A New Designed Hot Tearing Apparatus Based on the Applied Forces

Abstract:

The objective of this paper is to introduce a simple experimental apparatus based on the applied forces for quantitative assessment on hot tearing behavior in aluminum alloys. According to the experimental procedure, molten metal is cast in the rod-shaped mold cavity. One side of the casting specimen is hooked by a steel bolt which restrains its free contraction and transfers the tensile forces during solidification. A steel threaded rod connected to a load cell which records the real-time measurement of the tensile forces during every experiment. Thermal history is monitored by K-type thermocouple. The data of the temperature and tensile forces are acquired by a data acquisition system. Test of the experimental apparatus is conducted with A356 and Al-5wt%Cu alloy to investigate the accuracy of the experimental apparatus and modify its operating parameter. The tensile forces curves and the temperature curves of the specimens are obtained by experiment. This data provide useful information about hot tearing formation and solidification characteristics, from which their quantitative relations are derived. In this manner, the hot tearing behavior in aluminum alloys can be studied by this experimental apparatus based on the applied forces.

• Periodical: Applied Mechanics and Materials (Volumes 351-352)
• Pages: 1066-1071
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.351-352.1066
• Online since: August 2013
• Authors: Rong Fu Xu*, Hong Liang Zheng, Yong Zhang, Su Pei Ding, San Ping Zhang, Xue Lei Tian
• Keywords: Aluminium Alloy, Applied Force, Experimental Apparatus, Hot Tearing

References

[1] W. -B. Kim, W. -S. Lee, B. -J. Ye. Effect of casting conditions and grain refinement on hot-tearing behavior in A356 Al alloy. American Foundry Society Transactions. 2000: 541.

[2] David Viano, David StJohn, John Grandfield, Cáceres C. Hot tearing in aluminium-copper alloys. The Minerals, Metals & Materials Society. 2005: 5.

DOI: 10.1007/978-3-319-48228-6_112

[3] Miettinen J. Thermodynamic–kinetic model for the simulation of solidification in binary copper alloys and calculation of thermophysical properties. Comp Mater Sci. 2006; 36: 367-80.

DOI: 10.1016/j.commatsci.2005.05.004

[4] Eskin DG, Katgerman L. A Quest for a New Hot Tearing Criterion. Metallurgical and Materials Transactions A. 2007; 38: 1511-9.

DOI: 10.1007/s11661-007-9169-7

[5] Mitchell JB, Cockcroft SL, Viano D, Davidson C, StJohn D. Determination of Strain during Hot Tearing by Image Correlation. Metallurgical and Materials Transactions A. 2007; 38: 2503-12.

DOI: 10.1007/s11661-007-9221-7

[6] Colley LJ, Wells MA, Maijer DM. Tensile properties of as-cast aluminum alloy AA5182 close to the solidus temperature. Materials Science and Engineering: A. 2004; 386: 140-8.

DOI: 10.1016/s0921-5093(04)00928-1

[7] Hatami N, Babaei R, Dadashzadeh M, Davami P. Modeling of hot tearing formation during solidification. J Mater Process Tech. 2008; 205: 506-13.

DOI: 10.1016/j.jmatprotec.2007.11.260

[8] M. R. Nasresfahani, Niroumand B. Design of a new hot tearing test apparatus and modification of its operation. Met Mater Int. 2010; 16: 35-8.

DOI: 10.1007/s12540-010-0035-6

[9] Shabani MO, Alizadeh M, Mazahery A. Modelling of mechanical properties of cast A356 alloy. Fatigue Fract Eng M. 2011: 2-4.

DOI: 10.1111/j.1460-2695.2011.01592.x

[10] Li Min, Wang Hongwei, Wei Zunjie, Zhu Zhaojun. The effect of Y on the hot-tearing resistance of Al–5wt. % Cu based alloy. Mater Design. 2010; 31: 2483-7.

DOI: 10.1016/j.matdes.2009.11.044

[11] Shimin Li. Hot Tearing in Cast Aluminum Alloys. Worcester Polytechnic Institute. 2010: 46-50.

[12] Eskin DG, Suyitno, Katgerman L. Mechanical properties in the semi-solid state and hot tearing of aluminium alloys. Progress in Materials Science. 2004; 49: 629-711.

DOI: 10.1016/s0079-6425(03)00037-9

[13] L. Bichler, Ravindran C. New developments in assessing hot tearing in magnesium alloy castings. Mater Design. 2010; 31: S17-S23.

DOI: 10.1016/j.matdes.2009.12.003

[14] Tzamtzis S. Solidification Behaviour and Mechanical Properties of Cast Mg-alloys and Al-based Particulate Metal Matrix Composites Under Intensive Shearing. Brunel University. (2011).

[15] I. Farup, J. -M. Drezet, Rappaz M. In situ observation of hot tearing formation in succinonitrile-acetone. Acta mater. 2001: 1261–9.

DOI: 10.1016/s1359-6454(01)00013-1