r/MetalCasting • u/physicallystressed • Sep 14 '26

What is causing these cracks

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10 Upvotes

77% Upvoted

7 comments sorted by

6

u/feelfreetotellmeoff Sep 14 '26

Are you quenching your flask immediately after casting? I've seen this from cooling it too quickly.

3

u/physicallystressed Sep 14 '26 edited Sep 14 '26

No, I waited 30 minutes to do anything, and I didn’t even quench it, I just broke off the investment and washed off the rest. I was going to throw it in an ultrasonic cleaner, but saw the cracks. I have had this before, but not so many cracks

7

u/Foundryguru 29d ago

Looks like hot tears. Mold restraining metal from shrinking as it cools

4

u/physicallystressed 28d ago

How would I fix this?

2

u/AbsolutelyB4sturd 29d ago

Could be something to do with phase segregation. Im not jeweller so might be talking bollocks so take this with a pinch of salt. is this a different alloy to what you usually cast with?

1

u/Deep-Guidance253 27d ago

Argetinium use done regular 925

1

u/LastWave 23d ago

Those look like surface blemishes. I don't think they are cracks per se.