Hardness (Jonimy?) Curves for 50CrMo4 or 4150 Alloy Steel
Hardness (Jonimy?) Curves for 50CrMo4 or 4150 Alloy Steel
(OP)
Can anybody point me to a referance/website (where I don't have to take out a mortgage to get a hay stack with the pertinent needle)that publishes Hardness Curves for 50CrMo4 Chrome-Moly alloy. SAE/AISI 4150 IS an equiv' alloy and so would suffice for my purposes.





RE: Hardness (Jonimy?) Curves for 50CrMo4 or 4150 Alloy Steel
The curve is essential a straight line form 1/16" to 2" from the quenched end. The value at 1/16" is Rc 60.5 while Rc 41 @ 2"
Do you need the curve and just specific values of equivalent diameters for oil or water quench?
RE: Hardness (Jonimy?) Curves for 50CrMo4 or 4150 Alloy Steel
I also consider the core to be "soft" at <200Hv, I would prefer this to be 300Hv or better to help support the case. There is no spec' on the drawing for the core, so I presume the material was supplied annealed as indicated by the hardness.
The avilability of the curve would help to elucidate the conclusion in my report.
RE: Hardness (Jonimy?) Curves for 50CrMo4 or 4150 Alloy Steel
RE: Hardness (Jonimy?) Curves for 50CrMo4 or 4150 Alloy Steel
RE: Hardness (Jonimy?) Curves for 50CrMo4 or 4150 Alloy Steel
Effective essentially defines where case contributes to the wear properties of the base metal. This is sticking point with me as any significant improvement I've seen in wear properties began at a hardness of 58Rc and above.
My data shows a surface hardness of 62Rc on a 1" oil quenched round. As stated in my previous post the 1/16" hardness in the 60.5Rc. The annealed hardness is 210HV
I concur with you observations and conclusions about your failure as you seem to have an old fashion case of "Case Crushing". You might want to heat treat the cam prior to the flame hardening proceure.