Authors: Pekguleryuz, M. O.¹; Lin, S.²; Ozbakir, E.³; Temur, D.³; Aliravci, C.⁴

Source: International Journal of Cast Metals Research, Volume 23, Number 5, October 2010 , pp. 310-320(11)

Publisher: Maney Publishing

Abstract:

Hot tear susceptibility (HTS) of Al–Si alloys in the 0–5–3·0 wt-%Si has been determined using a constrained rod casting test and a quantitative index. Hot tear susceptibility was seen to decrease with increasing silicon content. Hot tear severity varied directly with solidification shrinkage?, the non-equilibrium freezing range ?T?, dendrite arm spacing and the effective grain size d_eff. The highest HTS was seen in the Al–0·5%Si alloy with the largest ?T?, the highest ?, the largest dendrite arm spacing, the lowest amount of eutectic phase f_eu, and, hence, the longest local freezing time t_f. Correlation was observed between HTS and the theoretical hot tear criteria Clyne–Davies CSC, Feurer and Campbell CSC_b indices, with Campbell's criterion showing a very strong correlation as HTS_c?0·03CSC_b + 6 with R²=0·93, where HTS_c is HTS of rod C.Hot tear susceptibility (HTS) of Al–Si alloys in the 0–5–3·0 wt-%Si has been determined using a constrained rod casting test and a quantitative index. Hot tear susceptibility was seen to decrease with increasing silicon content. Hot tear severity varied directly with solidification shrinkage?, the non-equilibrium freezing range ?T?, dendrite arm spacing and the effective grain size d_eff. The highest HTS was seen in the Al–0·5%Si alloy with the largest ?T?, the highest ?, the largest dendrite arm spacing, the lowest amount of eutectic phase f_eu, and, hence, the longest local freezing time t_f. Correlation was observed between HTS and the theoretical hot tear criteria Clyne–Davies CSC, Feurer and Campbell CSC_b indices, with Campbell's criterion showing a very strong correlation as HTS_c?0·03CSC_b + 6 with R²=0·93, where HTS_c is HTS of rod C.

Keywords: SHRINKAGE; ALUMINIUM; DAS; HOT TEAR; SILICON; FREEZING RANGE

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/136404610X12738456167267

Affiliations: 1: McGill University, Montreal, Quebec, Canada;, Email: mihriban.pekguleryuz@mcgill.ca 2: L&P Incorporated, Schukra North America, Lakeshore Ontario, Canada 3: McGill University, Montreal, Quebec, Canada 4: CRTC, Ecole Polytechnique, Montreal, Quebec, Canada

Publication date: 2010-10-01

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