Click for larger image Above is a distinct example of decohesion along a grain boundary. (Uhl Volume II, 134)
Click for larger image
Above is a distinct example of decohesion along a grain boundary.
(Uhl Volume II, 134)
Stainless Steel
sigmats=195,000 psi
Click for larger image
The above fractograph show hydrogen embrittlement. (Uhl VolumeI, 289)
Stainless Steel
sigmats=195,000 psi
Specimen broke under high cycle fatigue (Nf=3.13*105,
Smean=39,5000 psi).
Click for larger image
Decohesive rupture occured along the grain boundary. (Bhattacharyya,70-12)
C-Mn Steel
sigmats=76,000 psi
Click for larger image
Above is an example of stress corrosion cracking. (Nishida, 206)
Low Carbon Steel
sigmats=43,000 psi
Click for larger image
There is a thin layer of oxide on the above specimen. (Uhl VolumeI, 169)
Gray Cast Iron (ASTM 247)
sigmats=33,000 psi
Click for larger image
The white "fuzz" are sulfate deposits. (Uhl VolumeI, 205)
Submitted by Ron Halahan
Virginia Tech Materials Science and Engineering
http://www.eng.vt.edu/eng/materials/classes/MSE2094_NoteBook/97ClassProj/exper/halahan/www/cohesive.html
Last updated: 4/27/97