Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2016 - zeszyt 5

Influence of variable casting wall thickness and shell mold material and its thermal properties on secondary dendrite arm spacing in IN 713C superalloy castings

10.15199/28.2016.5.2

Agnieszka Szczotok

nr katalogowy: 101849
10.15199/28.2016.5.2

1. INTRODUCTION Different casting parameters can change the microstructure and mechanical properties of nickel-based superalloys. Kostić, Golubović, and Valčić [1] described how temperature gradient, crystal growth rate, and concentration of the alloying elements influence the microstructure and physical properties of the material. Polycrystalline and single-crystal nickel-based superalloy castings exhibit a dendritic structure that is the most common growth morphology during the solidification of metals and alloys. Each dendrite consists of primary arms (PDAs), secondary arms (SDAs), and even tertiary arms (TDAs). The secondary dendrite arm spacing (SDAS), which is defined as the distance between the protruding adjacent secondary arms of a dendrite (Fig. 1), has been recently used to describe the metallurgical structure of cast materials. It is well known that variations in the cooling rates during solidification can give rise to the various morphologies of the as-cast structures; these then lead to variations in their mechanical properties. Values of primary dendrite arm spacings (PDAS) and secondary dendrite arm spacings (SDAS) under controlled conditions can be used to predict the microstructure and properties of the castings and to develop a theoretical foundation for the control of microstructure and properties and the optimization of the industrial processing parameters. This has motivated many studies of PDAS and SDAS in dendritic structures [2÷6]. Along with the other microstructural parameters, PDAS and SDAS have a strong effect on the mechanical properties of Ni-based superalloys [5]. Over the past several decades, extensive experimental studies of PDAS have been carried out and a number of theoretical models have been developed [7÷11]. The relationships between the solidification processing parameters and PDAS have been established experimentally and theoretically [12]. Numerous studies of SDAS and dendrite growth [...]

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