奥氏体不锈钢蠕变微观组织研究

Creep Microstructures of Austenite Stainless Steels

对316LN不锈钢进行蠕变试验。在350和600℃条件下,在20~150 MPa的应力范围内老化500~2 000 h,蠕变后试样的显微组织通过光学显微镜(OM)和透射电子显微镜(TEM)观测。结果表明,在蠕变过程中,随着温度的升高以及时间的延长,基体的层错能提高,扩展位错逐渐变窄并出现了位错对。

Creeping experiments were carried out on the stainless steels 316LN. The steels were aged for 500-2 000 h in the stress range of 20-150 MPa at 350℃ and 600℃, and the microstmcW.res of the samples after creep were observed by optical microscope （OM） and transmission electron microscope （TEM）. The results show that stacking faulting energy of the matrix increases with the increase of the creep temperature and time during the creep process, and the extended dislocations gradually become narrow and dislocation pairs appear.