2013•Cailiao rechuli xuebaoRequires access
Effect of heat treatment on microstructure and mechanical properties of GH690-Re alloy
Yong Long Peng
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Abstract
Effect of heat treatment on microstructure and mechanical properties of GH690-Re alloy were investigated by optical microscope,scanning electron microscopy(SEM) and tensile test.The results show that the microstructure has been coarsened after heat treatment compared with that of the hot-rolled alloy.The optimal heat treatment process is solid solution treatment at 1050 ℃ for 45 min and then aging at 720 ℃ for 9 h.The microstructure of the heat-treated alloy is single-phase austenite matrix with γ' precipitates and its grain size is uniform,and the tensile strength and yield strength of the studied alloy are 655 MPa and 300 MPa at room temperature,respectively.The high strength of the alloy mainly comes from the precipitatation strengthening of γ' phase precipitated from oversaturated solid solution during aging.