravity field, they are 1408 MPa, 1443 MPa, and 1453 MPa, corresponding elongations of 1.8%, 3.9%, and 2.2%. The mechanism for the grain refinement is that multi-speeds super-gravity can reduce the critical nucleation work of austenite, and the tangential force produced by changing the rotational speeds breaks dendrites at the solidification front, refining solidification structure.

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Section: Macro-and Micro-structures Of As-cast H13 Samples In Supergrsupporting

confidence: 90%

“…In other words, the refinement of α-Al at the up area is worse than that at the bottom area [12]. This phenomenon also appeared in the supergravity samples of Cu-Sn alloys [13].…”

Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Refinement on the Solidification Structure of H13 tool steel under Multi-Rotational Speeds Super-Gravity Field

Li¹,

Qin²,

Xi³

et al. 2020

Preprint

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show abstract

“…[20] In addition to the Al system, the significant refinement of Cu-11wt%Sn alloys has been investigated under super-gravity field with gravity coefficient ranged from 100 g to 600 g, leading to the significant enhancement of tensile strength and plasticity. [31] However, to the best of our understanding, the research about the influence of gravity coefficient, especially above 1000 g, on eutectic structure and mechanical behavior of Al-Si alloys is still limited.…”

Section: Doi: 101002/adem202000360mentioning

confidence: 99%

“…[15] Recent results have confirmed that the super-gravity field could enhance the multiplication of crystal nucleation, named as "crystal rain," which significantly enhanced the migration of crystal nuclei. [25,31] The convection could be enhanced under super-gravity field, leading to the reduction of composition difference in solid-liquid. The growth of eutectic Si could be retarded by limited composition difference of solid-liquid.…”

Section: Refining Of the Eutectic Simentioning

confidence: 99%

Toward Enhanced Strength and Ductility of Al–14.5Si Alloy via Solidification Under Super‐Gravity Field

et al. 2020

Adv Eng Mater

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Herein, a novel method to improve the mechanical properties of Al–14.5Si alloys via solidification under super‐gravity field is reported. The Al–14.5Si alloys are solidified under normal gravity (1 g) and various super‐gravity fields (1000 g, 2000 g, 3000 g, and 4000 g), respectively. The results indicate that the solidification under super‐gravity field leads to right shifting of eutectic point and significant refinement of the eutectic Si. The refining of eutectic Si has a tremendous influence on mechanical properties. The elongation and fracture toughness of the Al–14.5Si alloys, solidified under super‐gravity field of 3000 g, can reach up to ≈12.7% and ≈20.21 MPa, which are approximately tenfold and three times higher relative to those under normal gravity, respectively. The fracture mode of Al–14.5Si alloy is transformed from brittle fracture under normal gravity to ductile fracture under super‐gravity field.

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Hypergravity experiments on multiphase media evolution

Chen

Yao

Ling

et al. 2022

Sci. China Technol. Sci.

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Effect of Super-gravity Field on Grain Refinement and Tensile Properties of Cu–Sn Alloys

Cited by 24 publications

References 48 publications

Refinement on the Solidification Structure of H13 tool steel under Multi-Rotational Speeds Super-Gravity Field

Refinement on the Solidification Structure of H13 tool steel under Multi-Rotational Speeds Super-Gravity Field

Toward Enhanced Strength and Ductility of Al–14.5Si Alloy via Solidification Under Super‐Gravity Field

Hypergravity experiments on multiphase media evolution

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