FRANK ADAMS

[OB_DanaT]

ATOM,

The directionality of the grains is not a desired feature but is instead a compromise. The directionality will always be either perpendicular to a forging or parrallel to a rolling direction (in the case of billets) without heat treating.

You really don't want this but for many high strength alloys it is the only way to achieve the required strengths.

The real question comes down to price. Better alloys can be found but it a question of money. For example, a non-directional high strength steel (minimum twice the performance of a steel crankshaft forging without directionality) will cost you about 20 times as much for raw material. Furthermore you have to buy this in 2 ton increments. To compare prices (rough raw materials); Steel $0.40/lb. Titanium $4.50/lb. The alloy I mentioned $17/lb. Now extrapolate that out with a two tons order and you have to $34000 worth of the stuff. By the way, its major use is areospace on the YF-22.

-Dana

[OB_Johnnycheese]

Sorry Frank my post was for Omega.
I should have started with his name.
I did not post due to the Gray matter in my brain was sort of Choclate brown after this week.

[OB_THEATOMSMASHER]

KEEP GOING I would like to here your opinion on the billet EN-30 !YOUR THE ONE WHO KNOWS METAL SO SHARE SHARE SHARE!I am always interested in any other alternatives this is how advancements take place.

[OB_DanaT]

ATOM,

As EN-30 is a proprietary trade name could you please give me UNS number, manufucaturer, or other means of tracking it down. The current data bases do not include EN30. There are current listing for EN16, EN25, EN26, EN36, EN39, EN41, EN42, EN56.

The EN series of steels contain nickel which helps the formation of martensite in steel. There are other methods for causing the formation of martensite other than the addition of nickel. Martensite, by nature is directional. Since I can only speculate on the composition based upon other EN series steels, this is just a good guess at why it is being used. Still these steels are a compromise in price/stength/formabilty/ect.

-Dana

[OB_THEATOMSMASHER]

DANA- I will get the specs and let me know what you think.And yes they are a comprimize.But so is everything in a cost dictated world.I feel strength in the cases is the main issue in a directionaly comprimized crank material design.then the amount of directional forces will be focussed on the operating stresses instead of movement related stresses due to poor containment of the crankshaft itself.Then at least fatigue limit or tension cycles can be increased.And also its torsional load capabilities would be taken care of in one swoop.What do you think? EN-30 is suppose to be 20% stronger than E4130 so I think that it should be roughly A tensile strength of 108,000psi.correct?

[Frank Adams]

THEATOMSMASHER, Here is an e-mail address of a guy that will surely be able to answer your questions.

He even speaks your language!

themotorhead@aol.com

Good Luck!

[Guest]

In case your wondering what that sound was, that was your BALLS getting smashed!
ATOMSMASHER!

[OB_THEATOMSMASHER]

Dana i got a question for you like that.doesn't a crank have to be stronger in one direction tha another and if it did have no recognizable direction it might make it equally strong in all directions but not as strong as it could be if it had properly designed graneler direction for improved strength along the most load bearing direction whether that is in the tortion loads or on compression loads and would this type of directional or semi directional graining help extend the tension cycles.any help would be apriciated i see this is your specialty and hope i might understand a little better on this topic.thanks alot!and also curious about copper berillium valve seats and what mix if this alloy is a good comprimize between strength and reliability in this environment.

[OB_VegasDude]

not only that, but the laminer flow of the oil over the crank is in direct relation to of the co efficient of crank velocity throught the oil. It also depends on the temperature of the oil as well.

[OB_THE MOTORHEAD]

ATOM call me on landline see your british steel similar to scats is up on post.let me know what scat had to say.and yes its somewhat omniphorous from my limited understanding of its meaning.

[This message has been edited by THE MOTORHEAD (edited 04 March 2000).]

[OB_VegasDude]

not to mention bifurcation and obfuscation.....................

[OB_THE MOTORHEAD]

you win