Photos from Dan's GH 20

[edgarspencer]

I am "curious" as to the origin of these linear striations. They appear to begin at about the forward portion of the rupture, and look as though something forced it's way with enough force to dig into the wall.

[Cold Spring]

Originally Posted by edgarspencer

I am "curious" as to the origin of these linear striations. They appear to begin at about the forward portion of the rupture, and look as though something forced it's way with enough force to dig into the wall.

Thanks Edgar for posting a macro pic. I had the same observation when I first saw the pic but didn't get around to doing a macro. That's still a question mark for me.

[Steiner]

Originally Posted by edgarspencer

I am "curious" as to the origin of these linear striations. They appear to begin at about the forward portion of the rupture, and look as though something forced it's way with enough force to dig into the wall.

I took some more photos for your review. I will post in bunches.
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[Steiner]

Originally Posted by edgarspencer

I am "curious" as to the origin of these linear striations. They appear to begin at about the forward portion of the rupture, and look as though something forced it's way with enough force to dig into the wall.

More photos
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IMG-7931 (1).jpg

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[Steiner]

Originally Posted by edgarspencer

I am "curious" as to the origin of these linear striations. They appear to begin at about the forward portion of the rupture, and look as though something forced it's way with enough force to dig into the wall.

I wiped the inside of the barrel with Hoppe's (does anything in the world smell better than Hoppe's #9?) and took a few more. BTW, The inside of the barrel feels a smooth as a baby's butt.
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[edgarspencer]

I've forgotten more than I remember in years of testing metallurgy, but the first thing I was taught was to only let the science do the talking. However, that said, the 3rd and 4th pictures of post #25 are very telling.
Eyeballs are no replacement for a scanning electron microscope, but I think it's safe to say the rupture shows great ductility of the steel and I "feel" there was no issue with the steel, and it's heat treatment. The tear at the breach end of the rupture keeps telling me there was a solid obstruction at, or just fwd of the rupture. Damn, but those striations................

[Steiner]

Originally Posted by edgarspencer

I am "curious" as to the origin of these linear striations. They appear to begin at about the forward portion of the rupture, and look as though something forced it's way with enough force to dig into the wall.

A couple more pics of something I hadn't noticed before. This appears to be a split initiated from the outside and is not percetible by sight or touch on the inside.
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