AISI 4320-modified, Higher Tensile properties:1260mpa and Impact @-40DegC
AISI 4320-modified, Higher Tensile properties:1260mpa and Impact @-40DegC
(OP)
thread330-174717: 20CrMnTi vs AISI 4320/8620
Hi, my first post, hope em at the ryt place to solve dis..
we have an RFQ for gear casting, in AISI 4320-Modified chemistry(C:.23-.28, Mn:.75-1.25, Cr:.6-1.0, Ni:1.5-2.0,Mo:.4-.5, Ti:.015-.045)requires UTS(min): 1260mpa, Y.S(min):1000mpa, Elong:9min, Charpy V impact@ -40DegC: 15J min. Hardness : 395(min)
HT:WQ+ Temp 1 +Temp2, and we are only jus crossing the 1000 for UTS,
comments please on the feasibility of this grade, and heat treatment..
Hi, my first post, hope em at the ryt place to solve dis..
we have an RFQ for gear casting, in AISI 4320-Modified chemistry(C:.23-.28, Mn:.75-1.25, Cr:.6-1.0, Ni:1.5-2.0,Mo:.4-.5, Ti:.015-.045)requires UTS(min): 1260mpa, Y.S(min):1000mpa, Elong:9min, Charpy V impact@ -40DegC: 15J min. Hardness : 395(min)
HT:WQ+ Temp 1 +Temp2, and we are only jus crossing the 1000 for UTS,
comments please on the feasibility of this grade, and heat treatment..





RE: AISI 4320-modified, Higher Tensile properties:1260mpa and Impact @-40DegC
RE: AISI 4320-modified, Higher Tensile properties:1260mpa and Impact @-40DegC
You may need an extended homogenization HT before the hardening. The Ni and Mo will partition on solidification and you would not get uniform properties.
That said, section thickness is the biggest issue.
You are going to have to quench this very aggressively in order to get good hardening.
I am not sure if retained austenite will be an issue or not, you may need to quench, temper, cryo, temper in order to get strength and toughness.
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P.E. Metallurgy, Plymouth Tube
RE: AISI 4320-modified, Higher Tensile properties:1260mpa and Impact @-40DegC
while quenching we kept the samples on motion in water
and loaded directly fr tempering
RE: AISI 4320-modified, Higher Tensile properties:1260mpa and Impact @-40DegC
RE: AISI 4320-modified, Higher Tensile properties:1260mpa and Impact @-40DegC
RE: AISI 4320-modified, Higher Tensile properties:1260mpa and Impact @-40DegC
Were the cast keel blocks somewhat representative of the rough gear casting? Will there be major changes of dimensions within the casting?
RE: AISI 4320-modified, Higher Tensile properties:1260mpa and Impact @-40DegC
Usually what standard properties are meant for this Gr.AISI 4320, any suggestion for an alternate cast material??
RE: AISI 4320-modified, Higher Tensile properties:1260mpa and Impact @-40DegC
RE: AISI 4320-modified, Higher Tensile properties:1260mpa and Impact @-40DegC
Or can anybody suggest me an alternate choice of material with strength and toughness/ Heat treatment
thanks
RE: AISI 4320-modified, Higher Tensile properties:1260mpa and Impact @-40DegC
RE: AISI 4320-modified, Higher Tensile properties:1260mpa and Impact @-40DegC
RE: AISI 4320-modified, Higher Tensile properties:1260mpa and Impact @-40DegC
Hardening at 880 Deg C:during heating soaked at 700 Deg C for 2hours, then rose to 880 Deg C, soak for 6 hours, after completion of soaking raise 15 Deg C higher (895 Deg C) and keep it for 15minutes, then quenched in the water.Intermediate Tempering @ 550Deg C and final Tempering @ 550DegC.
RE: AISI 4320-modified, Higher Tensile properties:1260mpa and Impact @-40DegC
Also, in the related thread there was some discussion of the gear being carburized. Is that still the case?
RE: AISI 4320-modified, Higher Tensile properties:1260mpa and Impact @-40DegC
RE: AISI 4320-modified, Higher Tensile properties:1260mpa and Impact @-40DegC
TVP. 450-500 also trialed BT low impact performance..