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Heat treated titanium-aluminumvanadium alloy

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US2906654A
US2906654A US45803254A US2906654A US 2906654 A US2906654 A US 2906654A US 45803254 A US45803254 A US 45803254A US 2906654 A US2906654 A US 2906654A
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titanium
alloy
ductility
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tensile
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Abkowitz Stanley
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Abkowitz Stanley
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18High-melting or refractory metals or alloys based thereon
    • C22F1/183High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon

Description

S. ABKOWITZ Sept. 29, 1959 HEAT TREATED TITANIUM-ALUMINUM-VANADIUM ALLOY Filed Sept. 23, 1954 5 96 ALUMINUM owmM mmm

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o v mommwwwwmmw 0.,m...o.m.o.o.o.o.0.m. wwmmmmmmmmm Fig. E.

O m 0 O 3 2 l /oALUMlNUM IN VEN TOR United States Patent HEAT TREATED TITANIUlVl-ALUMINUM- VANADIUM ALLOY Stanley Abkowitz, Warren, Ohio, assignor to the United States of America as represented by the Secretary of the Army 7 Application September 23, 1954, Serial No. 458,032

1 Claim. (Cl. 148-325) (Granted under Title as, US. Code 1952 sec. 266) .The invention described herein may be manufactured and used by or for the Government of the United States for governmental purposes without the payment of any royalty thereon.

This invention relates to titanium base alloys and more particularly to ternary alloys of titanium containing minor proportions of aluminum and vanadium.

Since titanium base alloys offer such desirable properties aslightness of weight and resistance to corrosion, the art is continually striving to utilize these alloys as an effective substitute for high-strength steels. However, it has been found that the addition of the alloying elements heretofore utilized for the purpose of increasing tensile strength in titanium base alloys have invariably decreased the ductility thereof to such extent as to prevent adequate fabrication of structural shapes therefrom. Moreover, these prior art alloying elements also contribute to an appreciable reduction in the resistance to impact or toughness of the resulting alloy thereby seriously limiting the usefulness thereof for such important applications as ordnance materiel.

It is, therefore, an object of this invention to provide ternary alloys consisting of titanium, aluminum and vanadium.

A further object of this invention is to produce hightalc-e 2 dium produces a substantial increase in tensile strength together with a corresponding increase in both ductility and toughness. At the same time, it has been determined that while any further increase in the percentages of aluminum above 6% produced a corresponding decrease in ductility, the ease of fabrication of the resutling alloy was still substantially greater than that encountered in existing commercial types of titanium base alloys having comparable tensile strengths. 7

While most titanium base alloys suffer a marked loss in ductility as a result of any increase in those alloying elements which are known to provide high tensile strength, such is not the case in the present invention where the ductility actually increases at a constant rate as indicated in Fig. 2 of the drawing until such time as the total aluminum content exceeds 6%. A further aluminum increase up to 7% will, of course, produce the conventional loss in ductility but even then the reduction in area in the annealed state of the alloy remains at about 17% which is considered satisfactory from the standpoint of ordinary mechanical Working. However, when the aluminum content is increased beyond 7%, the ductility of the resulting the third alloying element ordinarily consists of manstrength, tough titanium base alloys of aluminum and vanadium characterized by a degree of ductility superior to that found in existing types of commercial alloys.

Yet another object of this invention is to provide-a titanium base alloy possessing an optimum'combination of tensile strength and ductility superior in either respect to that found in known commercial type alloys.

It is a specific object of this invention to provide a titanium base alloy of aluminum and vanadium wherein the proportions of the alloying elements are particularly selected to yield an optimum combination of tensile strength and ductility together with a useful level of toughness and weldability.

Other advantages and purposes of the present invention will become apparent from the following disclosure thereof, when considered in conjunction with the accompanying drawing wherein:

Fig. 1 is a graph illustrating the efiect on tensile strength, in both the annealed and heat treated conditions, of increasing the proportion of aluminum in a Ti--Al-V alloy containing 4% vanadium; and

Fig. 2 is a graph which shows the effect on ductility as measured by the reduction in area of the same additions of aluminum under the same conditions as those of Fig. 1.

