Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1580583 | Materials Science and Engineering: A | 2010 | 7 Pages |
Abstract
The amount of M23C6 from decomposed MC during long time ageing at 900 °C is much greater than at 1100 °C. The carbide particle can retard mobile dislocations shearing γⲠprecipitates, and secondary γⲠprecipitates vary limitedly so that the 900 °C/100 h stress rupture life reaches peak value. With increase of ageing times at 1100 °C, a large amount of fine spheroidal γⲠparticles precipitate among secondary γⲠprecipitates so that the 1000 °C yield strength of the alloy abnormally increases comparing to that with standard heat treatment. After exposure at 1100 °C, the dislocation networks at the interface of γâ²/γ are destroyed gradually and cannot hinder more dislocations cutting into γⲠparticles, which results in the decrease of stress rupture life. The room-temperature tensile deformation mechanisms of specimens after long-term exposure at 1100 °C are mainly controlled by dislocation glide and climb. It shows that ageing temperature has an important effect on deformation mechanism.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Yu Jinjiang, Lian Zhanwei, Chu Zhaokuang, Sun Xiaofeng, Guan Hengrong, Hu Zhuangqi,