Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
  • C22C27/04—Alloys based on tungsten or molybdenum
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
  • C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
  • C22C32/0052—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides

Definitions

• tungsten-base alloys which contain small additions of carbon and reactive metals selected from the group consisting of hafnium, zirconium and titanium. These ternary alloys contain between 0.004 and 0.05 percent carbon and between 0.01 and 2.0 percent reactive metal, the balance being tungsten. By varying the constituents within the specified ranges the best combination of mechanical properties and ease of fabricability may be obtained for a given application.
• the alloys may also be consolidated by other processes such as vacuum arc-casting. Fabrication may be accomplished by other techniques such as extruding, forging or drawing to produce the desired wrought form. Measurements of ultimate tensile strength, stress-rupture strength, recrystallization temperature and ductile-to-brittle transition temperature were carried out for a number of alloys.
• the recrystallization temperature was established by determining at what temperature the fibrous structure of the Wrought alloy completely disappeared and recrystallization Was essentially complete.
• the ductile-to-brittle transition temperature was measured by bending a wrought sample over a radius four times the thickness of the sheet through a angle at several temperatures and determining the minimum temperature at which deformation occurred without cracking. Characteristics of wrought tungsten-hafnium-carbon alloys of different compositions are shown in Table I.
• the temperature above which the alloy becomes substantially ductile (the brittle-to-ductile transition temperature) is equal to or less than that for unalloyed tungsten.
• the high strengths and high recrystallization temperatures obtained in the tungsten-reactive metal-carbon alloys are due to the formation, during fabrication, of a uniformly dispersed reactive metal carbide having particle sizes pre- 65 By contrast, the following values are reported for un- 0 alloyed tungsten:
• Carbon base alloys containing 0.15 to 1.0 hafnium and 0.015 to 0.035 carbon exhibit an optimum combination of ultimate tensile strength, recrystallization temperature, ductile-to-brittle transition temperature and fabricability.
• EXAMPLE II An alloy consisting of tungsten, zirconium, and carbon was prepared by the method described for the alloy of consistent with desired mechanical properties have been found most suitable.
• Example II gives the characteristics of various 5 shall be interpreted as illustrative and not in a limiting compositions of this alloy. sense.
• Carbon base alloys containing 0.05 to 0.5 percent zirconium and 0.01 to 0.025 percent carbon exhibit a highly desirable combination of ultimate tensile strength, recrystallization temperature, ductile-to-brittle transition temperature and fabricability.
• EXAMPLE III An alloy consisting of 0.24 percent titanium, 0.027 percent carbon with the balance tungsten was prepared by the method of Example I. This alloy has the following and 150 C.
• a tungsten-base alloy consisting essentially of between 0.004 and 0.05 percent carbon and between 0.01 and 0.45 percent zirconium, the balance being tungsten.
• a tungsten-base alloy consisting essentially of between 0.01 and 0.025 percent carbon and between 0.05 and 0.45 percent zirconium, the balance being tungsten.
• a tungsten-base alloy consisting essentially of approximately 0.027 percent carbon and approximately 0.24 percent titanium, the balance being tungsten.
• a tungsten-base alloy consisting essentially of between 0.004 and 0.05 percent carbon and between 0.01 and 0.45 percent zirconium, the balance being tungsten, said alloy having uniformly dispersed zirconium carbide particles distributed therein, the size of said particles being predominantly in the range 200 to 1000 Angstroms.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Powder Metallurgy (AREA)

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Cited By (9)

Citations (3)

• 1963
  • 1963-10-29 US US319688A patent/US3243291A/en not_active Expired - Lifetime
• 1964
  • 1964-10-28 AT AT914264A patent/AT251895B/de active
  • 1964-10-28 LU LU47228A patent/LU47228A1/xx unknown
  • 1964-10-28 BE BE654936D patent/BE654936A/xx unknown
  • 1964-10-29 CH CH1400564A patent/CH418652A/fr unknown
  • 1964-10-29 SE SE13044/64A patent/SE306430B/xx unknown

Patent Citations (3)

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