Effect of Heat Treatment on the Mechanical Properties of Investment Casting Turbo Charger Wheel using A356 Alloy

In this paper, the castings of A356 alloy were made by the rheo-squeeze casting with slurry-making from the process of LSPSF. Experiments were designed to study the influence of three parameters in rheo-squeeze casting process, such as injection speed, mould preheating temperature and injection pressure, on castings performance. The results show that high-quality castings were produced with the injection speed of 0.5m/s ,the mould preheating temperature of 240°C, the injection pressure of 50MPa. The mechanical properties, such as the yield strength, tensile strength and elongation of the castings with T6 heat treatment are 241 MPa, 328MPa and 11.6%, respectively.

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Evolution of Microstructure and Mechanical Properties of Semi-Solid Squeeze Cast A356.2 Aluminum Alloy during Heat Treatment

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.285.139 ◽

2019 ◽

Vol 285 ◽

pp. 139-145

Author(s):

Le Cheng ◽

Hong Xing Lu ◽

Qiang Zhu ◽

Xiang Kai Zhang ◽

Ai Di Shen ◽

...

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Squeeze Casting ◽

Low Cost ◽

A356 Alloy ◽

Microstructure And Mechanical Properties ◽

New Processing ◽

Semi Solid ◽

Evolution Of Microstructure ◽

Cast Condition

Semi-solid squeeze casting (SS-SC) is a new processing technology which combines semi-solid processing (SSP) and squeeze casting (SC). In this process, semi-solid slurry fills mold by using its rheological property and solidifies under high pressure. It has several advantages, such as stable filling, small heat impact to the mold, low cost, high density and excellent mechanical properties of castings, which receives more and more attention. The microstructure of castings provided by SS-SC is quite different from that of casting provided by conventional SC in as-cast condition, which leads to differences in the evolution of microstructure and mechanical properties in heat treatment process. In this study, A356.2 aluminum alloys castings were provided by both SS-SC and conventional SC respectively. The evolution of microstructure and mechanical properties of castings during heat treatment was investigated to obtain the best mechanical properties of semi-solid squeeze castings. Keywords:Microstructure, Mechanical properties, Heat treatment, A356 alloy, Semi-Solid Squeeze Casting

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Effect of the Spinning Deformation Processing on Microstructure and Mechanical Properties of A356 Wheels

Materials Science Forum ◽

10.4028/www.scientific.net/msf.850.526 ◽

2016 ◽

Vol 850 ◽

pp. 526-531

Author(s):

Mao Wen Liu ◽

Wen Long Xiao ◽

Cong Xu ◽

Hiroshi Yamagata ◽

Jiu Xin Chen ◽

...

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Tensile Properties ◽

A356 Alloy ◽

Deformation Processing ◽

Coarse Microstructure ◽

Deformation And Heat Treatment ◽

Electron Microscopes ◽

Scanning Electron Microscopes ◽

Porosity Percentage

The influences of spinning deformation and heat treatment on microstructure and tensile properties of A356 alloy at different cooling rates were investigated in this study by optical and scanning electron microscopes. The results indicated that spinning deformation enhanced the tensile properties of the alloy due to the reduction of Si size and porosity percentage, especially in the samples with coarse microstructure. Heat treatment increased the strength while decreased the ductility of the alloy because of the precipitation of brittle Mg2Si in Al matrix. It is suggested that the spinning deformation processing is an effective technique to produce A356 alloy wheels with high mechanical properties.

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Analysis of Microstructure and Mechanical Properties in As-Built/As-Cast and Heat-Treated Conditions for IN718 Alloy Obtained by Selective Laser Melting and Investment Casting Processes

Crystals ◽

10.3390/cryst11101196 ◽

2021 ◽

Vol 11 (10) ◽

pp. 1196

Author(s):

Juan Carlos Pereira ◽

Jon Aranzabe ◽

Mari Carmen Taboada ◽

Noelia Ruiz ◽

Pedro Pablo Rodriguez

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Investment Casting ◽

Dendritic Structure ◽

Heat Treatments ◽

Strengthening Mechanisms ◽

Standard Heat Treatment ◽

Homogeneous Microstructure ◽

Standard Heat ◽

Microstructure And Mechanical Properties

In this work, new customized heat treatments for selective laser melted (SLM) parts in IN718 alloy were analyzed. This was done through the evaluation of the mechanical properties and advanced characterization of the phases and microstructure obtained in as-built condition and after the application of standard and tailored heat treatments. The microstructure and mechanical properties were compared and discussed with results reported in the literature. Finally, strengthening mechanisms of IN718 alloy processed by SLM and its differences with mechanisms that occur in investment casting were analyzed. Both processes generate quite different microstructures, investment casting is composed mainly by a dendritic structure, and SLM is characterized by columnar and cellular structures with very thin cells. Due to the fine and homogeneous microstructure obtained from SLM processing and its specific strengthening mechanisms, it is not necessary to apply homogenization and solution stages as in standard heat treatment used for this type of alloy in casting or wrought. The pre-heating and process parameters selected, in combination with a direct stepped aging (at 720 °C/620 °C), provide the material with its best mechanical properties, which are superior to those obtained by standard heat treatment (AMS 5383F) applied to investment casting of IN718 alloy.

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