[assasinator]

i post this on other forums. i'll try to find the link.

powdered metal rods are inherently as strong or stronger in many aspects to 4340 connecting rods. what is important is metallurgy and design strength.


https://www.forging.org/system/files...ueBehavior.pdf


thereis a slide show failure rates of similar design strenth forged and sinter forged rods.


fstigue is the primary advantage of 4340 forged.


note slide 101 and later test charts.

page 231 is the conclusion.


here is a 2009 new material paper on improved powder forged rods. these are superior in most categories.

http://www.hoganas.com/Documents/Pub...Warzel_Rev.pdf

Lee et al showed new forged materials with yield strength in the 760-840 MPa (110,000 – 122,000 psi) range depending on the thermal history

3. These figures should be compared to conventional micro alloyed steel were the yield strength is in the range 520-560 MPa (75,000 – 81,000 psi). The authors claim an improvement in machinability while maintaining fracture split capability. These differences are reflected in the fatigue strength that reaches 450 (65,000 psi) and 350 MPa (51,000 psi) for the improved and conventional steels respectively.