According to the present invention, it has been discovered that adding up to 6% aluminum to a binary titanium alloy which includes from 3% to 5% of vanaganese, chromium, or iron. While these elements do improve the tensile strength of the resulting alloy, they severely decrease the ductility thereof. However, investigation has revealed that unlike the alloying elements of the prior art, vanadium has little adverse effect on ductility, possibly because it, as well as the aluminum, does not appear to form compounds with the titanium. It has been previously established that the percentage of beta stabilizing elements alloyed with titanium has a marked effect on weldability. Consequently, in order to provide maximum tensile strength consistent with good weldability, the vanadium content of the alloys should be limited to 4%. On the other hand, where weldability is not of prime importance, the vanadium content can be increased to 6% in order to attain the maximum tensile strength possible without an undue loss in ductility.

Toughness is another vital factor in those titanium base alloys intended for ordnance use. As is apparent from the table, the preferred alloy provides adequate toughness as indicated by the 11 ft.-lbs obtained in a V-notch Charpy impact test at -40 C. However, where slightly lower tensile strengths are permissible, both the ductility and toughness of the preferred alloy can be increased to much higher levels by the proper heat treatment as indicated in the table.

The titanium base alloys of the present invention may be prepared from either commercial or high purity titanium. However, when the commercial product is employed, the amounts of such contaminants as nitrogen, oxygen, carbon, and hydrogen must be kept to a minimum. For example, neither the oxygen nor carbon should exceed 0.1% while the nitrogen must be kept below 0.07% and the hydrogen below 0.03% in order to limit their embrittling eifects on the alloy.

It has been found that the optimum combination of high strength and ductility is obtained when a 6% Al4% V titanium base alloy is subjected to a solution treatment at a temperature just below the beta transus and is there after water-quenched and tempered in the alpha-beta range. Illustrative properties of the preferred alloy composition at various heat treatments are shown in the fol- [20 1b. ingot rolled to ;,-inch plate] MECHANICAL PROPERTIES AFTER VARIOUS HEAT TREATMENTS treated for one hour at 1750 F. and then quenched and then further heat treated for two hours at 800 F. and

V-notch,

Yield Ultimate Charpy Heat treatment strength, tensile, BHN Percent Percent impact p.s.i., 2% p.s.i. elon. RA. energy,

930 F. (1 hr.) WQ 159,200 336 14.3 39.4 15.0 930 F. (1 hr.) WQ 161,500 336 15.0 43.6 15.8 930 F. (1 hr.) WQ 153,000 331 16. 4 46.1 18.0 930 F. (1 hr.) WQ 156, 000 331 17. 1 49. 4 17. 5 930 F. (1 hr.) WQ, 168,200 349 14.3 40. 2 14.0 930 F. (1 hr.) WQ, 750 170, 200 352 12. 9 37. 6 13. 8 1,650 F. (1 hr.) WQ, 60 171, 400 352 15.0 49.8 13.2 1,650 F. (1 hr.) WQ, 80 185,400 375 11.4 37.1 12.0 1,650 F. (1 hr.) WQ, 1,00 5.) AC 182, 363 12.9 45.7 12.7 1,750 F. (1 hr.) WQ, 600 F. (2 hrs.) AC 164,500 188,000 375 12. 1 43. 2 11. 8 1,750 F. (1 hr.) WQ, 800 F. (2 hrs.) AC 170,500 192,800 388 14.3 45.3 11.0 1,7 0 F. (1 hr.) WQ, 1,000 F. (2 hrs.) AG... 178,000 190,400 388 1 3. 6 1 5. 11.0 930 F. (1 hr.) WQ, 1,200 F. (2 hrs.) AC... 4, 142,600 305 15.7 46.5 21.5 1,800 F. (1 hr.) WQ, 1,000 F. (2 hrs.) AC-.. 163, 500 179, 400 380 6. 4 12.4 7, 5 1,800 F. (1 hr.) WQ, 1,200 F. (2 hrs.) AC 153,000 166,000 350 10.7 16.6 10.5 1,650 I (1 hr.) WQ, 1,200 F. (2 hrs.) AC 148,000 154,000 331 17. 1 51.7 18.2 1,650 F. (1 hr.) AC, 1,200 F. (2 hrs.) AC 134, 500 -141,400 302 16.4 51.7 22.5 1,650 F. (1 hr.) AC, 1,000 F. (2 hrs. A0 138,000 147, 316 18. 6 56. 3 32.0

I Flaw in specimen-break in outer third. WQ=water quench; AC=air cool.

