What are the disadvantages of faster quenchant?

[milkbaby]

I've been using mostly 1084 and 15N20 with backyard HT with a 2 brick forge and canola oil quenchant. I know I won't "extract the max" with 1095, but I have some and wanted to play with hamon, so I was thinking of getting some Parks 50.

What are the disadvantages of using Parks 50 as a quenchant for steels that don't need the faster cooling performance? Will there be more chance of getting stress fractures in 1084 when quenched in Parks 50 than canola oil or AAA?

I may just try interrupted quench from water then into canola, that would be cheap and easy, but I figured I might as well ask the above and learn. Thanks!

 

[DevinT]

Disadvantage is quench cracking.

Advantage is reduced retained austenite.

Hoss

 

[jdm61]

You aren't going to have issues with 1084 and#50. It is a fairly shallow hardening steel. Very thin sections of CuForgeV is where I ran into cracking issues with #50. Some guys us #50 on 52100.

 

[Willie71]

15n20 is fine in Parks 50 or DT-48. When using lower aust temps in 52100, or 15n20, faster quenches work better.

1084 is technically a water hardening steel, but it quenches fine in heated oil, or fast oil.

 

[comet_sharp]

You aren't going to have issues with 1084 and#50. It is a fairly shallow hardening steel. Very thin sections of CuForgeV is where I ran into cracking issues with #50. Some guys us #50 on 52100.

I quenched a wrought iron/52100 san mai blade into parks 50 from 1525 with a 20 minute soak 2 days ago. Straight n hard
Even without jacket if I do a short anneal before quench I rarely get much distortion.
-Trey

 

[Willie71]

I quenched a wrought iron/52100 san mai blade into parks 50 from 1525 with a 20 minute soak 2 days ago. Straight n hard
Even without jacket if I do a short anneal before quench I rarely get much distortion.
-Trey

Under 1500f probably requires a fast oil, 1500-1525 is probably fine in most cases. I’m doing some samples in 52100 with medium speed oil. If there’s a bump in toughness, we will have the answer we need.

 

[comet_sharp]

Under 1500f probably requires a fast oil, 1500-1525 is probably fine in most cases. I’m doing some samples in 52100 with medium speed oil. If there’s a bump in toughness, we will have the answer we need.

Been waiting for someone to do this actually . Thanks
-Trey