Paper Title:
Analytical and Experimental Models of Porosity Formation of Duralumin Cast in Vacuum Casting System
  Abstract

Porosity in cast metals often leads to cracking of components due to stress concentration and leakage, and as the result, the castings need be repaired or rejected. Disharmony in casting process was resulting in porosity. Prediction of porosity in the casting is necessary as a step to avoid the waste products and reduce costs. But to ensure whether these predictions are accurate and precise, it is still necessary to validate the test trials and testing. This paper aims to provide early information when, where, and how large a defect occurs in particular foundry casting porosity on duralumin. The analytical study of porosity formation based analytic equilibrium wt% of element, the behavior of the thermodynamic, hydrodynamic, and rules of metallurgical on vacuum casting of duralumin. Experiments as a validation study are conducted by duralumin remelting on stainless-steel bowl in a vacuum casting furnace. Analytical simulation and experiments of the casting that has been vacuumed by melting 10 cmHg pressures higher than the pressure solidification, and duralumin melt is poured automatically into permanent mold carbon steel. In the study cast duralumin created five different thicknesses. Both these studies assume the addition of copper (2.5%, 3.0%, 3.5 %, 4.0%, and 4.5% Cu) and vacuum pressure (76, 50, 40, cmHg), as independent variables, while dependent variable in the studies is porosity characteristics, which includes morphology, number and dimensions of the porosity. Optical emission spectrometry test, Reynold's and Niyama numbers, Sievert's law, Archimedes' principle (Pycnometry and Straube-Pfeiffer tests), and Eichenauer equation are instruments which are used to determine the characterization of duralumin casting porosity. Duralumin ingots remelting process was performed by the control pressure (p1) and temperature (T1). Vacuuming process performed after the smelting room temperature reaches 600 °C. Once melted, it followed by duralumin into a permanent mold (p2, T2). As a control parameter is the height of pouring (7 cm), pour temperature and mold temperature respectively at 750 °C and 300 °C. The porosity characteristics studies of two models produce two types of porosity (gas and shrinkage), the quantity dimension and porosity, and distribution of porosity in the cast duralumin.

  Info
Periodical
Edited by
Bondan Tiara Sofyan
Pages
76-83
DOI
10.4028/www.scientific.net/AMR.277.76
Citation
W. Suprapto, B. Suharno, J. W. Soedarsono, D. Priadi, "Analytical and Experimental Models of Porosity Formation of Duralumin Cast in Vacuum Casting System", Advanced Materials Research, Vol. 277, pp. 76-83, 2011
Online since
July 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Hong Yan, Zhi Hu, Ti Shuan Suan
Abstract:The technology of computer numerical simulation on casting process is an important frontal field of material science and technology. The...
1041
Authors: Dun Ming Liao, Li Liang Chen, Jian Xin Zhou, Rui Xiang Liu
Abstract:The nonferrous alloy castings will be much demanded with the development of aerospace, light-weight weapons and automotive industry. Casting...
1113
Authors: Bai Yang Lou, Fang Li Liu, Kang Chun Luo
Chapter 1: Materials Science and Engineering
Abstract:The numerical simulations of mold filling and solidification process for the A380 aluminum alloy were done by the supposed mathematical...
254
Authors: Derya Dispinar, S. Akhtar, A. Nordmark, F. Syvertsen, M. Di Sabatino, L. Arnberg
Chapter 2: Forming in Melt or Near Melt Condition
Abstract:Gravity die casting (GDC) and low pressure die casting (LPDC) methods were used to compare the mechanical properties and porosity...
283
Authors: Yong Huang, Yue Dong, Xiao Ming Du
Chapter 2: Manufacturing and Design Science
Abstract:Filling and solidification for aluminum alloy packing block in die casting were simulated by numerical simulation. Distribution and change of...
2362