The best heat treatment for the preferred 6% Al-4% then arr cooled to provlde a tensile strength of about V alloy was found to be a solution treatment at 1750 F. for one hour followed by a two-hour treatment at 800 F. and air-cooled since it provides the optimum combination of 192,000 p.s.i. tensile strength and 42% reduction in area in thicknesses of approximately one-half inch. Even in the annealed condition provided by 930 F. anneal for one hour and water-quenched, the tensile strength has been found to reach 160,000 p.s.i. and at the same time provide excellent ductility as shown by the 45% reduction in area.

In addition to the outstanding properties of tensile strength, ductility, and toughness at room temperatures, the 6% Al-4% V titanium base alloy is also characterized by its ability to maintain tensile strengths up to 110,000 p.s.i. at such elevated temperatures as 700 F.

Although a particular embodiment of the invention has been described in detail herein, it is evident that many variations may be devised within the spirit and scope thereof and the following claims are intended to include such variations.

I claim:

A titanium base alloy consisting of about 6% aluminum, about 4% vanadium, and the balance of titanium with incidental impurities, said alloy having been heat 1,92 ,000 p.s.i., a reduction in area of about 45%, and a Charpy V-notch impact energy of at least 11 foot pounds at 40 C.

References Cited in the file of this patent UNITED STATES PATENTS 992,423 Hutfard May 16, 1911 2,703,278 Finlay et a1 Mar. 1, 1955 2,754,204 Jaffee et a1. July 10, 1956 FOREIGN PATENTS 718,822 Germany Mar. 24, 1942 OTHER REFERENCES Product Engineering, vol. 20, No. 11, November 1949, pp. 147-149.

Titanium Project (Mallory Co.), Final Report No. 17, Navy Contract No. NO,,(s) 8698, released as PB103370 by OTS on June 15, 1951.

Titanium Project, Final Report No. 9 (Mallory Co.), Navy Contract No. NO,,(s) 51-006-C, dated January 26, 1952, released as PB107150 by OTS on September 12, 1952.

