L-605 cracking

[FWMengineering]

What is the major cause of cracking in L-605 alloy?
We have struggled with problem on and off for years and never figured it out.
Thank you

 

[metengr]

FWMengineering;
Can you provide some additional background information as to use of this material in service??? What type of cracking???

 

[FWMengineering]

It is in wire form going for straight cut bar.
The major amount of cracking has been of a stress corrosion type making our cleaning suspect.
However we also trying to anneal with a vacuum furnace and the ramp up to temperature is slow
and the quench is on boarder line of being to slow.
Thank you

 

[metengr]

What is the original heat treatment condition for your processing? This is a cobalt-based material and from the literature I have seen when exposed to intermediate temperatures can result in loss of ductility.

 

[FWMengineering]

Recommended 2200F air anneal 1 to 2 hours water quench.
We are trying to use a 2 bar vac furnace with helium argon mix