Effect of Runner Distance on Microstructure and Properties of Semi-Solid Squeeze Casting CuSn10P1 Alloy

It is easy to form reverse segregation and shrinkage porosity defects during the solidification of CuSn10P1 alloy, which leads to the poor properties and limits its application in high strength and toughness parts. In this paper, semi-solid CuSn10P1 alloy slurry was prepared by enclosed cooling slope channel (for short ECSC). The effect of runner distance on microstructure and properties by liquid squeeze casting and semi-solid squeeze casting was studied. The results showed that the microstructure of semi-solid squeeze casting is finer than that of liquid squeeze casting, and the shrinkage defects are improved. The solid fraction with 65 mm runner is lower than that without runner in liquid squeeze casting and semi-solid squeeze casting due to the retention effect of solid phase in semi-solid slurry flow, but the properties with 65 mm runner is better than that without runner. The ultimate tensile strength, yield strength and elongation of semi-solid squeeze casting CuSn10P1 alloy with 65 mm runner distance reached 466.5 MPa, 273.6 MPa and 13.4%, which were improved by 26%, 19% and 97%, respectively, as compared to that of liquid squeeze casting.

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Microstructure and Properties of Semi-Solid CuSn10P1 Alloy under Different Filling Velocity by Squeeze Casting

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.285.264 ◽

2019 ◽

Vol 285 ◽

pp. 264-270

Author(s):

Yong Kun Li ◽

Rong Feng Zhou ◽

Lu Li ◽

Han Xiao ◽

Ye Hua Jiang

Keyword(s):

Tensile Strength ◽

Ultimate Tensile Strength ◽

Squeeze Casting ◽

Microstructure And Properties ◽

Cooling Slope ◽

Semi Solid ◽

Slope Channel

Semi-solid CuSn10P1 alloy slurry was fabricated by a novel enclosed cooling slope channel (for short ECSC). The effect of filling velocity on microstructure and properties by squeeze casting was studied. The results showed that primary α-Cu phase gradually formed from dendrites evolved into worm-like or equiaxed crystals by ECSC. As the filling velocity increases, the ultimate tensile strengths and elongations of the shaft sleeve increase first and then decrease. The ultimate tensile strength and elongation of semi-solid squeeze casting CuSn10P1 alloy reached a maximum of 417.6MPa and 12.6% when the forming pressure is 100MPa and filling velocity is 21mm/s, which were improved by 22% and 93%, respectively, as compared to that of liquid squeeze casting.

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Correlation between Microstructure and Properties of Semi-Solid Products

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.285.12 ◽

2019 ◽

Vol 285 ◽

pp. 12-23 ◽

Cited By ~ 2

Author(s):

Annalisa Pola

Keyword(s):

Mechanical Properties ◽

Fatigue Wear ◽

Microstructure And Properties ◽

Tensile Fatigue ◽

Wear And Corrosion ◽

Semi Solid ◽

Wear And Corrosion Resistance ◽

Permanent Mold Castings ◽

The Relationship ◽

Better Than

Since the very first production trials, it was evident that semi-solid components exhibit excellent mechanical properties, comparable to those of forged material and, in any case, better than permanent mold castings. Over the years, these findings have been confirmed by many authors. Most of the papers available in scientific literature deals with the demonstration of this improvement, especially in order to show the reliability of new and alternative production routes. On the contrary, only some studies focus their attention on the relationship between enhanced mechanical properties and the microstructure. However, it is demonstrated that the increased performance of semi-solid components is not only due to the absence of porosity, but there is a clear relationship between microstructure and properties. This paper reports about the state of knowledge in this subject, in particular for what concerns tensile, fatigue, wear and corrosion resistance.

