한국주조공학회지 (Journal of Korea Foundry Society)

  • 제37권5호
  • /
  • Pages.148-156
  • /
  • 2017
  • /
  • 1598-706X(pISSN)
  • /
  • 2288-8381(eISSN)
한국주조공학회 (Korea Foundry Society)
권호 표지
DOI QR코드

DOI QR Code

AC4A 알루미늄 합금의 주조특성에 미치는 미량 첨가원소의 영향

Effect of Minor Additives on Casting Properties of AC4A Aluminum Casting Alloys

  • 오승환 (부경대학교 대학원 금속공학과) ;
  • 김헌주 (부경대학교 공과대학 금속공학과)
  • Oh, Seung-Hwan (Department of Metallurgical Eng, Pukyong National Graduate School) ;
  • Kim, Heon-Joo (Department of Metallurgical Eng, Pukyong National Univ.)
  • 투고 : 2017.07.21
  • 심사 : 2017.09.27
  • 발행 : 2017.10.31
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

The effects of minor additives on the casting properties of AC4A aluminum alloys were investigated. Measurements of the cooling curve and microstructure observations were conducted to analyze the effects of Ti-B and Sr minor elements during the solidification process. A fine grain size and an increase in the crystallization temperature for the ${\alpha}-Al$ solution were evident after the addition of 0.1wt% Al-5%Ti-1%B additive. The modification effect of the eutectic $Mg_2Si$ phase with the addition of 0.05% Al-10%Sr additive was prominent. A fine eutectic $Mg_2Si$ phase and a decrease in the growth temperature of the eutectic $Mg_2Si$ phase were evident. Fluidity, shrinkage and solidification-cracking tests were conducted to evaluate the castability of the alloy. The combined addition of Al-5%Ti-1%B and Al-10%Sr additives showed the maximum filling length owing to the effect of the fine ${\alpha}-Al$ grains. The macro-shrinkage ratio increased, while the micro-shrinkage ratio decreased with the combined addition of Al-5%Ti-1%B and Al-10%Sr additives. The macro-shrinkage ratio was nearly identical, while the micro-shrinkage ratio increased with the addition of the Al-10%Sr additive. The tendency of the occurrence of solidification cracking decreased owing to the effect of the fine ${\alpha}-Al$ grains and the modification of the $Mg_2Si$ phase with the combined addition of Al-5%Ti-1%B and Al-10%Sr additives.

