Help! > Mistakes, muckups, and dangerous behaviour
Can this part be saved? Internal stress
matthew-s:
Well, that was far less drama than I anticipated. Bending it worked. I got it within 0.002. I’ll take it, especially for this part.
For the curious, I added a picture from Kozos book, showing how he suggests the part be made.
There was mixed info on the internet about stress relieving 303. And whether that is the same as a full anneal. One source implied stress relief can be done at broiler temperatures. Others made me think that person confused F and C and perhaps I need to approach 2,000F.
I guess we’ll find if a kitchen oven soak helps when I slice the second radius rod off the block!
I did purchase what was described as annealed 303. I was hoping that would prevent this. Oh well. Forward, march!
Kim:
Glad the bending went well, Matt! That's great! :ThumbsUp: :popcorn:
So nice not to lose all that work for such a simple thing!
Interestingly, Blondihacks posted her video of making this part just yesterday. She used Kozo's method: https://www.youtube.com/watch?v=JLyd7DCfT7Q&t=1s
Great work, Matt, and good luck with the next one!
Kim
crueby:
Stress relieving and annealing are not the same thing. Annealing softens the metal, stress relieving relaxes the rolling stresses from the manufacturing processes. Annealed metal can still have stresses.
rklopp:
--- Quote from: crueby on February 09, 2025, 04:35:28 PM ---Stress relieving and annealing are not the same thing. Annealing softens the metal, stress relieving relaxes the rolling stresses from the manufacturing processes. Annealed metal can still have stresses.
--- End quote ---
No, annealed metal should have less residual stress than stress-relieved metal. Annealing is done at a higher temperature and should be cooled slowly enough to avoid thermal stresses.
crueby:
--- Quote from: rklopp on February 09, 2025, 11:05:34 PM ---
--- Quote from: crueby on February 09, 2025, 04:35:28 PM ---Stress relieving and annealing are not the same thing. Annealing softens the metal, stress relieving relaxes the rolling stresses from the manufacturing processes. Annealed metal can still have stresses.
--- End quote ---
No, annealed metal should have less residual stress than stress-relieved metal. Annealing is done at a higher temperature and should be cooled slowly enough to avoid thermal stresses.
--- End quote ---
Annealing can be done quickly. Stress relieving takes a lot longer. And a lot of the stresses causing warps when cut are from working the bar, not just from thermal stress. Things vary a lot with the alloy too, the recipes for stress relieving and annealing vary a lot too, not just a simple heat and cool for all metals. My experience with annealed metal is that it still has stresses and still warps when cut. The 303 in the part shown in this thread was annealed 303, and it warped.
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