Austempered ductile iron
Austempered ductile iron
(OP)
I am looking for another an alternative to austempered ductile iron. The geometry requires that the part be cast. We currently use ASTM A536 Grade 80-55-06 with an austemper heat treatment to achieve 385-470 BHN. Because these parts are in moving contact with each other, wear is significant. Does anyone have a suggestion for an improved material.





RE: Austempered ductile iron
But i don“t speak english very well so, maybe i did't understand your question
RE: Austempered ductile iron
Austempering a type of heat treatment, suitable for both steels and cast irons. Use the following link for more information:
http://www.ductile.org/didata/Section4/4intro.htm
RE: Austempered ductile iron
RE: Austempered ductile iron
RE: Austempered ductile iron
Actually, both. Austempering adds a significant cost, however I currently reach only 400 hours of operation before the 4mm treatment depth is exceeded. I was hoping to find a material that may be of approximately the same cost, yet obtain improved wear characteristics. I realize the at 477 BHN, we're getting fairly high hardness and a point of diminsishing returns relative to cost may occur with a significant improvement above the existing properties.
Thanks.
RE: Austempered ductile iron
Companies like Falk make cast carburized gears - this would give you the ability to manufacture the part plus the carburized case will be around 60 Rc
RE: Austempered ductile iron
RE: Austempered ductile iron
The original question indicated that casting is the only viable route to produce the desired shape and my follow up question was to try to see if the problems were associated with wear or some other failure mechanism. It appears that wear is the issue so carburizing the affected surfaces may help to extend the life of the parts.
RE: Austempered ductile iron
RE: Austempered ductile iron