The Control of Grain Shape and Its Effect on the Properties of Cast Components for High-Temperature and High-Stress Applications 660055

A precision casting technique based on directional solidification, which imparts ductility and thermal shock resistance to high-temperature, creep-resistant, nickel-base superalloys has been developed at Pratt & Whitney Aircraft. The desired improvement in physical properties is achieved by controlling the grain solidification process so as to eliminate transverse grain boundaries. Furthermore, the feasibility of producing parts using this “directional solidification process” has been demonstrated in both experimental and production foundry facilities.
To establish the worth of this new casting process, identically-shaped parts were fabricated from the same nickel-base superalloy, Mar M-200, following either the “controlled conventional process” or the “directional solidification process.” The parts were then subjected to identical laboratory physical tests and accelerated endurance tests in Pratt & Whitney Aircraft experimental engines. The results obtained from these tests are described.


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