MAUI-The power is being applied to a block of stainless steel. The parts are held against this block with a rubber hinged arm. When we tried each lot with separate fixtures we received the same result as putting all the lots on the same fixture. To the best of our knowledge our heat treatment...
Maui- I am investigating your current questions about the SEM images. I wanted to provide a paper that I located today which states that in aluminum the preferential etching of the grain boundaries increases with increasing Zn content. I will be sending out samples for composition testing as...
Maui-I cannot give out the percentages of the metal as it is patented but I can say that there are high concentrations of PD and Ag and low concentrations of Au, Pt and Cu and a minute concentration of Zn. Does this change the type of precipitate and therefore the needed test?
EdStainless- My...
Maui- In order to eliminate our process from contributing to the outcome I placed all the lots in the same fixture and etched them at the same time. The results were the same as when we etched them lot by lot. The preparatory procedures are the same with each lot. In order to further verify that...
Maui-We have maintained the same process for all lots that are etched. We are etching away a large amount of material so we should be free of any surface contamination. Is there a test that could accurately determine the precipitation along the grain boundary?
Arunmrao- We sometimes etch the...
This is the picture of the grain boundary etching.http://files.engineering.com/getfile.aspx?folder=43b3b5af-22d6-4dae-a2d7-726567dfc708&file=Etched_Grain_Boundries.jpg
We are using a cyanide based electrochemical etching process to etch tapered tips on a precious metal alloy wire and have discovered that each material lot behaves differently with the same etch process. These material lots will preferentially etch the grains in one lot and varying levels of the...
@metengr Thank you for the pdf, it was helpful.
@tbuelna Thank you for the information. I do not currently have the ability to heat treat an annealed form of the BECU after bending.
@kumkumvijay Thank you for the information.
I am using a tempered stress relieved beryllium copper which has an ultimate strength of 200ksi. I would like to heat the parts to 400 degrees Fahrenheit for a maximum of eight hours (1 work shift) so that I may bend the parts without cracking. Is this temperature going to affect the physical...
