Effect of selected heat treatment parameters of AK9 silumin on its tensile strength

Development of modern techniques creates supply of better and better structural materials having higher strength. Light metals and their alloys are more and more often used for metal structures, whereas aluminium and its alloys are the most widespread among them. Mechanical and technological properties of castings made from Al-Si alloys depend most of all on properly performed process of melting and casting, design of casting and mould, as well as heat treatment. The paper describes implementation of TDA method to determination of solution heat treatment and ageing treatment temperatures of AK9 silumin. Investigated alloy was melted in electric resistance furnace. Next, the alloy had undergone processes of refining and modification. Run of crystallization process is presented with use of thermal derivative analysis (TDA). That method was also implemented to determination of heat treatments temperature's range of the alloy. Obtained results relate to registered with TDA method solution heat treatment curves, light microscopy, strength tests and determination of an effect of selected parameters of the heat treatment on tensile strength Rm of investigated alloy. On base of performed tests of heat treated alloy there was determined an effect of selected parameters on obtained tensile strength Rm. The tests were performed in laboratory conditions, and therefore what is why verification in industrial environment is needed.