400 °C aging embrittlement of FeCrAl alloys: Microstructure and fracture behavior

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 199
  • Download : 0
Two commercial advanced powder-metallurgical FeCrAl alloys with nominal composition of Fe-22Cr-6Al (APM) and Fe-21Cr-5Al-3Mo (APMT) were aged at 400 °C up to 4828 h. In the as-received condition, both alloys had similar amount of Al-rich particles, while there were more Si-rich particles in APMT. In the aged condition, APMT was more susceptible to the aging embrittlement than APM, showing a complete cleavage fracture in tensile tests. During aging, areal fraction and size of Si-rich particles were not affected for both alloys, but the growth of oxygen-free Al-rich particles was observed for APMT. Meanwhile, Fe-Cr phase separation was not observed in both alloys after 4828 h aging at 400 °C. Instead, fracture surface observation revealed that the severe aging embrittlement of APMT could be correlated to the growth of large Al-rich particles, which acted as crack initiation sites leading to the cleavage fracture.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2019-01
Language
English
Citation

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.743, pp.159 - 167

ISSN
0921-5093
DOI
10.1016/j.msea.2018.11.084
URI
http://hdl.handle.net/10203/248989
Appears in Collection
NE-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0