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Lab talk, the good, the bad, and the ugly
Metal
Hairline fractures on devesting
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<blockquote data-quote="ztech" data-source="post: 109742" data-attributes="member: 3022"><p>If the cracks edges are jagged and the edges look like sand granules the most likely cause is a cooling tear. It would usually occur with quenching but if you have highly variable thickness it can occur also. Rounded or smooth areas in the tear would indicate a burnout or alloy heating problem. Without photos I couldn't venture a guess as to which but. As for the burnout, I have used the short burnout on all sizes of rings with wax patterns using with Fujivest II and have never had a problem but the shortest time I have ventured is 35 min.</p></blockquote><p></p>
[QUOTE="ztech, post: 109742, member: 3022"] If the cracks edges are jagged and the edges look like sand granules the most likely cause is a cooling tear. It would usually occur with quenching but if you have highly variable thickness it can occur also. Rounded or smooth areas in the tear would indicate a burnout or alloy heating problem. Without photos I couldn't venture a guess as to which but. As for the burnout, I have used the short burnout on all sizes of rings with wax patterns using with Fujivest II and have never had a problem but the shortest time I have ventured is 35 min. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
Hairline fractures on devesting
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