Interaction effect of green sand mixtures parameters on tensile strength mechanical property of cast aluminum 6351 using a statistical approach

Abstract

Mold properties of green sand mold which include green compression strength, permeability, and others are known to influence the quality of cast produced. The green sand used in the casting of aluminum specimens made of alloy 6351 in this work was made by varying the percentage proportions of sand mixtures- dextrin additive, bentonite clay, and moisture content. These variables were mixed with local silica sand to get the utmost operational parts of the mixture that will enhance green sand production of aluminum 6351 alloys. Optimal (custom) design of Design-Expert 10 software was used for Designing the experiment of this work and 20 runs were given. After the preparation of molds per run and casting, cast specimens obtained were subjected to a tensile strength test to achieve tensile strength results as the Response output of the study. The mixtures' most efficient ratios were reached by optimizing these experimental outcomes. From the findings, the optimal validation values of 4.35% water content, 10.73% bentonite clay, and 8.91% dextrin organic additive provided the greatest tensile strength of 246.05 MPa at (47.45 GSS and 105.58 PN).