کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
830255 | 1470352 | 2013 | 8 صفحه PDF | دانلود رایگان |
An added second solution heat treatment was conducted to investigate its effects on the microstructures and stress-rupture properties of GTD-111. The microstructures were analyzed by scanning electron microscope after each step of heat treatments. The stress-rupture life of GTD-111 dramatically increases from about 180 to 288 h at 871 °C/310 MPa after adding a second solution heat treatment. The added second solution heat treatment promoted the solution of γ–γ′ eutectic into γ matrix, and facilitated the nucleation and precipitate of the secondary γ′ particles. The distribution of γ′ phase becomes much denser, the width of γ matrix channel is also reduced, and the volume fraction of γ′ phase significantly increases from about 29.3% to 44.2%. The improved stress-rupture life is primarily due to the increased volume fraction of γ′ phase. The carbides mainly consist of MC and a small amount of M23C6, which may prevent the dislocation moving and/or grain boundary sliding, and further improve the stress-rupture properties of GTD-111.
► The second solution heat treatment promoted the solution of γ–γ′ eutectic into γ matrix.
► The volume fraction of γ′ increases significantly after adding the second solution heat treatment.
► The improved stress-rupture life is primarily due to the increased volume fraction of γ′ phase.
Journal: Materials & Design - Volume 45, March 2013, Pages 308–315