The structure of connection of the AlSi5 – HS6-5-2 compound casting obtained by alphinising
Journal Title: Archiwum Odlewnictwa - Year 2011, Vol 11, Issue 3
Abstract
The paper presents results of the analysis of the alphinising coat connection structure of the AlSi5 silumin – high speed steel HS6-5-2 compound casting. The alphinising coat was made in the AlSi5 silumin bath with temperature t = 750±5°C, insert hold time was τ = 180 sec. The insert with the coat was transferred to a metal mould and then AlSi5 was poured. This way a silumin AlSi5 – steel HS6-5-2 com-pound casting was obtained. The connection between silumin and steel is diffuse and is formed by two layers with a different phase struc-ture. The first layer from the mould “g1`p” is formed by phase AlFe which contains constituent alloy additions of HS6-5-2 steel, namely W, Mo, V, Cr and Si. The other layer, “g1``p” of intermetallic phases AlFeWMoCrSi, crystallises on it. In the silumin area of the compound casting, adjacent to the diffuse layer, occur randomly arranged plate and wall intermetallic phases AlFeWMoCrSi. Both in the intermediate layer and in adjacent silumin, and also in unbounded precipitates of phase AlFeWMoCrSi are present carbides which are the constituent phase of HS6-5-2 steel. Additionally, in the paper are presented results of analyses of the influence of: time “τp” from removal of the insert from the alphinising bath until pouring silumin on it and preheating temperature of the metal mould “t2.0” on the microstructure and quality of the obtained connection. It has been found that in order to obtain a proper connection, time “τp” should not exceed a certain critical value, while temperature “t2.0” has considerable influence on the size of phase α dendrites of the compound casting silumin.
Authors and Affiliations
T. Szymczak
Keywords
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