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US3248680A (en) * 1962-12-11 1966-04-26 Ward Leonard Electric Co Resistor
US3248679A (en) * 1962-12-11 1966-04-26 Ward Leonard Electric Co Metal alloy resistors
US3511622A (en) * 1965-10-12 1970-05-12 Milton A Nation Titanium wire and wire rope
US4149884A (en) * 1978-06-30 1979-04-17 The United States Of America As Represented By The Secretary Of The Air Force High specific strength polycrystalline titanium-based alloys
US4167427A (en) * 1977-05-25 1979-09-11 Mitsubishi Jukogyo Kabushiki Kaisha Heat treatment of titanium alloys
US4299626A (en) * 1980-09-08 1981-11-10 Rockwell International Corporation Titanium base alloy for superplastic forming
EP0163018A2 (en) * 1981-04-30 1985-12-04 Nissan Motor Co., Ltd. Method of welding titanium alloy parts with an insert member consisting essentially of 0 to 3% by weight of aluminium and the balance of titanium
US4745977A (en) * 1985-04-12 1988-05-24 Union Oil Company Of California Method for resisting corrosion in geothermal fluid handling systems
US4898624A (en) * 1988-06-07 1990-02-06 Aluminum Company Of America High performance Ti-6A1-4V forgings
EP0396236A1 (en) * 1989-05-01 1990-11-07 Titanium Metals Corporation of America High strength alpha-beta titanium-base alloy
US6635098B2 (en) 2001-02-12 2003-10-21 Dynamet Technology, Inc. Low cost feedstock for titanium casting, extrusion and forging
US20060045789A1 (en) * 2004-09-02 2006-03-02 Coastcast Corporation High strength low cost titanium and method for making same
US20070056776A1 (en) * 2005-09-09 2007-03-15 Overstreet James L Abrasive wear-resistant materials, drill bits and drilling tools including abrasive wear-resistant materials, methods for applying abrasive wear-resistant materials to drill bits and drilling tools, and methods for securing cutting elements to a drill bit
US20070056777A1 (en) * 2005-09-09 2007-03-15 Overstreet James L Composite materials including nickel-based matrix materials and hard particles, tools including such materials, and methods of using such materials
US20070102199A1 (en) * 2005-11-10 2007-05-10 Smith Redd H Earth-boring rotary drill bits and methods of manufacturing earth-boring rotary drill bits having particle-matrix composite bit bodies
US20070102202A1 (en) * 2005-11-10 2007-05-10 Baker Hughes Incorporated Earth-boring rotary drill bits including bit bodies comprising reinforced titanium or titanium-based alloy matrix materials, and methods for forming such bits
US20080029186A1 (en) * 2006-02-14 2008-02-07 Stanley Abkowitz Homogeneous titanium tungsten alloys produced by powder metal technology
US20080073125A1 (en) * 2005-09-09 2008-03-27 Eason Jimmy W Abrasive wear resistant hardfacing materials, drill bits and drilling tools including abrasive wear resistant hardfacing materials, and methods for applying abrasive wear resistant hardfacing materials to drill bits and drilling tools
US20080083568A1 (en) * 2006-08-30 2008-04-10 Overstreet James L Methods for applying wear-resistant material to exterior surfaces of earth-boring tools and resulting structures
US20080135304A1 (en) * 2006-12-12 2008-06-12 Baker Hughes Incorporated Methods of attaching a shank to a body of an earth-boring drilling tool, and tools formed by such methods
US20080156148A1 (en) * 2006-12-27 2008-07-03 Baker Hughes Incorporated Methods and systems for compaction of powders in forming earth-boring tools
US20080163723A1 (en) * 2004-04-28 2008-07-10 Tdy Industries Inc. Earth-boring bits
US20080202814A1 (en) * 2007-02-23 2008-08-28 Lyons Nicholas J Earth-boring tools and cutter assemblies having a cutting element co-sintered with a cone structure, methods of using the same
US7513320B2 (en) 2004-12-16 2009-04-07 Tdy Industries, Inc. Cemented carbide inserts for earth-boring bits
US20090308662A1 (en) * 2008-06-11 2009-12-17 Lyons Nicholas J Method of selectively adapting material properties across a rock bit cone
US20100000798A1 (en) * 2008-07-02 2010-01-07 Patel Suresh G Method to reduce carbide erosion of pdc cutter
US20100006345A1 (en) * 2008-07-09 2010-01-14 Stevens John H Infiltrated, machined carbide drill bit body
US7687156B2 (en) 2005-08-18 2010-03-30 Tdy Industries, Inc. Composite cutting inserts and methods of making the same
US7703556B2 (en) 2008-06-04 2010-04-27 Baker Hughes Incorporated Methods of attaching a shank to a body of an earth-boring tool including a load-bearing joint and tools formed by such methods
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US3248680A (en) * 1962-12-11 1966-04-26 Ward Leonard Electric Co Resistor
US3248679A (en) * 1962-12-11 1966-04-26 Ward Leonard Electric Co Metal alloy resistors
US3511622A (en) * 1965-10-12 1970-05-12 Milton A Nation Titanium wire and wire rope
US4167427A (en) * 1977-05-25 1979-09-11 Mitsubishi Jukogyo Kabushiki Kaisha Heat treatment of titanium alloys
US4149884A (en) * 1978-06-30 1979-04-17 The United States Of America As Represented By The Secretary Of The Air Force High specific strength polycrystalline titanium-based alloys
US4299626A (en) * 1980-09-08 1981-11-10 Rockwell International Corporation Titanium base alloy for superplastic forming
EP0163018A2 (en) * 1981-04-30 1985-12-04 Nissan Motor Co., Ltd. Method of welding titanium alloy parts with an insert member consisting essentially of 0 to 3% by weight of aluminium and the balance of titanium
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US4745977A (en) * 1985-04-12 1988-05-24 Union Oil Company Of California Method for resisting corrosion in geothermal fluid handling systems
US4898624A (en) * 1988-06-07 1990-02-06 Aluminum Company Of America High performance Ti-6A1-4V forgings
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