Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/16—Changing 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
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C25/00—Alloys based on beryllium

Definitions

• the present invention relates to a process for improving the mechanical characteristics of objects consisting of beryllium or beryllium alloy.
• beryllium is a metal which is generally employed for the production of alloys. It is also used to produce casings for fuel elements of nuclear reactors.
• the present invention concerns a thermo-mechanical treatment which produces an improvement.
• the process according to the present invention is characterised in that there is imparted to the object, which is brought to a temperature close to its recrystallisation tem-' perature, a low permanent deformation, generally below that of the critical cold Working at this temperature, for a period such that there is obtained a considerable relief of the initial internal stress resulting from the imparted deformation, whereafter the object is allowed to cool.
• the deformation may be imparted particularly by trac tion, compression, torsion or bending.
• thermo-mechanical treatment produces a change in the structure of the metal and in its mechanical characteristics.
• Temperatgre test E 0.2 kgJmm. A percent 3,350,241 Patented Oct. 31, 1967 It will be seen on comparing the two foregoing tables that the ductility of the metal treated is increased throughout the temperature range and is quintupled at 600 C. The value of the elastic limit at 600 C. is doubled in relation to that of the original metal.
• the aforesaid complete stress relief phase is an essential condition of the treatment. If this condition is not satisfied, the characteristics of the metal are not modified.
• the treatment according to the invention is applicable to various structural states: rough extruded or rolled state, whether recrystallised or not, with or without preheating treatment.
• the treatment according to the invention may be industrially applied to various products and in particular to tubes intended for the production of casings for nuclear reactors.
• This straightening may be effected by traction applied under the following conditions:
• a process for improving the mechanical characteristics of sheets, bars and tubes of beryllium and beryllium alloys comprising the steps of heating them to a temperature approaching the recrystallization temperature of about 600 C., then applying a low permanent deformation of approximately 0.2% thereto below that of critical cold working for this temperature for a period of approximately 15 minutes whereby a considerable relief of the initial internal stress resulting from the imparted deformation is obtained and then cooling them.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Heat Treatment Of Articles (AREA)
• Heat Treatment Of Steel (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=8814070

Family Applications (1)

Country Status (11)

Cited By (1)

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Citations (2)

Family Cites Families (1)

• 1963
  • 1963-10-10 FR FR950126A patent/FR1381387A/fr not_active Expired
• 1964
  • 1964-09-30 NL NL6411373A patent/NL6411373A/xx unknown
  • 1964-10-01 CH CH1275864A patent/CH425244A/fr unknown
  • 1964-10-01 US US400902A patent/US3350241A/en not_active Expired - Lifetime
  • 1964-10-02 IL IL22178A patent/IL22178A/en unknown
  • 1964-10-02 GB GB40286/64A patent/GB1056255A/en not_active Expired
  • 1964-10-03 LU LU47077A patent/LU47077A1/xx unknown
  • 1964-10-05 BE BE653981D patent/BE653981A/xx unknown
  • 1964-10-09 DE DEC34063A patent/DE1215941B/de active Pending
  • 1964-10-09 SE SE12144/64A patent/SE301727B/xx unknown
  • 1964-10-10 ES ES0304826A patent/ES304826A1/es not_active Expired

Patent Citations (2)

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