Simultaneous enhancement of strength and fatigue crack growth behavior of nanocrystalline steels by annealing

Nanocrystalline materials tend to have an inferior fatigue crack-growth behavior, compared to coarser-grained counterparts, due to the loss of crack-closure effects. Strategies to mitigate this effect are widely unknown as grain-refinement changes the strength, however, often also the fracture-mode...

Full description

Saved in:
Bibliographic Details
Published in:Scripta materialia 2017-10, Vol.139, p.39-43
Main Authors: Leitner, Thomas, Pillmeier, Simon, Kormout, Karoline S., Pippan, Reinhard, Hohenwarter, Anton
Format: Article
Language:English
Subjects:
Austenitic steels
Fatigue crack growth
High pressure torsion
Nanocrystalline materials
Severe plastic deformation
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:Nanocrystalline materials tend to have an inferior fatigue crack-growth behavior, compared to coarser-grained counterparts, due to the loss of crack-closure effects. Strategies to mitigate this effect are widely unknown as grain-refinement changes the strength, however, often also the fracture-mode and cyclic material behavior so that the effect of individual parameters is difficult to discriminate. To address this issue, the fatigue crack-growth behavior of a nanocrystalline austenitic-steel (316L) in two conditions with different strength but comparable grain-size is investigated. The increased strength level, realized by an annealing treatment, leads to an improvement of the fatigue crack-growth behavior. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2017.05.051