US3350241A - Process for improving the mechanical characteristics of objects consisting of beryllium or beryllium alloy - Google Patents

Process for improving the mechanical characteristics of objects consisting of beryllium or beryllium alloy Download PDF

Info

Publication number
US3350241A
US3350241A US400902A US40090264A US3350241A US 3350241 A US3350241 A US 3350241A US 400902 A US400902 A US 400902A US 40090264 A US40090264 A US 40090264A US 3350241 A US3350241 A US 3350241A
Authority
US
United States
Prior art keywords
beryllium
mechanical characteristics
improving
objects consisting
alloy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US400902A
Inventor
Mallen Jose
Weisz Michel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Application granted granted Critical
Publication of US3350241A publication Critical patent/US3350241A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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.

Landscapes

  • 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)

Description

United States Patent 3,350,241 PROCESS FOR IMPROVING THE MECHANICAL CHARACTERISTICS OF OBJECTS CONSISTING 0F BERYLLIUM 0R BERYLLIUM ALLOY Jos Mallen, Paris, and Michel Weisz, Orsay, France, as-
signors to Commissariat a IEnergie Atomique, Paris, France No Drawing. Filed Oct. 1, 1964, Ser. No. 400,902 Claims priority, application France, Oct. 10, 1963, 950,126 1 Claim. (Cl. 148-115) The present invention relates to a process for improving the mechanical characteristics of objects consisting of beryllium or beryllium alloy.
It is known that 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.
Under the operating conditions of such a use, it is im portant to improve the mechanical characteristics of this metal and notably its elastic limit at elevated temperature and its ductility.
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.
The above defined thermo-mechanical treatment produces a change in the structure of the metal and in its mechanical characteristics.
By way of example, there will be mentioned an application of the process to beryllium sheet whose initial characteristics, determined by tensile tests, are the following where E is the elastic limit of the metal and A is the ductility of the metal expressed as relative extension:
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.
It is to be noted that 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.
In particular, it may be used for straightening rough cold worked tubes. This straightening may be effected by traction applied under the following conditions:
(a) The stress applied must involve an imparted deformation, for example, 'by means of a screw system, and not an imparted force;
(b) The temperature and duration conditions depend only upon one factor: production of complete relief of the initial tension;
(c) The deformation to be imparted in this case will be a compromise between that necessary for straightening the tube and the optimum deformation determined in each particular case by preliminary tests.
We claim:
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.
References Cited FOREIGN PATENTS 5/=1961 Great Britain. 2/ 1963 Great Britain.
OTHER REFERENCES DAVID L. RE'CK, Primary Examiner. H. F. 'SAITO, Assistant Examiner.
US400902A 1963-10-10 1964-10-01 Process for improving the mechanical characteristics of objects consisting of beryllium or beryllium alloy Expired - Lifetime US3350241A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR950126A FR1381387A (en) 1963-10-10 1963-10-10 Process for improving the mechanical characteristics of objects made of beryllium or beryllium alloy

Publications (1)

Publication Number Publication Date
US3350241A true US3350241A (en) 1967-10-31

Family

ID=8814070

Family Applications (1)

Application Number Title Priority Date Filing Date
US400902A Expired - Lifetime US3350241A (en) 1963-10-10 1964-10-01 Process for improving the mechanical characteristics of objects consisting of beryllium or beryllium alloy

Country Status (11)

Country Link
US (1) US3350241A (en)
BE (1) BE653981A (en)
CH (1) CH425244A (en)
DE (1) DE1215941B (en)
ES (1) ES304826A1 (en)
FR (1) FR1381387A (en)
GB (1) GB1056255A (en)
IL (1) IL22178A (en)
LU (1) LU47077A1 (en)
NL (1) NL6411373A (en)
SE (1) SE301727B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4017333A (en) * 1975-08-25 1977-04-12 Lockheed Missiles & Space Company, Inc. Fine grain beryllium bodies

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2191843B (en) * 1986-06-12 1989-12-20 Hollingsworth Uk Ltd Vibration damper

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB868064A (en) * 1958-02-13 1961-05-17 Atomic Energy Authority Uk Extrusion and drawing of beryllium
GB919423A (en) * 1960-10-04 1963-02-27 Atomic Energy Authority Uk Metallurgical process for working beryllium

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2872363A (en) * 1948-07-14 1959-02-03 Robert E Macherey Method of working beryllium

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB868064A (en) * 1958-02-13 1961-05-17 Atomic Energy Authority Uk Extrusion and drawing of beryllium
GB919423A (en) * 1960-10-04 1963-02-27 Atomic Energy Authority Uk Metallurgical process for working beryllium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4017333A (en) * 1975-08-25 1977-04-12 Lockheed Missiles & Space Company, Inc. Fine grain beryllium bodies

Also Published As

Publication number Publication date
NL6411373A (en) 1965-04-12
GB1056255A (en) 1967-01-25
DE1215941B (en) 1966-05-05
SE301727B (en) 1968-06-17
CH425244A (en) 1966-11-30
LU47077A1 (en) 1964-12-03
FR1381387A (en) 1964-12-14
BE653981A (en) 1965-02-01
ES304826A1 (en) 1966-11-01
IL22178A (en) 1968-01-25

Similar Documents

Publication Publication Date Title
US3826124A (en) Manufacture of tubes with improved metallic yield strength and elongation properties
CA2038383C (en) Zircaloy-4 processing for uniform and nodular corrosion resistance
US3645800A (en) Method for producing wrought zirconium alloys
CH682326A5 (en)
KR930019842A (en) Zirro Alloy and Manufacturing Method
GB997761A (en) Improvements relating to zirconium base alloys
US3350241A (en) Process for improving the mechanical characteristics of objects consisting of beryllium or beryllium alloy
DE69013989T2 (en) Zircaloy tube with single crown radial texture.
US3053703A (en) Producing high strengths in martensitic steels
GB988069A (en) Improvements in or relating to zirconium-base alloys
US3337372A (en) Process for improving properties of zirconium metal
DE1558687A1 (en) Process for improving the strength and elongation of steel
US5242515A (en) Zircaloy-4 alloy having uniform and nodular corrosion resistance
US3669759A (en) Thermomechanical treatment for improving ductility of carbide-stabilized austenite stainless steel
US3194693A (en) Process for increasing mechanical properties of titanium alloys high in aluminum
US3333994A (en) Process for the manufacture of products of beryllium or beryllium alloy
US3732126A (en) Treatment of metals
US5223053A (en) Warm work processing for iron base alloy
US3513037A (en) Method of refining the structure of superplastic zinc base alloys
JPS6425933A (en) Aluminum foil for packing
US3089768A (en) Dimensionally stable, corrosion resistant nuclear fuel
US2384351A (en) Method of forming extended lengths of metal wire
GB1541072A (en) Method of heat-treating cold worked austenitic steels
RU1822442C (en) Method for processing alloy of aluminium-copper-lithium system
SU143825A1 (en) The method of thermomechanical processing of metals and alloys