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Post by Deleted on Oct 31, 2008 20:50:30 GMT
Just thought some of you guys might be interested in seeing an example of what people are talking about when they discuss the 'grain' in steel, or 'grain growth' of overheated or improperly normalized steel. This was sort of an accidental 'experiment' that happened over a few weeks, but the two pieces pictured pretty much speak for themselves. The steel on the left is a piece of hot cut rail anchor 1060 I sized down yesterday. The piece was heated to a medium orange and chiseled through in three heats, then quenched and 'snapped' over the anvil. The piece on the right is mystery steel rail road spike lol. probably 1030/1040 or so. For some reason this piece kept 'overheating' and blistering at a heat approaching orange. I finally quenched it and broke a piece off out of curiosity. It wasn't until yesterday when I hot cut the 1060 that the absolutely radical difference was apparent. I mean, I knew the spike grain was 'enlarged' and bad, and I'd seen good grain before...but never in a close enough time frame for direct comparison. As you can see the difference is very clear between the two, so I thought I'd share. Cris
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Post by brotherbanzai on Nov 1, 2008 0:22:23 GMT
Huh, the texture of the RR spike looks almost like a piece of pot metal.
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Post by Deleted on Nov 1, 2008 1:13:49 GMT
Huh, the texture of the RR spike looks almost like a piece of pot metal. Yeah I thought much the same. It's steel though (if you can call it that lol...I'd say it barely qualifies!). I normalized it a few times while forging yesterday and busted off another piece because it looked so wierd...much better. Cris
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Post by Matt993f.o.d on Nov 8, 2008 19:41:33 GMT
It would be nice to conduct a more controlled experiment to highlight under what conditions grain enlargement can occur.
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