Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 159-167 |
| Number of pages | 9 |
| Journal | Materials Science and Engineering A |
| Volume | 743 |
| DOIs | |
| Publication status | Published - 16 Jan 2019 |
Bibliographical note
Funding Information:This study was supported by the KUSTAR-KAIST International Joint Research Project (N11180043) and MOTIE/KETEP project (No. 20171510101990) of the Republic of Korea. Financial support for three of the authors was provided by the BK-Plus program of the MSIP of the Republic of Korea.
Funding Information:
This study was supported by the KUSTAR-KAIST International Joint Research Project ( N11180043 ) and MOTIE/KETEP project (No. 20171510101990 ) of the Republic of Korea. Financial support for three of the authors was provided by the BK-Plus program of the MSIP of the Republic of Korea.
Publisher Copyright:
© 2018 Elsevier B.V.
Keywords
- Al-rich particles
- Cleavage fracture
- Embrittlement
- FeCrAl alloy
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering