Recent content by Greenleader

Thank you met, as usual. Some folks are labeling carbides as intermetallics, and such.

I know conventional steel has no molecules, as the type of bond the atoms have is crystalline. However, since my recent melt result, I have been trying to understand exactly what type of structure/bond intermetallics have. As I read it, 2 metals form a covalent bond, i.e. molecular. Is that an...

I made an alloy that possibly formed Iron-niobium intermetallic filiments. I'm having trouble finding a micrographs of such a structure. Any hep? Google-fu is weak. Thanks.

Thank you! Do you think epsilon iron, (not carbides), can be ordered by chemistry @ normal pressures?

Is epsilon iron magnetic?

Simple question, when and where does epsilon-iron, (hexagonal, close packed), exist. That is on the surface of the earth? Thanks.

Be sure the Nb/Cb is free of oxide. It can be a bugger in welds.

Thanks for the paper. I had in mind columbium, (niobium), as grain refiner to make the most of the Re. Thoughts?? Thanks, Arvel.

Would you benefit from the addition of rhenium in medium carbon steel, other than the obvious high heat environs? Rhenium is a very interesting transition metal, with some very good qualities. Thanks.

Interesting. right now i'm experimenting with medium carbon, as I am after 100% lath martensite, for strength and tougness, with the nickel adding impact resistance. I'm just a little weak on the hardness. I need a tough 60Rc, using the chemistry close to 300m.

Thanks for the responses. I happened to have some free W. I was not sure if tungsten resisted tempering, or it just uped' the average carbide hardness. Thanks.

Looking for low 60's Rc @575F draw. The particular alloy is actually 4350 mod. so it's still med carbon.

Would the addition of tungsten, .55%, to 4340 mod, (300m),contribute a few points of hardness after tempering to spec? I would like to add a little hardness without sacrificing strength or toughness or reducing the draw temp.

Thanks very much. The reaction crucible is cyledrical, with cone shaped bottom. I have a bunch of magnets under the mould crucible to possibly help with slag seperation. ???? The MgO is a good idea. The blacksmith/sword maker is probably me ;) Thanks once again!

Thanks for those links unclesyd. Also for the safety tips. I've made a few runs using a 5000 F rated furnace cement, but it takes a beating and needs repair after each run. The secondary crucible is the problem. I have to hold the molten charge, about 1 to 4 pounds, at heat, without damage to...