2012•Heat treatment of metalsRequires access
Effect of heat treatment on microstructure of G3 alloy
Feng Guanghai
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Abstract
Effect of heat treatment on microstructure of G3 alloy was investigated by optical microscope,transmission electron microscope and scanning electron microscope.The results show that the average grain size of G3 alloy increases gradually from 5.14 grade to 4.18 grade with the increase of solution temperature at the 1120-1180 ℃.The type and distribution patterns of precipitate phase of the alloy are significantly different after aging at different temperature.Grain boundary precipitates of G3 alloy is M23C6 phase in net-shape,and intragranular fine precipitates are TiN and σ which some time compound precipitate after aging at 700 ℃ for 50 h.After aging at 800 ℃ for 50 h,the grain boundary precipitates of G3 alloy is still M23C6,but intragranular precipitates is M6C particles likely lamellar shape.Aging at 900 ℃ for 50 h,the grain boundary precipitates of G3 alloy is M6C but not M23C6,and there are a great number of nanoscale second phase particles in grain interacting with dislocations.