회주철의 수축결함생성에 미치는 주조방안 및 화학조성의 영향

류성곤; Sung-Kon Yu

Korean Journal of Materials Research, Vol.13, No.5, 297-302, May, 2003

DOI10.3740/MRSK.2003.13.5.297 Export Citation

회주철의 수축결함생성에 미치는 주조방안 및 화학조성의 영향

Effects of Risering Design and Chemical Composition on Formation of Shrinkage Cavity in Gray Cast Iron

류성곤^†

계명대학교 신소재공학과

Sung-Kon Yu^†

Dept. of Advanced Materials Engineering, Keimyung University, Daegu, 704-701, Korea

E-mail:

The effects of risering design and alloying element on the formation of defects such as external depression, primary and secondary shrinkage cavity in gray cast iron were investigated. Two types of risering design for the cylindrically step-wise specimen, No. 1(progressive solidification) and No. 2(directional solidification) risering designs, were prepared and five different alloy compositions were casted. In the No. 1 risering design, external depression or primary shrinkage cavity due to liquid contraction was observed in all the specimens from ISO 150 to ISO 350. The primary shrinkage cavity was located right under the top surface or connected to the top surface, and was characterized by smooth surface. Its size increased with an increase in ISO number. However, neither secondary shrinkage cavity nor swollen surface was observed in all the castings. In the No.2 risering design, neither primary shrinkage cavity nor secondary shrinkage cavity was observed in all the specimens due to proper risering design. A swollen surface was also not observed in all the castings with the application of pep-set mold.

Keywords:external depression;shrinkage cavity;progressive and directional solidification;swollen surface

[References]

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[1] AFS, Introduction to Gray Cast Iron Processing, p5, AFS Publication (2000) (2000)

[2] Dioszegi A, Wessen M, in Proceedings of the Modeling of Casting, Welding and Advanced Solidification Processes-IX (Aachen, Germany, August 2000). ed. Sahm P, Hansen P (RWTH, Aachen, Germany, 2000) p.869 (2000)

[3] Leube B, Arnberg L, Mai R, in Proceedings of the Modeling of Casting, Welding and Advanced Solidification Processes-VIII (San Diego, USA, June 1998). ed. Beckermann C(University of Iowa, Iowa City, USA, 1998) p.463 (1998)

[4] Schwenkel S, Doepp R, in Proceedings of the 65th World Foundry Congress (Gyeongju, Korea, October 2002). ed. C. Hong (Yonsei University, Korea, 2002) p.121 (2002)

[5] Oumnoi N, Bhandhubanyong P, in Proceedings of the 4th Pacific Rim International Conference on Modeling of Casting & Solidification Processes 1999 (Seoul, Korea, September 1999). ed. Hong C(Yonsei University, Korea, 2002) p.97 (2002)

[6] Guo X, Catalina A, Stefanescu DM, Chuzhoy L, Pershing M, in Proceedings of the 3rd Pacific Rim International Conference on Modeling of Casting & Solidification Processes 1996 (Beijing, China, December, 1996). ed. Liu B (Tsinghua University, China, 1996) p.25 (1996)

[7] Horie H, Kowata T, Hiratsuka S, Yang Z, in Proceedings of the 5th Asian Foundry Congress (Nanjing, China, China September, 1997O. ed. Sun G(Southeast University, China, 1997) p.147 (1997)

[8] Lin H, Wei B, Cai Q, Wang B, in Proceedings of the 2nd Asian Foundry Congress (Kitakyushu, Japan, October, 1994). ed. Ogi K (Kyushu University, Japan, 1994) p.11 (1994)

[9] Ohnaka I, Introduction to Computer Simulation, p.302, Maruzen Publication(1985) (1985)

[10] Karsay SI, Ductile Iron Production Practices, p.111, AFS Publication (1985) (1985)

[11] Karsay SI, Ductile Iron Gating and Risering, p.85, QIT INC (1981) (1981)