Investigation of the Relationships between Billet Reheating and Semi-Solid Die-Casting

2010 ◽  
Vol 97-101 ◽  
pp. 306-310 ◽  
Author(s):  
Xiang Lin Yin ◽  
Yi Tao Yang ◽  
Yu Peng Shao ◽  
Guang Jie Shao
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Aluminum Alloy ◽  
Die Casting ◽  
Surface Hardness ◽  
A356 Aluminum Alloy ◽  
Final Temperature ◽  
A356 Aluminum ◽  
Semi Solid ◽  
The Relationship

The non-dendritic of A356 aluminum alloy billet was reheated to meet the requirements of the semi-solid microstructure by three different kinds of power, achieving the same final temperature of 863K. Subsequently, under the same conditions of die-casting (thixoforming), the microstructure was observed, surface hardness and tensile properties were measured. Afterwards, quantitative analysis was made for the microstructure of the reheated semi-solid of billet and the thixoforming parts. The results showed that the larger induction reheating power of the billet, the smaller the grain size of its microstructure and the higher surface hardness and the better mechanical properties of its thixoforming sample. Finally, through studying on the relationship between the microstructure of the semi-solid billet of A356 aluminum alloy and the mechanical properties of the thixoforming sample, we primarily achieved the reverse design of microstructure.

Study on Microstructures and Mechanical Properties of Rheo-Die Casting Semi-Solid A356 Aluminum Alloy

2006 ◽  
Vol 116-117 ◽  
pp. 453-456 ◽  
Author(s):  
Yong Lin Kang ◽  
Yue Xu ◽  
Zhao Hui Wang
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Die Casting ◽  
A356 Alloy ◽  
Experimental Results ◽  
A356 Aluminum Alloy ◽  
Microstructures And Mechanical Properties ◽  
A356 Aluminum ◽  
Semi Solid

In this paper, with a newly self-developed rotating barrel rheomoulding machine(RBRM), microstructures and mechanical properties of rheo-die casting A356 alloy were studied. In order to clearly show the characteristic of rheo-die casting, liquid die casting and semi-solid casting were done too. The experimental results showed that microstructures of rheo-die casting were composed of solid grains, which were finer and rounder, and had fewer pores. In the three technologies, integrated mechanical properties of semi-solid rheo-die casting were the best.

Microstructure and Mechanical Properties of Semi-Solid Die-Cast A356 Aluminum Alloy

2016 ◽  
Vol 877 ◽  
pp. 39-44
Author(s):  
Si Min Lei ◽  
Li Gao ◽  
Yohei Harada ◽  
Shinji Kumai
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
A356 Aluminum Alloy ◽  
Microstructure And Mechanical Properties ◽  
Die Cast ◽  
Microstructural Evaluation ◽  
Cast Machine ◽  
A356 Aluminum ◽  
Semi Solid ◽  
The Relationship

The present work deals with the relationship between microstructure and mechanical properties of A356 aluminum alloy which was produced via thixocasting process under different casting conditions. Feedstock billets were heated to a target temperature to obtain a semi-solid slurry with the required solid fraction. Some billets were heated to a fully-melted condition. In order to obtain fine and spheroidized Al grains, some billets for the partially melting were compressed axially by 33% at a room temperature before heating. The completely-melted and partially-melted slurries were die-cast by using a die-cast machine, and hour glass-shaped rod-type tensile specimens and small-size plate-type tensile specimens were obtained. Small cubic specimens were also collected from the die-cast products for microstructural evaluation. They were polished, and etched by Weck’s reagent. The partially-melted specimen which was compressed before heating shows the spherical Al grains. But the grain of the strain-free partially-melted specimen exhibited complicated morphology. The fully-melted specimen shows the fine and dendrite structure.

Preparation and Rheo-Die Casting of Semi-Solid A356 Aluminum Alloy Slurry through a Serpentine Pouring Channel

2012 ◽  
Vol 192-193 ◽  
pp. 404-409 ◽  
Author(s):  
W.M. Mao ◽  
Z.Z. Chen ◽  
H.W. Liu ◽  
Y.G. Li
Keyword(s):  
Aluminum Alloy ◽  
Ultimate Strength ◽  
Die Casting ◽  
Good Method ◽  
A356 Aluminum Alloy ◽  
Forming Process ◽  
Die Cast ◽  
A356 Aluminum ◽  
Semi Solid ◽  
Die Castings

