Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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A study on the Microstructural Changes with Modification and Cast-forging in Hypoeutectic Al-Si Alloys

아공정 Al-Si 합금의 개량처리와 주단조에 의한 조직변화에 관한 연구

  • Yoon, Ji-Hyun (The School of Materials Science and Engineering, University of Ulsan) ;
  • Seol, Eun-Cheol (The School of Materials Science and Engineering, University of Ulsan) ;
  • Kim, Eok-Soo (Dong-Nam precision Co., Ltd.) ;
  • Lee, Kwang-Hak (The School of Materials Science and Engineering, University of Ulsan)
  • 윤지현 (울산대학교 첨단소재공학부) ;
  • 설은철 (울산대학교 첨단소재공학부) ;
  • 김억수 (동남정밀(주)) ;
  • 이광학 (울산대학교 첨단소재공학부)
  • Published : 2002.02.20
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Abstract

For application of cast-forging process with Al-Si alloys, casting experiments are carried out by adding Sr and TiB to Al-Si alloys for grain refinement treatment. We experimented on the mechanical properties according to microstructural changes, forging ability test and also investigated the mechanical properties after forging. The finest microstructure could be observed respectively when 0.05 wt.%Sr and 0.1 wt.%TiB were added. In this case, tensile strength and elongation increased much more than as casting. After high temperature deformation simulation test with grain refinement specimens was carried out, about 60N per unit $area(mm^2)$ of specimen was confirmed. After hot forging, tensile strength and elongation were increased. It was considered that casting defect was removed by compressive working.

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References

  1. Toshihiro Chikada : J. of Japan institute of light metals, Vol. 40, No. 12 (1990) 944 https://doi.org/10.2464/jilm.40.944
  2. Normang. Gjostein : Advanced Materials & Process, 137 (1990) 73
  3. Claus Razim : Advanced Materials & Process, 137 (1990) 75
  4. T. Uno and Yoshida : SUMITOMO LIGHT METAL TECHNICAL REPORTS, Vol. 27, No. 4 (1986) 22
  5. H. Hosomi : SUMITOMO LIGHT METAL TECHNICAL REPORTS, Vol. 32, No. 1 (1991) 1
  6. H.K.Choi:New technology, Vol.4, No.6 (1990) 1 https://doi.org/10.1007/BF00119586
  7. Masato FUJITA : J. of Japan institute of light metals, Vol.39, No. 9 (1989) 664 https://doi.org/10.2464/jilm.39.664
  8. H. Ichimura : 57th World Foundry Congress, Osaka, Sep. (1990), paper No.18
  9. F. Fukizawa and H. Shiina : The technology of Automobile, Vol. 46, No, 5 (1992) 66
  10. Tetsuzo NISHIMURA : J. of Japan institute of light metals, Vol. 47, No. 11
  11. J. of the Aluminum, 7 (1995) 42
  12. Kouichi YAMASHITA and Kazuaki YOKOKAWA : Quality Assurance Sector, Forging works, Casting & Forging Division, Furukawa Aluminum Co., Ltd, p. 72-86
  13. Tsunehisa SEKIGUCHI : J. of Japan institute of light metals, Vol. 44, No. 12
  14. Sanji Kitaoka and Hisashi Hori : J. of the Japan Foundrymen's Society, Vol. 66, No. 12 (1994)
  15. K. Y. Kim: J. of the Korean Foundrymen's Society, Vol. 20, No.4
  16. R. W. Heine, C. R. Loper, Jr. and P. C. Rosenthal : Principles of Metal Casting, McGraw-Hill, New-York (1967)
  17. J. E. Gruzleski : B. M. Closset, The Treatment of Liquid Aluminium-Silicon Alloys, AFS, Illinois (1990)
  18. P. B. Crosley, L. F. Mondolfo : Mod.,Casting, 49 (1966) 53
  19. C. H. Caceres, J. R. Griffiths : Acta. Meter., Vol. 44, No. 1 (1960) 25
  20. Akihiko, Hiroyasu : J. of the Japan Foundrymen's Society, Vol. 51, No. 7 (1978) 34