Abstract
The focus of this study is small crack initiation, growth
and arrest from small defects in quenched and tempered
steels. To study the initiation and growth threshold of
microcracks from small defects a specialised test method
was developed. Round bars were axially loaded at R = -1
and fatigue initiators were manufactured by drilling (Ø
50 µm) and Focused Ion Beam (FIB) milling (a = 10-50 µm).
The specimens were fatigued at the range of the smooth
specimen fatigue limit. The initiated microcracks were
monitored to observe crack initiation; growth and arrest.
The high correlation of the FIB small crack growth
results with inclusion test results indicates that using
a FIB notch to initiate small cracks is a good way to
test small crack growth in high strength steels.
Original language | English |
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Pages (from-to) | 154-158 |
Journal | International Journal of Fatigue |
Volume | 62 |
DOIs | |
Publication status | Published - 2014 |
MoE publication type | A1 Journal article-refereed |
Keywords
- defect
- focused ion beam
- initation
- small crack
- threshold