The semi-solid slurry of A356 aluminum alloy was prepared through a serpentine pouring channel, which is a new method proposed recently for semi-solid forming process, and the effect of pouring temperature and bend number in the channel on the slurry microstructure was investigated and the slurry was finally rheo-die cast. The results show that when the pouring temperatures are between 640oC and 680oC, the slurry of A356 aluminum alloy with spherical primary a-Al grains can be prepared under the given conditions. The more the bend numbers in the channel are, the better the slurry is, i.e. the primary a-Al grains are more spherical and finer. The results also show that the as-cast ultimate strength and elongation of the rheo-die castings can reach 250MPa and 8.613.2% respectively. After T6 heat treatment, the ultimate strength and elongation of the rheo-die castings can reach 320MPa and 8.011.3% respectively. The work undertaken demonstrates eventually that the serpentine pouring channel process is a good method for semi-solid rheo-die casting or rheo-forming of metallic materials, the process is simple and the slurry cost is not expensive.

Behavior of A356 Alloy in Semi-Solid State Produced by Mechanical Stirring

2011 ◽  
Vol 402 ◽  
pp. 331-336 ◽  
Author(s):  
Salman Nourouzi ◽  
Amin Kolahdooz ◽  
Mohammad Botkan
Keyword(s):  
Mechanical Properties ◽  
Die Casting ◽  
A356 Alloy ◽  
Mold Temperature ◽  
A356 Aluminum Alloy ◽  
Micro Structure ◽  
Mechanical Stirring ◽  
Aluminum Silicon Alloy ◽  
A356 Aluminum ◽  
Semi Solid

This investigation studied semi-solid (SSM) aluminum-silicon alloy produced by mechanical stirring. Aluminum alloys produced by this method, are widely used instead of conventional die casting and forging processes. In this research by using a mechanical stirrer slurry maker, the effects of stirring speed, the solid fraction percent and mold temperature are investigated on micro-structure and hardness of A356 aluminum alloy in semi-solid casting. By optimizing the forming parameters, dendrite microstructure changes to globular and mechanical properties improves. This is because of breaking and globularizing dendrites of primary α-AL phase. It is determined that stirring temperature of 608°C and stirring speed of 300 RPM leads to the uniform grains distribution and therefore arrives to better hardness for the produced billets.

Effect of Strontium on Microstructure and Mechanical Properties of Semi-Solid A356 Al Alloy

2014 ◽  
Vol 893 ◽  
pp. 353-356
Author(s):  
Atchara Sangchan ◽  
Thawatchai Plookphol ◽  
Jessada Wannasin ◽  
Sirikul Wisutmethangoon
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Ultimate Tensile Strength ◽  
Al Alloy ◽  
A356 Aluminum Alloy ◽  
Heat Treated ◽  
Eutectic Si ◽  
A356 Aluminum ◽  
Semi Solid

Effect of strontium (Sr) addition on the microstructure and the mechanical properties of semi-solid A356 aluminum alloy produced by GISS process were investigated in this study. Strontium addition resulted in both grain refinement and modification of eutectic Si. The maximum average ultimate tensile strength and elongation of 291.06 MPa and 17.31%, respectively, were obtained from the T6 heat-treated specimen containing 0.08wt%Sr. The excessive addition of strontium (0.2wt%Sr), however, seemed to deteriorate the mechanical properties of the alloy as a result of the Al2Si2Sr particle formation.

Microstructure Evolution and Mechanical Properties of Rheoformed YL112 Aluminum Alloy

2008 ◽  
Vol 141-143 ◽  
pp. 163-168 ◽  
Author(s):  
Xiang Jie Yang ◽  
Hong Min Guo
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Shape Factor ◽  
Die Casting ◽  
Equivalent Diameter ◽  
Uniform Microstructure ◽  
Casting Aluminum Alloy ◽  
Casting Aluminum ◽  
Semi Solid ◽  
Secondary Solidification

Rheo-die casting (RDC) based on LSPSF (low superheat pouring with a shear field) rheocasting process has been exploited. In case of secondary die casting aluminum alloy YL112, LSPSF allowed for preparation of sound semi-solid slurry in 15-20s that fully meet the production rate of HPDC, the primary α-Al exhibiting a mean equivalent diameter of 70 μm and shape factor of 0.93, without any entrapped eutectic. Compared to conventional HPDC, RDC improves microstructures in castings. Secondary solidification of semi-solid slurry takes place uniformly throughout the entire cavity, producing an extremely fine and uniform microstructure. The experimental results show the RDC 380 alloy has much improved integrity and mechanical properties, particularly elongation, and heat treatment can be used to enhance the mechanical properties.

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