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Effect of heat treatment on microstructure and properties of semi-solid squeeze casting AZ91D

China Foundry ◽

10.1007/s41230-020-9103-9 ◽

2020 ◽

Vol 17 (3) ◽

pp. 219-226 ◽

Cited By ~ 1

Author(s):

Zhi-yong You ◽

Ao-xue Jiang ◽

Zhuang-zheng Duan ◽

Gang-ping Qiao ◽

Jing-lei Gao ◽

...

Keyword(s):

Heat Treatment ◽

Squeeze Casting ◽

Microstructure And Properties ◽

Semi Solid

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Simulation Fluidity Test for Semisolid Squeeze Casting

MATEC Web of Conferences ◽

10.1051/matecconf/202032802006 ◽

2020 ◽

Vol 328 ◽

pp. 02006

Author(s):

Richard Pastirčák ◽

Denis Martinec

Keyword(s):

Squeeze Casting ◽

Solid Phase ◽

Mold Temperature ◽

Simulation Software ◽

Operating Pressure ◽

Piston Speed ◽

Solid Phase Content ◽

Semi Solid ◽

Test Casting ◽

The Individual

The paper deals with semi solid squeeze casting technology. Fluidity tests were designed for the selected technology. The shape of the test casting was designed in the shape of test bars with different thicknesses and also in the shape of a stepped casting. The thickness of the individual elements was chosen on the basis of a selected / preferred numbers R10 EN STN 17. As a result, the thickness of the elements was 2.0, 2.5, 3.15, 4.0, 5.0 and 6.3 mm. Designed fluidity tests were verified by using ProCast simulation software. The selected process parameters were: operating pressure 80 MPa, mold temperature 200 °C, piston speed 30 mm.s-1. The experimental material was an AlSi7Mg0.3 alloy with a different solid phase content. The initial solid amount were 50, 55 and 60 %. The effect of solidus and liquidus, temperature distribution and pressure was monitored during the evaluation of fluidity.

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Microstructure and Properties of Semi-solid ZCuSn10P1 Alloy Processed with an Enclosed Cooling Slope Channel

Metals ◽

10.3390/met8040275 ◽

2018 ◽

Vol 8 (4) ◽

pp. 275 ◽

Cited By ~ 1

Author(s):

Yongkun Li ◽

Rongfeng Zhou ◽

Lu Li ◽

Han Xiao ◽

Yehua Jiang

Keyword(s):

Microstructure And Properties ◽

Cooling Slope ◽

Semi Solid ◽

Slope Channel

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Effects of Process Parameters on Shrinkage Porosity in 357 Semi-Solid Die Casting Parts

Materials Science Forum ◽

10.4028/www.scientific.net/msf.993.166 ◽

2020 ◽

Vol 993 ◽

pp. 166-171

Author(s):

Zi Kang Liu ◽

Min Luo ◽

Da Quan Li ◽

Long Fei Li ◽

Jian Feng

Keyword(s):

Process Parameters ◽

Die Casting ◽

Casting Process ◽

Shrinkage Porosity ◽

Die Design ◽

Intensification Pressure ◽

Porosity Defects ◽

Die Temperature ◽

Die Casting Process ◽

Semi Solid

The shrinkage porosity that was caused by the insufficient feeding during solidification, was a common defect in the semi-solid die casting process. This defect decreased significantly the mechanical properties of the casting. In order to avoid the shrinkage porosity in casting, the die design, slug preparation and die casting process were carefully considered. In this study, a designed mold was used to make the sequential solidification of the slug. The process parameters, including intensification pressure, die temperature and biscuit thickness of the casting, were studied to show their influence on shrinkage porosity defects. The experimental results show that the high intensification pressure, high die temperature and long biscuit can be beneficial to obtain castings with no shrinkage porosity.

