Conclusions
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1.
Despite the relatively low hydrogen content in the laboratory heats (about 0.12 cm3/100 g) zones of porosity were observed in the fractures of the majority of the investigated specimens.
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2.
The porosity observed in the heats containing strontium has a microshrinkage character.
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3.
Alloying of hypoeutectic silumins with zirconium within the investigated limits reduces somewhat the tendency of the alloy toward the formation of microshrinkage porosity but it does not compensate the influence of strontium. A further increase in zorconium content leads to embrittlement as the result of precipitation of (Ti, Zr)SiAl3-phase.
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4.
To obtain castings with a guaranteed dense structure it is necessary to provide strengthened feed of the castings or to use special casting methods (casting under a low pressure, casting with back pressure, precision casting).
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Literature Cited
N. L. Kutsenok, A. A. Andrushevits, I. N. Ganiev, and V. N. Yanchuk, "Technical features of modification of silumins with aluminum-strontium alloy additions", Tekh. Avtomobilestroeniya, No. 8, 7–10 (1983).
M. N. Stepnov, Statistical Processing of Mechanical Test Results [in Russian], Mashinostroenie, Moscow (1972).
Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 45–47, February, 1987.
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Kutsenok, N.L., Ganiev, I.N. & Yanchuk, V.N. Porosity occurring in modification of hypoeutectic silumins with strontium and zirconium. Met Sci Heat Treat 29, 146–149 (1987). https://doi.org/10.1007/BF00667530
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DOI: https://doi.org/10.1007/BF00667530