glj1017
Materials
- Sep 2, 2015
- 3
Q&T SAE 1085 on a belt furnace. Been getting non-resolvable pearlite in the as-quenched structure.
Some details:
Part is 0.5" OD x 3.5" L.
Pic shown is core at high mag, pearlite starts around mid radius. Cycle: Soak at 1550F for 1 hour then quench in 130F oil
Have been using same oil type for a decade, cooling curve from sample testing hasn't changed in last ~ 2years of records. Have recharged pit with new oil.
Confirmed agitation mixer motor quench & circulating pump is functioning properly. Trialed increasing agitation.
Parts run single layer on belt, well below furnace max thruput rating defined by OEM
Confirmed no leaks at quench chute and rebricked discharge end eliminating any potential hang ups.
No plugs in oil cascade at end of belt.
Run smaller, higher alloy parts and get full martensite.
Ideas?
Some details:
Part is 0.5" OD x 3.5" L.
Pic shown is core at high mag, pearlite starts around mid radius. Cycle: Soak at 1550F for 1 hour then quench in 130F oil
Have been using same oil type for a decade, cooling curve from sample testing hasn't changed in last ~ 2years of records. Have recharged pit with new oil.
Confirmed agitation mixer motor quench & circulating pump is functioning properly. Trialed increasing agitation.
Parts run single layer on belt, well below furnace max thruput rating defined by OEM
Confirmed no leaks at quench chute and rebricked discharge end eliminating any potential hang ups.
No plugs in oil cascade at end of belt.
Run smaller, higher alloy parts and get full martensite.
Ideas?
