Microstructure Evolution and Macro Segregation of Directionally Solidified Hypoeutectic and Hypereutectic Lead-Tin Alloys

K.V. Sreenivas Rao; N. Akhil

doi:10.4028/www.scientific.net/MSF.895.3

Paper Titles

Microstructure Evolution and Macro Segregation of Directionally Solidified Hypoeutectic and Hypereutectic Lead-Tin Alloys
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HomeMaterials Science ForumMaterials Science Forum Vol. 895Microstructure Evolution and Macro Segregation of...

Microstructure Evolution and Macro Segregation of Directionally Solidified Hypoeutectic and Hypereutectic Lead-Tin Alloys

Abstract:

Unidirectional solidification is preferred to multidirectional solidification for growing crystals in a particular direction. An experimental set-up consisting of Bridgman type of upward directional solidification was employed for the present investigation. The main aim of the present investigation was to assess the effect of unidirectional upward solidification on the segregation of off-eutectic Pb-Sn alloys at different translational speeds of the experimental set-up. Solidification experiments were conducted on hypoeutectic and hypereutectic Lead-Tin alloys. Different combinations of growth rate V and composition Co. were used to investigate their effect on longitudinal macro segregation. Macro segregation along the length of the samples was observed in hypoeutectic Pb-Sn alloys whereas no such macro segregation was observed in hypereutectic alloys. The intensity of longitudinal macro segregation was found to increase with the increase in initial tin content of the alloy, increase in distance from the chill end and decrease in the solidification rate.

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Materials Science Forum (Volume 895)

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3-7

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https://doi.org/10.4028/www.scientific.net/MSF.895.3

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Online since:

March 2017

Authors:

K.V. Sreenivas Rao*, N. Akhil

Keywords:

Directional Solidification, Growth Rate, Macro Segregation

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