LCB heat treatment for reduced UTS
LCB heat treatment for reduced UTS
(OP)
We are a commercial heat treat company. One of our customers occasionally has us process A352/LCB castings (with which we have very limited experience) and has complained that the UTS after our heat treatment is too high (around 92 ksi, I think, with a requirement of 90 ksi max - no idea what the minimum is). We were told "all the other test results are good". Our current process (I have no idea how it was originally set up) is
1650°F, oil quench
Temper 1300°F, cool to 1100°F, oil quench
Any thoughts on reducing the UTS without significantly adversely affecting the other properties? We have the capability for high-pressure gas quench, if doing that instead of the oil quench would help.
Also, any idea if the cool to 1100° after the temper or the oil quench after the temper have any purpose?
1650°F, oil quench
Temper 1300°F, cool to 1100°F, oil quench
Any thoughts on reducing the UTS without significantly adversely affecting the other properties? We have the capability for high-pressure gas quench, if doing that instead of the oil quench would help.
Also, any idea if the cool to 1100° after the temper or the oil quench after the temper have any purpose?





RE: LCB heat treatment for reduced UTS
RE: LCB heat treatment for reduced UTS
A commercial heat treater getting involved for this alloy, is quite a challenge . I would not stick my neck on the deliverables, for the foundry knows best, all that might have gone wrong.
http://www.eng-tips.com/search.cfm?pid=330&act...
"Even,if you are a minority of one, truth is the truth."
Mahatma Gandhi.
RE: LCB heat treatment for reduced UTS
RE: LCB heat treatment for reduced UTS
RE: LCB heat treatment for reduced UTS
Thank you for all the responses, it was very helpful in understanding this material and our options for processing it, and it's great that both us and our customer benefit from the process changes!
RE: LCB heat treatment for reduced UTS