Abstract
In gravity die casting, mold temperature is a significant parameter during filling and solidification. The selection of mold temperature is commonly based on individual experience in production. No clear specification of mold temperature is pointed out in the international standard. Therefore, in this study the experimental and simulated methods were used to compare the effect of the mold temperature on microstructure and shrinkage porosity during solidification of the A357 alloys. The GB/T 1173-2013 standard mold was used at different temperature (150, 250, 350 °C). The microstructure of sample was compared in each condition. It was found that increasing the mold temperature, which influenced the cooling rate in solidification, increased the second dendritic arm space of α-Al phase and the size of Si particles in microstructure. Moreover, increasing the mold temperature also decreased the temperature gradient of sample during solidification and impaired the filling of the liquid in dendrites. When the mold temperature was 150 °C, no shrinkage porosity was observed in the microstructure. When the mold temperature increased to 350 °C, severe shrinkage defects were observed on the fracture of the samples. The simulated method was also applied to determine the tendency of shrinkage porosity and the results calculated by ProCAST agreed well with the experimental results.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
F. Wang, Q. Ma, M. Wen, Z. Han, Experimental study on the heat transfer behavior and contact pressure at the casting-mold interface in squeeze casting of aluminum alloy. Int. J. Heat Mass Transf. 112, 1032–1043 (2017)
S.K. Rathi, A. Sharma, M.D. Sabatino, Effect of mould temperature, grain refinement and modification on hot tearing test in Al-7Si-3Cu alloy. Eng. Fail. Anal. 79, 592–605 (2017)
V. Vazquez, A. Juarez-Hernandez, A. Mascarenas, P. Zambrano, Cold shut formation analysis on a free lead yellow brass tap. Eng. Fail. Anal. 17, 1285–1289 (2010)
L. Bichler, A. Elsayed, K. Lee, C. Ravindran, Influence of mold and pouring temperatures on hot tearing susceptibility of AZ91D magnesium alloy. Int. J. Metalcast. Winter 43–54 (2008)
H. Huang, P. Fu, Y. Wang, L. Peng, H. Jiang, Effect of pouring and mold temperatures on hot tearing susceptibility of AZ91D and Mg–3Nd–0.2Zn–Zr Mg alloys. Trans. Nonferrous Met. Soc. China 24, 922–929 (2014)
G.F. Mi, X.Y. Liu, K.F. Wang, H.Z. Fu, Numerical simulation of low pressuredie-casting aluminum wheel. China Foundry. 6, 48–52 (2009)
C. Zhang, Y. Bao, M. Wang, L. Zhang, Shrinkage porosity criterion and its application to A 5.5 ton steel ingot. Arch. Foundry Eng. 16, 27–32 (2016)
X.G. Hu, Q. Zhu, H.V. Atkinson, H.X. Lu, F. Zhang, H.B. Dong, Y.L. Kang, A time-dependent power law viscosity model and its application in modelling semi-solid die casting of 319s alloy. Acta Mater. 124, 410–450 (2017)
W. Qu, F. Zhang, J. Wang, X. Hu, Q. Zhu, Effect of slurry temperature distribution on semi-solid die casting. Solid State Phenom. 256, 107–112 (2016)
J. Campbell, Castings, second edition, Butterworth-Heinemann, 2003, pp. 205–230
E. Niyama, T. Uchida, M. Morikawa, S. Saito, A method of shrinkage prediction and its application to steel casting practice. AFS, Int. Cast Met. J. 9, 52–63 (1982)
L. Pan, L. Zheng, H. Zhang, W. Gao, Applicability of shrinkage porosity prediction for casting with Niyama criterion. J. Beijing Univ. Aeronaut. Astronaut. 37, 1534–1540 (2011)
N. Yu, L. Zhu, X.Q. Dong, The achievement and verification of the optimum temperature gradient of metal casting without shrinkage porosity defect. Spec. Cast. Nonferrous Alloy. 36, 513–516 (2016)
Acknowledgements
This work was carried out with financial support from National Key Research and Development Program (2016YFB0301001): Production technology of high performance magnesium/aluminum alloy high quality castings. The financial support is gratefully acknowledged.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2018 Springer Nature Singapore Pte Ltd.
About this paper
Cite this paper
Li, L., Li, D., Gao, J., Zhang, Y., Kang, Y. (2018). Influence of Mold Temperature on Microstructure and Shrinkage Porosity of the A357 Alloys in Gravity Die Casting. In: Han, Y. (eds) Advances in Materials Processing. CMC 2017. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-13-0107-0_77
Download citation
DOI: https://doi.org/10.1007/978-981-13-0107-0_77
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-13-0106-3
Online ISBN: 978-981-13-0107-0
eBook Packages: EngineeringEngineering (R0)