Directionally Solidified and Single-Crystal Superalloys

Abstract

Directionally solidified (DS) and single-crystal (SX) superalloys and process technology are contributing to significant advances in turbine engine efficiency and durability. These gains are expected to arise from the development of higher creep strength and improved oxidation-resistant SX alloy compositions as well as from the development of SX casting and fabrication technology to utilize advanced transpiration-cooling schemes. This article provides a detailed discussion on the chemistry and castability of first- and second-generation DS and SX superalloys. It summarizes the chemistry modifications applied to MAR-M 247 to develop CMSX-2 with respect to function and objectives. The article also lists the nominal compositions of first- and second-generation DS and SX superalloys.

Grain Competition Mechanism of a Ni₃Al-Based Single Crystal Superalloy IC6SX

“…Grain selection method was universally applied for preparing single crystal. Expecially, spiral grain selection method was the most basic in the process of preparing single crystal superalloy blade and it also has been widely used in producing all kinds of single crystal material [1,2]. The growth regularity of the different alloy system has been studied by different methods, and the results suggested thatgrain competitive growth and eliminationmechanism was different [3][4][5][6][7].…”