IFMASS10

190

Since SZD measurements are not straightforward, but rather have to be calculated

from indirect measurements, the described methodology used in literature is verified for

the specimens of HSLA steels.

Condition of the crack tip is also significant for fatigue fracture, as crack propagation

rate depends on whether there are second phase particles of impurities ahead of a crack

tip. These particles accelerate the crack propagation and influencing the spacing between

striations, thus affecting the appearance of fracture surface.

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