Article ID Journal Published Year Pages File Type
1580285 Materials Science and Engineering: A 2009 9 Pages PDF
Abstract
The formation and phase transformation mechanism of η and σ phases in three experimental polycrystalline superalloys were studied. It was shown that a high (Ti + Al) content in the alloys would favor the formation of η and σ phases in the interdendritic region. Different as-cast microstructures resulted in different phase transformation processes during heat treatment and thermal exposure. Influence of η and σ phase on tensile properties had been investigated as well. The tensile properties of the alloys were sensitive to γ′ volume fraction of the alloys, as well as morphologies of η and σ phases in the interdendritic area. Formation of plate-like η phase had negative impact on the low and intermediate temperature tensile properties of the polycrystalline superalloy.
Related Topics
Physical Sciences and Engineering Materials Science Materials Science (General)
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