A Review of Rafting in Nickel-Based Single Crystal Superalloys
Nickel-based single crystal superalloys have been widely used in modern aircraft, which is related to its high temperature mechanical strength and creep properties. And the initial cubic γ′ precipitates start to coarsen directionally during high temperature creep, which results in the degradation of the mechanical properties, especially the creep properties. Therefore, it is essential to figure out the mechanism of directional coarsening during the period of high temperature creep. In this article, a broad review of rafting mechanism of nickel-based single crystal superalloys is provided. The major work of this critical review is to introduce several experiments and numerical simulations which are used to analyze the evolution of rafting. For three different numerical simulations, their performance, advantage and disadvantage are discussed in detail. Through methods above, the effect on creep properties is summarized.
Prof. Haider F. Abdul Amir
Z. Y. Yu et al., "A Review of Rafting in Nickel-Based Single Crystal Superalloys", Solid State Phenomena, Vol. 263, pp. 41-49, 2017