CN100503856C - Low-cost titanium alloy - Google Patents

Abstract

The invention discloses a low-cost adjustable titanium alloy, which is characterized by the following: adding Al, Fe, Cr, Ni, S, B, C and Mo in the titanium with weight percentage of X+Y+Z+Ti at 100%(X=Al<=6%,Y=[(0.3<=Fe <=5%)+(0.1<=Cr<=2%)]<=7%,Z=[(Ni<=0.5%)+(S<=1%)+(B<= 0.5%)+(Mo<=0.8%)+(C<=0.5%)]<=3%); blending allocated alloy materials to form self-consumption electrode; fusing in the vacuum arc furnace twice; fixing one parameter of X, Y and Z and changing other two values to allocate the needed dynamic property of titanium alloy; adjusting delta b within 350Mpa-1250Mpa with delta at 5-30% and phi at 10-55%.

Description

A kind of low-cost titanium alloy

Technical field

The present invention relates to a kind of titanium alloy, particularly a kind of low-cost titanium alloy that adopts cheap alloy element to replace noble element.

Background technology

The most noble elements such as vanadium, molybdenum, niobium, zirconium, tin, tantalum that use of commercial titanium alloy interalloy element make the manufacturing cost of titanium alloy and use cost high at present, have influenced applying of titanium alloy.For this reason, people begin to explore the method that reduces titanium alloy cost of manufacture and use cost, and its approach has: by the mode of production of improving starting material-titanium sponge reduce material cost, adopt cheap alloy element, simplify titanium alloy complete processing, optimize the whole bag of tricks such as processing technology of Ti product.Wherein at the Timetal LCB alloy of the Timet company exploitation of adopting Ti-SP alloy, Ti12LC and the Ti8LC alloy and the U.S. that the exploitation of NW China non-ferrous metal research institute is arranged aspect the cheap alloy element in the recent period.These alloys all wish to replace Ti-6Al-4V, and their common alloying characteristics are to have adopted the Mo-Fe alloy with respect to Al-V alloy cheapness to reach the purpose that reduces cost as master alloy.Yet molybdenum remains noble element, so the cost reduction is limited, has only resourceful cheap elements such as the iron of employing, aluminium, silicon, chromium, nitrogen, carbon, boron just can reach and reduces the titanium alloy cost significantly.For this reason, many manufacturers and knowledgeable people have carried out research repeatedly, but do not have ideal method to solve the problems referred to above so far as yet.

Summary of the invention

For overcoming the above-mentioned disadvantage that existing titanium alloy exists, problem to be solved by this invention provides a kind of low-cost titanium alloy that obtains different mechanical properties with cheap alloy element replacement noble element by the fine setting of alloy component.

The technical solution adopted for the present invention to solve the technical problems adds eight kinds of elements such as Al, Fe, Cr, Ni, S, B, C, Mo in titanium, its weight percentage is formed description: X+Y+Z+Ti=100% as follows, wherein:

X＝Al≤6％，

Y＝[(0.3≤Fe≤5％)+(0.1≤Cr≤2％)]≤7％，

Z=[(Ni≤0.5%)+(S≤1%)+(B≤0.5%)+(Mo≤0.8%)+(C≤0.5%)]≤3%, and unavoidable impurities element, the alloy material for preparing by above-mentioned formula is pressed into consumable electrode behind thorough mixing, secondary smelting is made in vacuum arc fumace.

X in the formula of the present invention, Y, each parameter of Z are fixed the mechanical property that other two parameters of a parameter change can mix required titanium alloy arbitrarily, and σ b can regulate in 350Mpa～1250Mpa, and δ can regulate in 5%～30%, Can in 10%～55%, regulate.

After the above-mentioned technical scheme that provides is provided, by replacing noble element with cheap alloy element, and alloy component is allocated by above-mentioned described requirement, not only production cost can descend significantly, and can obtain the titanium alloy that different mechanical properties requires, make the Application Areas of titanium alloy more wide.

Embodiment

Below in conjunction with specific embodiments the low-cost titanium alloy of a kind of performance-adjustable of the present invention is sketched, in titanium, add eight kinds of elements such as Al, Fe, Cr, Ni, S, B, C, Mo, the weight percentage of alloy is formed description: X+Y+Z+Ti=100% as follows, X=Al≤6% wherein, Y=[(0.3≤Fe≤5%)+(0.1≤Cr≤2%)]≤7%, + (B≤0.5%)+(Mo≤0.8%)+(C≤0.5%)]≤3%, and the unavoidable impurities element Z=[(Ni≤0.5%)+(S≤1%).The alloy material for preparing by above-mentioned formula is pressed into consumable electrode behind thorough mixing, secondary smelting becomes ingot casting in vacuum arc fumace, can be processed into the titanium alloy product of all size kinds such as bar, sheet material, tubing, band, wire rod.

The present invention fixedly X and Y content in above-mentioned formula change the content of Z, the mechanical property that can regulate the alloy finished product in given numerical value; Perhaps change the content of X by fixing Y and Z, or the fixing content of X and Z change Y, the mechanical property that also can regulate the alloy finished product.According to performance demands, σ b can regulate in 350Mpa～1250Mpa, and δ can be 5%～30% with interior adjusting,

Can be 10%～55% with interior adjusting.

According to description of the invention, recommend following examples:

The embodiment summary sheet

Claims (1)

1, a kind of low-cost titanium alloy is characterized in that: its weight percentage is formed description: X+Y+Z+Ti=100% as follows, wherein:

X＝A1≤4％；

3.1%≤Y≤7%, Y=Fe+Cr, wherein 2.5%≤Fe≤5%, 0.6%≤Cr≤2%; 0.2%≤Z≤3%, Z=Ni+S+B+Mo+C, 0.2%≤Ni≤0.5% wherein, S≤1%, B≤0.5%, Mo≤0.8%, C≤0.5%; And the unavoidable impurities element, the alloy material for preparing by above-mentioned formula is pressed into consumable electrode after mixing, and secondary smelting is made in vacuum arc fumace.