It would have to be Austenitic to want to repair before Q&T, doing that in Carbon or low alloy steel would be silly.
It is really important to know the grade, it might be delayed cracking on weld repairs, it's not common on base material unless it's an HSLA (HY80 etc). If its a recurring...
Normalise at 950C for an hour per inch, air cool - don't quench it, it will crack - then temper at around 620C for an hour per inch. You should get balanced properties from that. Feel free to raise or lower the tempering temperature to raise or lower yield stress
Well, it depends what you mean by "have a 26% Chromium content". It could be that you are analysing what is left over after severe corrosion, which is likely to be regions of higher Chromium content. It could also be your analysis technique, or it could be that you have sampled a spot of sigma...
In answer to your original question, the best ceramic shelling material currently used commercially is a full alumina system. It costs an arm and a leg, though, and most places will settle quite happily for a zircon-based prime coat followed by as few layers as they can get away with of...
There is a fair point raised that when designing castings, we tend to avoid sharp corners, which act as stress raisers. In addition to this, many cast components (especially investment cast ones) can be used in the as-cast condition, avoiding finishing operations which can create crack...
How about hacking in a notch with a carbide cutter and then hitting it really hard with a hammer. Unconventional, I know, but it's how I used to section white iron before grinding.
I'm more than aware how the process works, thank you.
Assuming that the method of knock off is not "crack the parts with a hammer" there is rarely any distortion during the process. Most people have the good sense to hit the runner instead, and certainly not to tumble off delicate parts...
It's unlikely to be the shell, you would see finning/runout if the shell bent during cast.
Depending on the part geometry, it is likely to be either wax deformation, which is easily solvable by putting in dimensional checks in wax; improper allowances for change of shape/size between wax and...
Are you sure you have Ni and Fe the right way around? Or swap Fe and Co and it looks like F75.
If that is a steel, it would have to be made to order by a specialist alloy supplier, it doesn't seem to fit any of the international specs.
You'd need extra precautions for vapours, especially ones that could attack steel. Typically you would need respiratory protection in addition to extraction
Am I wrong in thinking that the Nickel content of a 304 is higher than 18/8? In my experience, 18/8, 17/4, 15/5 etc refers to chromium/nickel. Since 304 typically has at least 10% nickel, wouldn't this make it more of an 18/10?
