کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1574890 | 1514733 | 2014 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The microstructure of heat-treated nickel-based superalloy 718Plus The microstructure of heat-treated nickel-based superalloy 718Plus](/preview/png/1574890.png)
The microstructure of thermally aged nickel-based 718Plus superalloy is investigated using transmission electron microscopy (TEM). Solution annealing at 980 °C for 30 min is followed by either the standard quenching to room temperature or quenching directly to 788 °C, before isothermal aging at 788 °C for four hours. Micro-hardness and yield strength are measured to compare the effects of the two variations. The size and phase fraction of γ′ precipitates are measured using dark-field TEM and related to the hardness and yield strength through a theoretical model based on coherency and antiphase boundary effects. A population of very small sub-precipitates is observed and the larger γ′ precipitates are investigated in detail using high resolution scanning TEM to reveal information about the chemical ordering.
Journal: Materials Science and Engineering: A - Volume 610, 29 July 2014, Pages 39–45