Extra-long creep rupture life of Alleima 3R60™ (316/316L) stainless steel

Alleima 3R60 (TM) is an AISI 316/316 L type of stainless steel. This alloy shows extra-long creep lives. At 700 degrees C with an applied stress of 45 MPa, the specimen broke first after 240 131 hours, a 140% longer creep life than the predicted. The reasons have been studied using SEM/EDS, EBSD, EC...

Full description

Saved in:
Bibliographic Details
Published inMaterials at high temperatures Vol. 41; no. 1; p. 169
Main Authors Chai, Guocai, Lautrup, L., Gustavsson, F.
Format Journal Article
LanguageEnglish
Published 2024
Subjects
precipitates
microstructures
Creep
fine grain size
316/316L austenitic stainless steel
Online AccessGet full text

Cover

More Information
Summary:Alleima 3R60 (TM) is an AISI 316/316 L type of stainless steel. This alloy shows extra-long creep lives. At 700 degrees C with an applied stress of 45 MPa, the specimen broke first after 240 131 hours, a 140% longer creep life than the predicted. The reasons have been studied using SEM/EDS, EBSD, ECCI and TEM. Two unexpected phenomena have been observed. One is the presence of homogeneously dispersed small Mo2Fe4CrSi(Ni-0.5)f063type of precipitates in the matrix. According to the thermodynamic calculation, this phase should not form in this alloy at 700 degrees C. The other is the fine grains formed in the matrix during the creep-testing at 700 degrees C for such an extra-long time. It is believed that both small precipitates and fine grain size contribute to this extra-long creep life of the steel. With the microstructural study and thermodynamic simulation, the mechanisms to form precipitates and fine grains have been discussed.
ISSN:1878-6413
0960-3409
DOI:10.1080/09603409.2023.2283989