Forging Breakup - M50 Tool / Bearing Steel
Forging Breakup - M50 Tool / Bearing Steel
(OP)
Hi All,
I was wondering if anyone can help me understand a problem I'm experiencing. I'm trying to produce a small scale hammer forging from M50 and having trouble with break-up. I know that these grades can have issue with liquation causing breakup but the temperature we're using (1120°C) is the same temperature the bar stock was forged at, so I can't see why it would be an issue now if it wasn't when originally forged. It has been spheroidised since then - could this lower the forging temperature enevolope? As far as I know, this is within recommended forging temperature ranges, if a little towards the top end.
Thanks for amy help.
I was wondering if anyone can help me understand a problem I'm experiencing. I'm trying to produce a small scale hammer forging from M50 and having trouble with break-up. I know that these grades can have issue with liquation causing breakup but the temperature we're using (1120°C) is the same temperature the bar stock was forged at, so I can't see why it would be an issue now if it wasn't when originally forged. It has been spheroidised since then - could this lower the forging temperature enevolope? As far as I know, this is within recommended forging temperature ranges, if a little towards the top end.
Thanks for amy help.





RE: Forging Breakup - M50 Tool / Bearing Steel
RE: Forging Breakup - M50 Tool / Bearing Steel
www.EngineeringMetallurgy.com
RE: Forging Breakup - M50 Tool / Bearing Steel
"Preheat at 1400-1500°F (760-816°C) and hold until uniformly heated; then heat rapidly to 2025-2100°F (1107-1149°C) and again hold until parts are uniformly heated. Do not forge below 1700°F(927°C). Parts should be slow cooled after forging by furnace cooling or by burying in an insulating medium. A full annealing treatment should always follow forging.
Here's Latrobe's datasheet for M50.
As btrueblood pointed out, the problem may be due to the small preform mass losing too much heat at its extremities and hot tearing. Also, you mentioned this is a hammer forging operation on a "small scale". Is the forging process performed manually or is it automated?
Hope that helps.
Terry