Advertisement

Shape Casting pp 159-166 | Cite as

Investigation of Casting Quality Change of A356 by Duration in Liquid State

  • Muhammet UludağEmail author
  • Mikdat Gurtaran
  • Derya Dispinar
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

This study aims to investigate how casting quality change in aluminum melt during the holding period in liquid state. 10 kg of ingot was melted in a SiC crucible by using an electrical furnace. A sample was taken every five minutes from 0 to 55 min after the alloy was melted. Reduced pressure test (RPT) samples were collected to be solidified under 80 mbar. All samples were sectioned into two parts vertically, and one of them was prepared for metallographic examination. Surface of the samples was subjected to image analysis by using via image analysis software. Bifilm index and bifilm area were analyzed in detail. As a result, it can be concluded that first 30 min of liquid metal is important, because casting quality tends to get worse after 30 min.

Keywords

A356 alloy Bifilms Holding time Casting quality 

References

  1. 1.
    Campbell J (2003) Castings. ElsevierGoogle Scholar
  2. 2.
    Cole G, Sherman A (1995) Light weight materials for automotive applications. Mater Charact 35(1):3–9CrossRefGoogle Scholar
  3. 3.
    Miller W et al (2000) Recent development in aluminium alloys for the automotive industry. Mater Sci Eng A 280(1):37–49CrossRefGoogle Scholar
  4. 4.
    Rooy EL (2004) Aluminum alloy castings. Properties, Processes, and Applications 1:14–15Google Scholar
  5. 5.
    Zolotorevsky VS, Belov NA, Glazoff MV (2007) Casting aluminum alloys, vol 12. Elsevier AmsterdamGoogle Scholar
  6. 6.
    Dispinar D, Campbell J (2007) Effect of casting conditions on aluminium metal quality. J Mater Process Technol 182(1–3):405–410CrossRefGoogle Scholar
  7. 7.
    Cáceres C (1998) A rationale for the quality index of Al-Si-Mg casting alloys. Int J Cast Met Res 10(5):293–299CrossRefGoogle Scholar
  8. 8.
    Campbell J. (2015) Complete casting handbook: metal casting processes, metallurgy, techniques and design. Butterworth-HeinemannGoogle Scholar
  9. 9.
    Campbell J (2006) An overview of the effects of bifilms on the structure and properties of cast alloys. Metall Mater Trans B 37(6):857–863CrossRefGoogle Scholar
  10. 10.
    Campbell J (2016) The consolidation of metals: the origin of bifilms. J Mater Sci 51(1):96–106CrossRefGoogle Scholar
  11. 11.
    Campbell J (2006) Entrainment defects. Mater Sci Technol 22(2):127–145CrossRefGoogle Scholar
  12. 12.
    Campbell J (2012) Stop pouring, start casting. Int J Metalcast 6(3):7–18CrossRefGoogle Scholar
  13. 13.
    Kubo K, Pehlke RD (1985) Mathematical modeling of porosity formation in solidification. Metall Trans B 16(2):359–366CrossRefGoogle Scholar
  14. 14.
    Lee P, Chirazi A, See D (2001) Modeling microporosity in aluminum–silicon alloys: a review. J Light Met 1(1):15–30CrossRefGoogle Scholar
  15. 15.
    Anson J, Gruzleski J (1999) The quantitative discrimination between shrinkage and gas microporosity in cast aluminum alloys using spatial data analysis. Mater Charact 43(5):319–335CrossRefGoogle Scholar
  16. 16.
    Adler L, Rose JH, Mobley C (1986) Ultrasonic method to determine gas porosity in aluminum alloy castings: theory and experiment. J Appl Phys 59(2):336–347CrossRefGoogle Scholar
  17. 17.
    Uludağ M, Dişpinar D (2017) Assessment of mechanism of pore formation in directionally solidified A356 alloy. Arch Foundry Eng 17(1):157–162CrossRefGoogle Scholar
  18. 18.
    Uludağ M et al (2018) Change in porosity of A356 by holding time and its effect on mechanical properties. J Mater Eng Perform 1–11Google Scholar
  19. 19.
    Dispinar D, Campbell J (2004) Critical assessment of reduced pressure test. Part 1: porosity phenomena. Int J Cast Met Res 17(5):280–286CrossRefGoogle Scholar
  20. 20.
    Dispinar D, Campbell J (2011) Porosity, hydrogen and bifilm content in Al alloy castings. Mater Sci Eng A 528(10–11):3860–3865CrossRefGoogle Scholar
  21. 21.
    Dispinar D et al (2010) Degassing, hydrogen and porosity phenomena in A356. Mater Sci Eng A 527(16–17):3719–3725CrossRefGoogle Scholar
  22. 22.
    Mostafaei M et al (2016) Evaluation of the effects of rotary degassing process variables on the quality of A357 aluminum alloy castings. Metall Mater Trans B 47(6):3469–3475CrossRefGoogle Scholar
  23. 23.
    El-Sayed M, Griffiths W (2014) Hydrogen, bifilms and mechanical properties of Al castings. Int J Cast Met Res 27(5):282–287CrossRefGoogle Scholar
  24. 24.
    Felberbaum M, Dahle A (2011) Modification and grain refinement of eutectics to improve performance of Al-Si castings. In: Light metals 2011. Springer, p 815–820Google Scholar
  25. 25.
    Zuo Y et al (2011) Refining grain structure and porosity of an aluminium alloy with intensive melt shearing. Scripta Mater 64(2):209–212CrossRefGoogle Scholar
  26. 26.
    Campbell J, Tiryakioğlu M (2010) Review of effect of P and Sr on modification and porosity development in Al–Si alloys. Mater Sci Technol 26(3):262–268CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Muhammet Uludağ
    • 1
    Email author
  • Mikdat Gurtaran
    • 1
  • Derya Dispinar
    • 2
  1. 1.Metallurgical and Materials EngineeringBursa Technical UniversityBursaTurkey
  2. 2.Metallurgical and Materials EngineeringIstanbul UniversityIstanbulTurkey

Personalised recommendations