Correlation of microstructure with mechanical properties and fracture behavior of A356-T6 aluminum alloy fabricated by expendable pattern shell casting with vacuum and low-pressure, gravity casting and lost foam casting

Jiang, Wenming; Zhao, Fan; Liu, Dejun; Liao, Defeng; Dong, Xiaojuan; Zong, Ximei

doi:10.1016/j.msea.2012.09.084

Cited by 93 publications

(29 citation statements)

References 24 publications

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“…The complicated and thin-walled aluminum alloy precision castings are widely used in the aircraft and automotive industries due to their excellent castability, weldability, corrosion resistance, and high strength-to-weight ratio [1][2][3][4][5]. The expendable pattern shell casting process is a compound precision casting technology and suitable for producing complicated and thin-walled aluminum alloy precision castings [6][7][8], which combines the foam pattern preparation of the lost foam casting (LFC) and thin shell precision fabrication of the investment casting.…”

Section: Introductionmentioning

confidence: 99%

Effects of vibration frequency on microstructure, mechanical properties, and fracture behavior of A356 aluminum alloy obtained by expendable pattern shell casting

Jiang

Wang

et al. 2015

Int J Adv Manuf Technol

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A simple, economic, and effective mechanical vibration method was introduced into the solidification process of A356 aluminum alloy during the expendable pattern shell casting process, and the effects of vibration frequency on microstructure, mechanical properties, and fracture behavior of the A356 alloy were investigated. Obtained results showed that the sizes and morphologies of α-Al primary phase and eutectic silicon particles were significantly improved by the mechanical vibration, and the mechanical properties and density of the A356 alloy greatly increased. With increasing vibration frequency, the grain size and secondary dendrite arm spacing (SDAS) continuously decreased, and the shape factor increased, and the mechanical properties and density of the A356 alloy gradually increased. With a vibration frequency of 100 Hz, the grain size and SDAS decreased by 32 and 19 %, respectively, and the shape factor increased by 262 %, and the average length, width, and aspect ratio of the silicon particles decreased by 45, 6, and 42 %, respectively, compared to that of the sample without vibration. Meanwhile, the tensile strength, yield strength, elongation, and hardness of the A356 alloy sample were, respectively, 35, 42, 57, and 28 % higher than those of the sample without vibration. In addition, the mechanical vibration changed the fractograph of the A356 alloy from a clear brittle fracture nature of the alloy without vibration to an obvious dimple fracture nature, and with the increase of vibration frequency, the dimples were very deep and well distributed with a high density.

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Section: Introductionmentioning

confidence: 99%

Effects of vibration frequency on microstructure, mechanical properties, and fracture behavior of A356 aluminum alloy obtained by expendable pattern shell casting

Jiang

Wang

et al. 2015

Int J Adv Manuf Technol

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“…In the present investigation of sand mould castings, larger Secondary Dendrite Arm Spacing (SDAS) and elongated eutectic silicon particles were observed. Generally elongated eutectic silicon particles fracture more frequently than the spherical silicon particles since they are the main sources of stress concentration [22]. The micrograph ( figure 12 (a)) also shows the areas of broken Fe-rich intermetallic compounds, labeled as 'B'.…”

Section: Compression and Tensile Propertiesmentioning

confidence: 99%

Microstructure, SDAS and Mechanical Properties of A356 alloy Castings Made in Sand and Granulated Blast Furnace Slag Moulds

Jinugu

Inampudi

2017

Archives of Foundry Engineering

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Investigations were carried out to ensure the granulated blast furnace (GBF) slag as an alternative mould material in foundry industry by assessing the cast products structure property correlations. Sodium silicate-CO2 process was adopted for preparing the moulds. Three types of moulds were made with slag, silica sand individually and combination of these two with 10% sodium silicate and 20 seconds CO2 gassing time. A356 alloy castings were performed on these newly developed slag moulds. The cast products were investigated for its metallography and mechanical properties. Results reveal that cast products with good surface finish and without any defects were produced. Faster heat transfers in slag moulds enabled the cast products with fine and refined grain structured; and also, lower Secondary Dendrite Arm Spacing (SDAS) values were observed than sand mould. Slag mould casting shows improved mechanical properties like hardness, compression, tensile and impact strength compared to sand mould castings. Two types of tensile fracture modes, namely cleavage pattern with flat surfaces representing Al−Si eutectic zone and the areas of broken Fe-rich intermetallic compounds which appear as flower-like morphology was observed in sand mould castings. In contrast, GBF slag mould castings exhibit majority in dimple fracture morphology with traces of cleavage fracture. Charpy impact fractured surfaces of sand mould castings shows both transgranular and intergranular fracture modes. Only intergranular fracture mode was noticed in both GBF slag and mixed mould castings.

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“…특히, 최근에는 독일을 중심으로 자동차용 알루미늄 주조부품을 제 조하는데 소실모형주조공정을 적용하게 되면서 국내에서도 이 에 대한 연구개발의 필요성이 높아지고 있는 상황이다. 주조 용 알루미늄합금을 소실모형주조공정으로 제조하는 경우 주조 제품의 기계적 성질은 주조 미세조직, 주입온도, 모래의 종류 등 여러 변수들의 영향을 받으며, 또한 다른 주조공정에 비 해 단점인 기공의 발생도 이러한 변수들과 밀접하게 연관되 어 있는 것으로 보고되어 있다 [2][3][4][5][6]. 소실모형주조의 특성상 기공이 두꺼운 제품부위에 쉽게 발생할 수 있어 실제 기계적 성질에 미치는 변수의 영향을 명확하게 파악하기 어려운데, 예를 들어 Sr을 사용한 Al-Si계 합금의 개량화처리를 한 경 우 공정 Si의 형상 개선으로 인해 기계적 성질이 향상될 수 있는 반면에 두꺼운 부위에서는 기공형성이 많아지면 심각한 특성저하가 유발된다 [7].…”

Section: 서 론unclassified

Mechanical Properties and Mold Filling Capability of Al-Si-Mg Casting Alloy Fabricated by Lost Foam Casting Process

Kim¹,

Ha²,

Choe³

2016

Journal of Korea Foundry Society

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The lost foam casting process was used to fabricate Al-Si-Mg cast specimens, and the effects of the chemical composition and process variables on the tensile properties and the mold filling ability were investigated. Some porosity formation was observed in thick sections of the casting and better tensile properties were obtained for thin sections, presumably because of their lower porosity and the higher cooling rate. Tensile properties were not clearly enhanced by grain refining treatment with Ti; however, the elongation was significantly improved by Sr modification of the Al-Si-Mg alloy. The mold filling distance was generally proportional to the pouring temperature of the melt, and the distance was also increased by the addition of Ti.

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Correlation of microstructure with mechanical properties and fracture behavior of A356-T6 aluminum alloy fabricated by expendable pattern shell casting with vacuum and low-pressure, gravity casting and lost foam casting

Cited by 93 publications

References 24 publications

Effects of vibration frequency on microstructure, mechanical properties, and fracture behavior of A356 aluminum alloy obtained by expendable pattern shell casting

Effects of vibration frequency on microstructure, mechanical properties, and fracture behavior of A356 aluminum alloy obtained by expendable pattern shell casting

Microstructure, SDAS and Mechanical Properties of A356 alloy Castings Made in Sand and Granulated Blast Furnace Slag Moulds

Mechanical Properties and Mold Filling Capability of Al-Si-Mg Casting Alloy Fabricated by Lost Foam Casting Process

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