Fracture behavior of 9Cr nanostructured ferritic alloy with improved fracture toughness

Nanostructured ferritic alloys (NFAs) have been considered as primary candidate materials for both fission and fusion reactors because of their excellent creep and irradiation resistances. It has been shown that high temperature fracture toughness could be significantly improved by appropriate therm...

Full description

Saved in:
Bibliographic Details
Published in:Journal of nuclear materials 2014-06, Vol.449 (1-3), p.39-48
Main Authors: Byun, Thak Sang, Yoon, Ji Hyun, Wee, Sung Hun, Hoelzer, David T., Maloy, Stuart A.
Format: Article
Language:English
Subjects:
Chromium steels
Creep (materials)
Fracture mechanics
Fracture surfaces
Fracture toughness
Nanostructure
Nuclear engineering
Optimization
Thermomechanical treatment
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Nanostructured ferritic alloys (NFAs) have been considered as primary candidate materials for both fission and fusion reactors because of their excellent creep and irradiation resistances. It has been shown that high temperature fracture toughness could be significantly improved by appropriate thermo-mechanical treatments (TMTs). This article focuses on the static fracture behaviors of newly developed 9Cr NFAs with improved toughness. Optimal TMTs resulted in high fracture toughness at room temperature (>250MPa√m) and in retaining higher than 100MPa√m over a wide temperature range of 22–700°C. Significant differences were found in fracture surfaces and fracture resistance (J–R) curves after different TMTs. Unique fracture surface features such as shallow nanoscale facets decorated with shear lips and flake-like grains were observed in high toughness specimens.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2014.03.007