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

Hyunmyung Kim, Gokul Obulan Subramanian, Chaewon Kim, Hun Jang, Changheui Jang

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

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 languageEnglish
Pages (from-to)159-167
Number of pages9
JournalMaterials Science and Engineering A
Volume743
DOIs
Publication statusPublished - 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

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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