Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of (Ti-B) and Sr Additives on Impact and Fatigue Properties of Recycled AC4A Aluminum Casting Alloy

재활용 AC4A 알루미늄 합금의 충격 및 피로 특성에 미치는 (Ti-B), Sr 첨가제의 영향

  • Oh, Seung-Hwan (Department of Metallurgical Eng, Pukyong National Graduate School) ;
  • Kim, Heon-Joo (Department of Metallurgical Eng, Pukyong National Univ.)
  • 오승환 (부경대학교 대학원 금속공학과) ;
  • 김헌주 (부경대학교 공과대학 금속공학과)
  • Received : 2019.06.27
  • Accepted : 2019.08.12
  • Published : 2019.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

The effects of Sr and (Ti-B) additives on the impact and fatigue properties of recycled (35% scrap content) AC4A aluminum alloy are investigated here. The acicular morphology of the eutectic Si phase of as-cast specimens was converted to the fibrous one with Sr additives. The grain size of the α-solid solution decreased by the addition of (Ti-B) additives. The crack initiation energy (Ei) of the impact absorption energy decreased due to the incorporation of an oxide film and inclusions depending on the scrap used. The modification of the eutectic Si morphology by Sr additives is considered as the main factor of the increase of the average impact absorption energy (Et). The addition of (Ti-B) additives contributed to an increase in the occurrence of crack deflections due to the refining of α-Al grains, resulting in improved fatigue properties.

Keywords

References

  1. Ministry of Environment, "Eco-friendly car", (2015) 1-64.
  2. Samjung KPMG, "Issue monitor", 96 (2018) 5-10.
  3. Wolf S and Hoberg H, 3rd ASM International Conference Recylcling Metals, ASM International, Brussels (1997) 257-267.
  4. Mark E. Schlesinger, Aluminum Recycling, CRC Press, Taloy & Francis Group, London (2007) 4.
  5. Kim HJ, J. Korea Foundry Society, "Effect of Fe, Mn content on the tensile property of Al-4wt%Mg-0.9%Si alloy system for high pressure die casting", 33 (2013) 103-112. https://doi.org/10.7777/jkfs.2013.33.3.103
  6. Stefano C. and Giulio T., Metals, "Preparation and melting of scrap in aluminum", 8 (2018) 1-24. https://doi.org/10.3390/met8010001
  7. Kim HJ, J. Korea Foundry Society, "Effect of scrap content on the impact perperty and fatigue property of AC4A alloy", 36 (2016) 187-194. https://doi.org/10.7777/jkfs.2016.36.6.187
  8. Kim HJ, J. Korea Foundry Society, "Effect of scrap content on hot tearing property of AC2BS alloy", 36 (2016) 67-74. https://doi.org/10.7777/jkfs.2016.36.2.67
  9. Oh SH and Kim HJ, J. Korea Foundry Society, "Effect of minor additives on casting property of AC4A aluminum casting alloy", 37 (2017) 148-156. https://doi.org/10.7777/jkfs.2017.37.5.148
  10. Oh SH and Kim HJ, J. Korea Foundry Society, "Effect of Sr and (Ti-B) additives on tensile property of AC4A recycled aluminum casting alloy", 38 (2018) 87-94. https://doi.org/10.7777/JKFS.2018.38.5.087
  11. Gruzleski JE. and Closset BM, The Treatment of Liquid Aluminum-Silicon Alloys, The American Foundry's Society, Inc., USA (1990) 39-41.
  12. ASTM E23-07, Standard test methods for Notched Bar Impact Testing of Metallic Materials, ASTM International., PA (2007).
  13. ASTM E2948-14, Standard test method for conducting rotating bending fatigue tests of solid round fine wire, ASTM International., PA (2014).
  14. Newman J.C. and Piascik R.S., STP 1372 : Fatigue crack growth thresholds, endurance limits and design, ASTM International, PA (2000) 285-303.
  15. Easton M and StJohn D, Metallurgical and Materials Transactions A, "Grain refinement of aluminum alloys Part 1. The nucleant and solute paradigms-A review of the literature", 30 (1999) 1613-1623. https://doi.org/10.1007/s11661-999-0098-5
  16. Basavakumar K.G. P.G. Mukunda and M. Chakraborty, International Journal of Impact Engineering, "Impact toughness in Al-12Si and Al-12Si-3Cu cast alloys-Part 1: Effect of process variables and microstructure", 35 (2008) 199-205. https://doi.org/10.1016/j.ijimpeng.2007.03.002
  17. Zamani, Licentiate Thesis, School of Engineering Jonkoping University, "Al-Si cast alloy - Microstructure and mechanical properties at ambient and elevated temperature" (2015) 45-47.
  18. Polmear I., et al., "Cast Aluminium Alloy in Light Alloys". (2017) 265-286.
  19. R.W.Hertzberg, Deformation and fracture mechanics of engineering materials. 2 ed, John Willey & Sons, USA (1983) 511-514.
  20. Masuda C. and Y. Tanaka, Transactions of the Japan Society of Mechanical Engineering Part. A, "Relationship between fatigue strength and hardness for high strength steels", 52 (1983) 847-852. https://doi.org/10.1299/kikaia.52.847
  21. Qandil A. and A.I.O. Zaid, IOP Conference Series: Materials Science and Engineering, "Effect of shot peening and grain refinement on the fatigue life and strength of commercially pure Al and two of its alloys: Al-2024-T3 and Al-7075-T6", 146 (2016).
  22. Pio L.Y., Journal of Applied Science, "Effect of T6 heat treatment on the mechanical properties of gravity die cast A356 aluminum alloy", 11(2011) 2048-2052. https://doi.org/10.3923/jas.2011.2048.2052
  23. Yin D., Liu H., Chen Y., Yi D., Wang B., Wang B., Shen F., Fu S., Tang C. and Pan S., International Journal of Fatigue, "Effect of grain size on fatigue-crack growth in 2524 alluminium alloy", 84 (2016) 9-16. https://doi.org/10.1016/j.ijfatigue.2015.11.011
  24. T. Kobayashi, Strength and Toughness of materials, Srpringer, Berlin (2000) 5-10.