Influence of Tin in Underlayer Material on Al-Si Alloy Structure Deposited Using Centrifugal Induction Method

Abstract

The results of metallographic studies, durometric and tribotechnical tests of coatings made of silumin AlSi12, deposited on a steel base by centrifugal induction surfacing are presented. To ensure the adhesion of the coating with the base during surfacing, babbit B83S and tin–lead solder POS61 were introduced to form a transition layer. It is established that when using B83S, tin is distributed throughout the coating with a certain degree of segregation to the steel base, and iron-containing inclusions are also present in the coating structure. The use of POS61 leads to increase in the homogeneity of the structure, while there are no inclusions of tin alloy. The obtained coatings are characterized by high tribotechnical properties. The average value of the coefficient of friction for the surfaced coatings using babbit is 0.031–0.037, and in the case of POS61, a decrease in the coefficient of friction to 0.010–0.013 with an increase in the load to 30 MPa is recorded. It is established that changes in the structure of the coating are mainly determined by the content of tin in the added alloy, and the presence of lead increases the rate of dissolution of iron in aluminum. It is assumed that the presence of iron-containing inclusions contributes to the tribotechnical properties improvement by increasing the proportion of solid particles in the soft matrix.

Keywords

• alsi12
• babbit b83s
• pos61 tin-lead solder
• induction surfacing
• structure
• transition layer
• adhesive properties
• x-ray spectral analysis
• friction coefficient
• wear resistance