[Jewelry making - Article 00165] - Re: [Orchid] Titanium finish

[Martin Niemeijer]

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    Hello dave, The finer the sandblasting grid is the darker the look.
    also if you oil the surface after blasting the surface will look
    darker than a decrease surface. 

    here a copy of my explanation of tension rings and the effect with
    different material alloys. 

    Hello Shaun, Ti6AL-4V is the most sold alloy of titanium. (55% of
    the market) . 35% is titanium pure is several grades. and the rest
    others special alloys.. So every titanium industrial supplier should
    be able to supply you this alloy. However if you want to use this
    alloy you need to deform it above 450 degrees Celsius to wind rings.
    The problem is now that you have damaged the structure and if you
    want a strength back you need to quench an precipitate harden this
    alloy. Precipitation hardening is the same as age hardening, you need
    to give the alloy elements the movement (heat) and time to creep
    towards the crystal edges. they will form wedges and increase so the
    strength. The best way is now to heat again up to 700 degr. C. and
    quench in water. Make fine crystals again) Now age harden at this
    same temperature for 2-4 hours. at 500 degr C. What you get now is an
    alloy with a tensile strength of 1000N/mm2 This is the double of
    unalloyed titanium. 

    But why the fuzz.

    The stiffness (flexibility) of the titanium is determing the force
    necessary to bend for an x distance. Read this twice to understand.

    This stiffness factor is called E-modules.

	E-mod for :
	grade 1	= 102000N/mm2
	grade2-3 = 104000N/mm2
	TiAl16-V4 = 115000N/mm2

    So by using an alloyed titanium, the force to remove a stone out of
    a tension ring is only 10-13% higher. The tensile strength is only
    saying how high you can pull on this material before is breaks., but
    the elongation still goes along the E-modules line.

    My advise is to stick with the unalloyed stuff. it is also easier to
    deform, and we don't need the high tensile strength. we are not
    building airplanes.

Martin Niemeijer

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