Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
권호 표지
DOI QR코드

DOI QR Code

Evaluation of the Characteristics of the Aluminum Alloy(AC8A) Casting Material by Heat Treatment(II)

AC8A 알루미늄 합금 주조재의 열처리에 의한 특성 평가(II)

  • Moon, Kyung-Man (Dept. of Marine Equipment Engineering, Korea Maritime and Ocean University) ;
  • Jeong, Jae-Hyun (Dept. of Mechanical & Energy System Engineering, Korea Maritime and Ocean University) ;
  • Lee, Myeong-Hoon (Dept. of Marine System Engineering, Korea Maritime and Ocean University) ;
  • Baek, Tae-Sil (Dept. of Steel Industry, Pohang College)
  • 문경만 (한국해양대학교 공대 조선기자재공학부) ;
  • 정재현 (한국해양대학교 공대 기계에너지시스템공학부) ;
  • 이명훈 (한국해양대학교 해사대학 기관시스탬공학부) ;
  • 백태실 (포항대학교 제철산업과)
  • Received : 2016.06.15
  • Accepted : 2016.10.04
  • Published : 2016.10.31
Download PDF
⟨ Previous Next ⟩

Abstract

Aluminum alloys have been widely used in engine materials, cold & hot-water storage vessels and piping etc., Furthermore, the aluminum alloy of AC8A have been widely used in mold casting material of engine piston for various vehicles because of its properties of temperature, wear and corrosion resistance. Therefore, it is considered that evaluation of corrosion resistance as well as wear resistance of AC8A material is also important to improve its property and to prolong its lifetime. In previous paper, the effect of solution($510^{\circ}C$:4hrs) and tempering($190^{\circ}C$: 16, 24, and 36 hrs)heat treatments to corrosion resistance and hardness were investigated using electrochemical method. In this study, in order to examine completely the effect of the tempering hours to hardness variation and corrosion resistance, the results of solution($510^{\circ}C$:4hrs) and tempering($190^{\circ}C$: 2, 4, 8 and 12hrs)heat treatments to hardness and corrosion resistance were investigated using electrochemical method. The hardness decreased with solution heat treatment compared to mold casting condition, but its value increased with tempering heat treatment. Furthermore, the corrosion resistance increased with decreasing of the hardness, and decreased with increasing of the hardness reversely. And the tempering heat treatment temperature at $190^{\circ}C$ for 8 hrs exhibited the highest value of the hardness and also indicated the highest corrosion current density. However, the values of hardness and corrosion current density was again increasingly decreased with increasing of tempering hours than 8 hrs, Consequently, it is suggested that decision of the optimum. tempering hours is very important to improve the corrosion or wear resistance.

Keywords

References

  1. H. Y. Lee, 1991, "Metal Corrosion Engineering", Yeon Kyung Culture Publishing Co., p. 262.
  2. M. Y. Doshi, 1975 "Nonferrous Metal Matewrial Engineering", Ko Ro Na Publishing Co., p. 144.
  3. D. H. Yun, M, .H. Lee, K. J. Kim and K. M Moon, 2005, "Electrochemical Evaluation on the Corrosion Resistance of Al Alloy", Journal of the Korean Society of Marine Engineering, Vol. 29, No. 5, p. 495.
  4. Mars. G. Fontana, 1986, "Corrosion Engineering", Mc Graw Hill Book company, p. 236.
  5. Deny A. Jones, 1996, "Principles and Prevention of Corrosion", Prentice Hall International Publishing Co., p. 262, p. 307, p. 522.
  6. J. W. Martin, 1968, "Precipation Hardening", Oxford Pergamon Publishing Co., pp. 267.
  7. Y. Murakami, 1985, "Fundamentals and Industrial Technologies of Aluminum Materials", Japan Light Metals Association, pp. 523.
  8. Y. Murakami, 1991, "Advanced Materials and Technology", Proceeding 2nd International Conference Kobe, Japan, pp. 113-122.
  9. A., Hellawell, 1990, "Supplementary Volume 2 of the Encyclopedia of Materials Science and Engineering", Oxford Pergamon Publishing Co., p. 78.
  10. H. W. Phillips, 1959, "Annotated Equilibrium Diagrams of Some Aluminum Alloys Systems, Monograph", London International Metals, No. 25, p. 57.
  11. A. Sakamoto, 1991, "Advanced Materials and Technology, and New Composites", Proceeding 2nd International Conference Hyogo, Japan, pp. 165-172.
  12. E. A. Starke, 1979, "Materials Science and Seminar", Proceeding ASM, p. 208.
  13. J. H Shin and K. M. Moon, 2010, "An electrochemical Evaluation on the Corrosion Resistance of Welding Zone due to kinds of Filler Metal and Post Weld Heat Treatment", Corrosion Science and Technology, Vol. 9, No. 6, p. 310.
  14. S, Y. Lee, M. H Lee, Y. H Kim, K. M. Moon and J. H Jeong, 2012, "Evaluation of the Characteristics of the Al Alloy Casting Material by Heat Treatment", Corrosion Science and Technology, Vol.11, No. 6, p. 280. https://doi.org/10.14773/cst.2012.11.6.280
  15. K. M. Moon, 1999, "Practical Electrochemistry", Hyo Sung Publishing Co., p. 177.
  16. D. H. Jeon, 1979, "Maintenance of Corrosion and Corrosion Control", Il Jung Sa Publishing Co., pp. 551-554.