Microstructure-Properties: I Fracture Toughness - Materials Science ...
Microstructure-Properties: I Fracture Toughness - Materials Science ...
Microstructure-Properties: I Fracture Toughness - Materials Science ...
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9<br />
Objective<br />
Overview<br />
Crack<br />
Minimztn.<br />
Energy<br />
Absrptin.<br />
(a) Minimize/eliminate<br />
Minimize/ eliminate cracks<br />
• How do we eliminate cracks?<br />
• First, consider the sources of cracks:<br />
- in metals, voids from solidification are deleterious<br />
(especially in fatigue), so minimizing gas content<br />
during solidification helps (Metals Processing!).<br />
- rough surfaces (e.g. from machining) can be<br />
made smooth.<br />
- also in metals, large, poorly bonded (to the<br />
matrix) second phase particles are deleterious,<br />
e.g. oxide particles. Therefore removal of<br />
interstitials (O, N, C, S) from steel melts (or Fe &<br />
Si from Al) is important because they tend to react<br />
with the base metal to form brittle inclusions (as in,<br />
e.g. clean steel technology).
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