Microvoid Coalescence or Dimple Fracture

High Carbon Steel
sigmats=74,000 psi
Specimen broke in tension.
Click for larger image
Here is a large picture of an elongated dimple. (Bhattacharyya, 101-19b)

AISI 10B21 Steel
sigmats=218,000 psi
Specimen broken in tension
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The microvoid coalesence can be seen in the upper right corner. (Bhattacharyya, 2-9)

Aluminum 2024 Alloy
sigmats=66,000 psi
Specimen broken in tension
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As before, several areas of microvoids can be seen. (Bhattacharyya, 102-10)

Titanium Alloy
sigmats=153,00
Specimen broken in high cycle fatigue.
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Equiaxed and elongated dimples are seen above. (Bhattacharyya,137-15)

Nitralloy 135M
sigmats=146,000 psi
Specimen broken in tension
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Several areas of microvoid coalesence is seen in this picture. (Bhattacharyya, 52-17)


More pictures and information on this topic



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Submitted by Ron Halahan

Virginia Tech Materials Science and Engineering

http://www.eng.vt.edu/eng/materials/classes/MSE2094_NoteBook/97ClassProj/exper/halahan/www/microvd.html

Last updated: 4/25/97