Heat Treat for 4140 to Increase Wear Resistance?
Heat Treat for 4140 to Increase Wear Resistance?
(OP)
4140 as cast pin in sliding contact with 8620 flat surface experiencing considerable wear when flat surface is a little rough (150-250 microinch). Light load on pin, moly grease used between the two surfaces. Wear considerably less when 8620 is 60-100 microinch, but difficult to consistently machine to this finish.
4140 is Rb 85-100, as cast, 8620 is heat treated to Rc 30-35.
If 4140 is heat treated, how hard can it be to increase wear resistance and not cause galling or wear of 8620 surface? What should detailed heat treatment be?
Thanks,
4140 is Rb 85-100, as cast, 8620 is heat treated to Rc 30-35.
If 4140 is heat treated, how hard can it be to increase wear resistance and not cause galling or wear of 8620 surface? What should detailed heat treatment be?
Thanks,





RE: Heat Treat for 4140 to Increase Wear Resistance?
Perhaps a change to 4340 will result to better response to heat treatment and also improve hardenability.
" All that is necessary for triumph of evil is that good men do nothing".
Edmund Burke
RE: Heat Treat for 4140 to Increase Wear Resistance?
Can either flame or induction hardening be done on a batch of small parts? Is there a procedure and hardeness target?
How about a through hardening heat treat process or would this likely result in warpage?
RE: Heat Treat for 4140 to Increase Wear Resistance?
RE: Heat Treat for 4140 to Increase Wear Resistance?
Which process would give Rc 40 and should the pins be harder than the mating surface which is Rc 30-35?
RE: Heat Treat for 4140 to Increase Wear Resistance?
RE: Heat Treat for 4140 to Increase Wear Resistance?
Since pin as cast is varying between Rb85 and Rb100, it seems it should be harder. What process would get it to Rc30-35? Is galling a problem if the two are near the same hardness or does this apply only to softer materials?
RE: Heat Treat for 4140 to Increase Wear Resistance?
Galling betweent two steel parts will if there is metal to metal contact under high enough load. The lower the hardness of either component will increase galling tendency. Good lubrication will reduce galling. Once both surfaces are work hardened, galling will not be much of an issue.
rp
RE: Heat Treat for 4140 to Increase Wear Resistance?