Microstructural evolution in T24, a modified 2(1/4)Cr-1Mo steel during creep after different heat treatments.
2009
Abstract
A crept modified 2(1/4)Cr-1Mo steel (T24) was investigated in order to understand differences in creep behavior which are related to different cooling rates after austenitizing (air-cooling and water quenching). Two 823 K creep stress levels were compared, 150 MPa (rupture times of order of: 50 000 h) and 200 MPa (rupture times of order of: 500 h).
The air cooled specimens showed lower rupture times at 200 MPa (short term creep conditions) while the differences in rupture times were not pronounced at 150 MPa (long term creep conditions).