키워드

참고문헌

  1. J. L. Jorstad, Die Casting Engineer, "Future technology in aluminium die casting", 9 (2006) 18-25.
  2. H. Koch, U. Hielsher, H. Sternau and A. J. Franke, Light Metals 1995 : TMS, "Silafont-36, the new low iron high-pressure die-casting alloy", Las Vegas, USA Feb. (1995) 1011-1018.
  3. Lee HI, Han YS, Kim DH and Kim WT, Steel and Metal News, "Understanding and utilization of aluminium application technology", Seoul (2005) 45-46.
  4. Kim JM, Seong KD and Jun JH, J. Korea Foundry Society, "Variation of fluidity and mechanical properties of Al-Mg alloys with the addition of Si, Mn and Zn", 24 (2004) 138-144.
  5. D.G. McCatney, Int. Mater. Rev., "Grain refining of aluminum and its alloys using inoculants", 34 (1989) 247-260. https://doi.org/10.1179/imr.1989.34.1.247
  6. B. S. Murty, S. A. Kori and M. Chakraborty, Int. Mater. Rev., "Grain refinement of aluminum and its alloys by heterogeneous nucleation and alloying", 47 (2002) 3-29. https://doi.org/10.1179/095066001225001049
  7. A. Lindsay Geer et al., Adv. Eng. Mater., "Grain refinement of aluminum alloys by inoculation", 5 (2003) 81-91. https://doi.org/10.1002/adem.200390013
  8. K. Al-Helal, I.C. Stone and Z. Fan, Transactions of the Indian Institute of Metals, "Simultaneous primary Si refinement and eutectic modification in hypereutectic Al-Si alloys", 65 (2012) 663-667. https://doi.org/10.1007/s12666-012-0171-4
  9. M. Easton, D. StJohn, Metallurgical and Materials Transactions A, "Grain refinement of aluminum alloys : Part. the nucleant and solute paradigms-a review of the literature", 30 (1999) 1613-1623. https://doi.org/10.1007/s11661-999-0098-5
  10. T. Chandrashekar, M. K. Muralidhara, K. T. Kashyap and P. Raghothama Rao, Int. J. Manuf. Technol., "Effect of growth restricting factor on grain refinement of aluminum alloys", 40 (2009) 234-241. https://doi.org/10.1007/s00170-007-1336-x
  11. M. Timpel, N. Wanderka, R. Schlesiger, T. Yamamoto, N. Lazarev, D. Isheim, G. Schmitz, S. Matsumura and J. Banhart, Acta Materialia, "The role of strontium in modifying aluminium-silicon alloys", 60 (2012) 3920-3928. https://doi.org/10.1016/j.actamat.2012.03.031
  12. J. L. Jorstad, Wayne and D. L. Zalensas., "Aluminum Casting Technology 2nd Edition", American Foundrymen's Society Inc (1997) 21-26.
  13. Kim HJ, J. Korea Foundry Society, "Effect of Sc, Sr Elements on Eutectic Mg2Si Modification and Castability of Al-4wt%Mg-0.9wt%Si-0.3wt%Mn-0.15wt%Fe Casting Alloy", 35 (2015) 147-154. https://doi.org/10.7777/jkfs.2015.35.6.147
  14. Kim HJ, J. Korea Foundry Society, "Effect of Mold Preheat Temperature on Solidification Crack Strength of AC2B Aluminum Alloy", 34 (2014) 162-169. https://doi.org/10.7777/jkfs.2014.34.5.162
  15. K. R. Ravi, R. M. Pillai, K. R. Amaranathan, B. C. Pai and M. Chakraborty, Journal of Alloys and Compounds, "Fluidity of aluminium alloys and composites: A review (2007)", 456 (2007) 201-210.
  16. A. K. Dahle, P. A. Tondel, C. J Paradies and L. Arnberg, Metallurgical and Materials Transactions A, "Effect of grain refinement on the fluidity of two commercial Al-Si foundry alloys", 27 (1996) 2305-2313. https://doi.org/10.1007/BF02651885
  17. Kwon YD, Lee ZH and Kim KH, J. Korea Foundry Society "The Effect of Grain Refinement on Fluidity of Al-4.8%Cu-0.6%Mn alloy", 22 (2002) 109-113.
  18. Kim MH and Lee JT, J. Korea Foundry Society, "The effect of Sc on the microstructure of Hypoeutectic Al-Si Alloys", 24 (2004) 145-152.
  19. P. D. LEE, A. Chirazi and D. See, Journal of Light Metal, "Modeling microporosity in aluminium-silicon alloys", 1 (2001) 15-30. https://doi.org/10.1016/S1471-5317(00)00003-1
  20. M. Bruna, A. Sladek and L. Kucharcik, Archives of Foundry Engineering, "Formation of porosity in Al-Si alloys", 12 (2012) 5-8.
  21. M. Petric, J. Medved, P. MRVAR, Metallurgy, "Effect of grain refinement and modification of eutectic phase on shrinkage of AlSi9Cu3 alloy", 50 (2011) 127-131.
  22. L. Lu, K. Nogita, S. D. McDonald, and A. K. Dahle, The Journal of the Minerals, Metals & Matrerials Society (TMS), "Eutectic Solidification and its Role in Casting Porosity Formation" (2004), 56 (2004) 52-58.
  23. Kim HJ, J. Korea Foundry Society, "Effect of Ti, B, Zr Elements on Grain Refinement and Castability of Al-4wt%Mg-0.9wt%Si-0.3wt%Mn-0.15wt%Fe Casting Alloy", 35 (2015) 120-127. https://doi.org/10.7777/jkfs.2015.35.5.120
  24. D. G. Eskin and L. Katgerman, Metallurgical and Materials Transaction A, "A Quest for a New Hot Tearing Criterion", 38 (2007) 1511-1519. https://doi.org/10.1007/s11661-007-9169-7
  25. Y. Li, Q. L. BAI, J. C. LIU, H. X. LI, Q. DU, J. S. ZHANG and L. Z. ZHUANG, Metallurgical and Materials Transactions A, "The Influence of Grain Refinement and Morphology on the Hot Tearing Susceptibility, Contraction, and Load Behaviors of AA7050 Alloy Inoculated with Al-5Ti-1B Master alloy", 47A (2016) 4024-4037.
  26. H. G. Fjaer, A. Mo, Metallurgical and Materials Transactions B, "A Mathematics Model for Thermal Stresses in Direct Chill Casting of Aluminium Billet", 21 (1990) 1049-1061. https://doi.org/10.1007/BF02670275
  27. B. Magnin, L. Katgerman and B. Hannart, Minerals, Metals and Materials Society, "Physical and numerical modelling of thermal stress generation during DC casting of Aluminium alloys", (1995) Warrendale, Pennsylvania, 303-310.
  28. M. Rappaz, J. M. Drezet and M. Gremaud, Metallurgical and Materials Transactions B, "A new hot-tearing criterion", 30 (1999) 449-455. https://doi.org/10.1007/s11661-999-0334-z
  29. N. N. Prokhorov, Russian Casting Production, "Resistance to hot tearing of cast metals during solidification" 2 (1962) 172-175.