A new method of fine grained casting for nickle-base superalloys

Determination of heat transfer coefficient and ceramic mold material parameters for alloy IN738LC investment castings

“…Liquidus and solidus temperature are in very good agreement with DTA measurements from Liu et al (1998) (see Table 4). On the other hand Chapman (2004) published 12 and 45 • C lower liquidus and solidus temperatures, respectively.…”

“…However, many material parameters of the alloy, the mold and the alloy/mold interface have to be known accurately. Liu et al (1998) measured the liquidus and solidus temperature for the alloy IN738LC and showed the interdependency of the melt temperature with grain size. Chapman et al (2008) measured physical properties of this alloy and of different ceramic mold materials.…”

The Influence of the Melt-Pouring Temperature and Inoculant Content on the Macro and Microstructure of the IN713C Ni-Based Superalloy

“…[19][20][21][22][23][24] The alloying elements react with CoAl 2 O 4 . As a result of the process on the surface of the shell mold, Co particles are formed that act as nucleation cites for heterogeneous crystallization of the c phase (q is the latent heat of the presented reactions): 100%) of the nucleation sites (Co) and the c phase equal only 1.5%.…”

“…In this temperature range, a uniform and relatively fine surface grain size is desired to promote fatigue properties and resistance to crack growth. [19][20][21][22][23] For this reason, in the presented work, castings were modified by adding the CoAl 2 O 4 inoculant to the prime coat of the shell mold. This technique of modification was chosen due to the ease of implementation, the acceptable cost, and satisfactory results (for thin-wall castings), in accordance with the requirements put forward by turbine parts purchasers.…”

“…The modification mechanism of the nickel superalloys with the use of the cobalt aluminate is widely discussed in the literature. [19][20][21][22][23][24] The alloying elements (e.g., Cr, C, Ti, and Al) react with CoAl 2 O 4 to form Co particles formed on the surface of the shell mold. The particles act as nucleation sites for the heterogeneous crystallization of the c phase.…”