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The clinical relevance of isolated lupus anticoagulant positivity in patients with thrombotic antiphospholipid syndrome

Thrombosis and Haemostasis ◽

10.1055/a-1344-4271 ◽

2020 ◽

Author(s):

Dong-mei Yin ◽

Philip de Groot ◽

Marisa Ninivaggi ◽

Katrien M.J. Devreese ◽

Bas de Laat

Keyword(s):

Antiphospholipid Syndrome ◽

Clinical Relevance ◽

Antiphospholipid Antibodies ◽

Odds Ratio ◽

Lupus Anticoagulant ◽

Solid Phase ◽

Control Group ◽

Domain I ◽

Normal Controls ◽

Better Than

Background: Patients positive for three types of antiphospholipid antibodies (aPLs) (triple positivity) have been identified at a high risk for thrombotic events. However, the clinical significance of isolated lupus anticoagulant (LAC) positivity is debated. Objectives: To investigate the clinical relevance of isolated LAC. Patients/Methods 456 patients were enrolled in this study; 66 antiphospholipid syndrome patients and 390 control patients. The control group existed of autoimmune patients (n=91), patients with thrombosis but without aPLs (n=127) and normal controls (n=172). The criteria LAC, anti-cardiolipin (anti-CL) and anti-beta2glycoprotein I (anti-β2GPI) IgG and IgM and the non-criteria IgA anti-CL and anti-β2GPI, anti-domain I (anti-DI) of β2GPI IgG and anti-phosphatidylserine/prothrombin (anti-PS/PT) IgG and IgM were detected according to the ISTH guidelines for solid phase assays. Results: 70 patients were positive for LAC, of which 44 were negative for both anti-β2GPI and anti-CL. We found that isolated LAC proved to be strongly associated with vascular thrombosis (Odds ratio (OR) (95% CI) 7.3 (3.3-16.1)), even better than triple positive samples (OR 4.3 (1.6-12.2)). The titers of the anti-PS/PT IgG and IgM were significantly higher in triple positivity samples compared to samples with isolated LAC positivity. The majority of single LAC positives were anti-PS/PT negative. We observed that LAC positivity was weaker in isolated LAC positive patients compared to LAC activity in triple positive patients. Conclusions: Isolated LAC was highly associated with thrombosis. The presence of anti-PS/PT could not explain LAC positivity in isolated LAC. Isolated LAC showed a weaker LAC activity compared to triple positive patients.

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Comprehensive Analysis of the Microstructure and Mechanical Properties of Friction-Stir-Welded Low-Carbon High-Strength Steels with Tensile Strengths Ranging from 590 MPa to 1.5 GPa

Applied Sciences ◽

10.3390/app11125728 ◽

2021 ◽

Vol 11 (12) ◽

pp. 5728

Author(s):

HyeonJeong You ◽

Minjung Kang ◽

Sung Yi ◽

Soongkeun Hyun ◽

Cheolhee Kim

Keyword(s):

Mechanical Properties ◽

Tensile Test ◽

Joint Strength ◽

Solid Phase ◽

Welding Process ◽

High Strength Steels ◽

High Strength ◽

Low Carbon ◽

Friction Stir ◽

Welding Processes

High-strength steels are being increasingly employed in the automotive industry, requiring efficient welding processes. This study analyzed the materials and mechanical properties of high-strength automotive steels with strengths ranging from 590 MPa to 1500 MPa, subjected to friction stir welding (FSW), which is a solid-phase welding process. The high-strength steels were hardened by a high fraction of martensite, and the welds were composed of a recrystallized zone (RZ), a partially recrystallized zone (PRZ), a tempered zone (TZ), and an unaffected base metal (BM). The RZ exhibited a higher hardness than the BM and was fully martensitic when the BM strength was 980 MPa or higher. When the BM strength was 780 MPa or higher, the PRZ and TZ softened owing to tempered martensitic formation and were the fracture locations in the tensile test, whereas BM fracture occurred in the tensile test of the 590 MPa steel weld. The joint strength, determined by the hardness and width of the softened zone, increased and then saturated with an increase in the BM strength. From the results, we can conclude that the thermal history and size of the PRZ and TZ should be controlled to enhance the joint strength of automotive steels.

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