US3420717A - Metal softening process and product thereof - Google Patents

Metal softening process and product thereof Download PDF

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Publication number
US3420717A
US3420717A US537939A US3420717DA US3420717A US 3420717 A US3420717 A US 3420717A US 537939 A US537939 A US 537939A US 3420717D A US3420717D A US 3420717DA US 3420717 A US3420717 A US 3420717A
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temperature
eutectoid
stock
forming
working
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US537939A
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English (en)
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Davis S Fields Jr
Daniel L Mehl
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International Business Machines Corp
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International Business Machines Corp
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C18/00—Alloys based on zinc
    • C22C18/04—Alloys based on zinc with aluminium as the next major constituent
    • 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
    • C22F1/165—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 of zinc or cadmium or alloys based thereon
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S420/00—Alloys or metallic compositions
    • Y10S420/902—Superplastic

Definitions

  • Strain rate sensitivity m is the exponential variable in the expression wherein 11 represents stress in pounds per unit area; Erepresents strain rate in terms of length change per unit guage length per unit time; and K represents a proportionality constant which may be termed the strain rate coefficient. The numerical value of K depends upon the specific dimensions selected for the other variables.
  • Another object of our invention has been to investigate the effect of typical expected variations in our process to permit the generalization necessary to practical utilization of this process on other alloys related functionally to the pure zinc-aluminum eutectoid, and to permit predictable variations in the process itself.
  • FIGURES 1(a), 1(b) and 1(0) are schematic views of the principal steps of our process
  • FIGURE 2 is a data plot of true stress 0' vs. true strain rate 5, for differently preconditioned materials
  • FIGURE 3 is a data plot of forming depth vs. forming time for differently preconditioned materials when subjected to a standardized part-forming operation involving biaxial tension;
  • FIGURE 4 is a data plot of forming depth vs. forming time similar to FIGURE 3 from tests of materials pre- 3,420,717 Patented Jan. 7, 1969 ice conditioned at different temperatures t demonstrate the optimum working temperature and the effect of variations therefrom;
  • FIGURE 5 is a cross plot of data taken from the curve end points of FIGURE 4, more vividly illustrating the significance thereof;
  • FIGURE 6 is a comparative data plot of instantaneous load as produced by a standard applied strain rate to specimens of varying zinc-aluminum content.
  • FIGURES 7 and 8 are data plots of forming depth vs. forming time similar to FIGURE 3 from tests to other alloys differing from the substantially pure eutectoid to demonstrate the beneficial effect of our conditioning process thereon.
  • stock material 10 having the highly desirable but unexpected property of low strength at superplastic forming temperatures as compared with material prepared without the working step.
  • the conditioned stock material is identifiable by its substantially reduced strain rate coefficient K at forming temperatures.
  • the decreased strength level of the material permits improvement of the final forming process, either by reducing the loads required, the time required, or some combination of these two primary expense factors.
  • FIGURE 2 is a graphical log-log representation of data obtained from uniaxial tensile testing at 520 F. of specimens having different degrees of low temperature working, when tested over a wide range of strain rates More specifically, curve 20 represents the tensile response of a standardized specimen having no low temperature working after the quench stage 12. Curves 21, 22 and 23 represent data taken from standardized specimens having, respectively, 25, 50 and reduction by low tem perature working in accordance with our process.
  • FIGURE 3 is a data plot, graphically illustrating the following practical part forming demonstration which had been performed.
  • Four sheet specimens were taken from the same section of a common melt provided in the form of reroll stock of an alloy comprising 78% zinc, 22% aluminum, by weight to an accuracy of 99.0% purity.
  • the material for each sheet was rolled at 620 F. to a thickness that would permit various degrees of later low temperature working to an ultimate standard thickness of 0.050 inch. All sheets were solution heat-treated at about 600 F. for approximately one hour and then quenched in water with agitation to produce an essentially equal metallurgical state.
  • One sheet was employed as a control and was not worked further after the quench.
  • Each of the remaining sheets was rolled at about room temperature to reduce its thickness by 25, 50 and 75 percent, respectively, producing final specimens of 0.050 inch thickness in each case.
  • Each specimen was placed in a heated die, constructed like that described in the aforementioned application Ser. No. 445,188, and brought to a uniform temperature of 520 F. in a standardized period of sixteen minutes.
  • a pneumatic load by way of a 14.7 p.s.i. vacuum was applied to each specimen.
  • the time and center point deflection data plotted in FIGURE 3 was recorded during each test.
  • the response of the control specimen is plotted as curve in FIGURE 3.
  • the response of the specimens worked by 25, and 75% thickness reduction is plotted as respective curves 31, 32 and 33.
  • the control specimen (curve 30) required a forming time of 3.4 minutes for the center point to reach the bottom of the die.
  • the specimen reduced by 50% (curve 32) required 1.2 minutes for total deflection.
  • the specimen reduced by 75% (curve 33) required only 1.1 minutes for total deflection. It can be seen that good correspondence exists between FIGURES 2 and 3. It also can be seen that the effect of our working step on the strength reduction at forming temperature decreases with further working.
  • Data plotted in FIGURE 4 was obtained by preparing six test sheet specimens of the zinc-aluminum euctectoid from the same part of the same melt by 'hot rolling ingot (above 600 F.) to 0.100 inch, solution heat treating the specimens for one hour at 600 F. and quenching the specimen in water, with agitation.
  • the specimens were individually heated a selected temperature (100, 200, 300, 400, 500, 600 F.) and rolled to 0.050 inch, a deformation of 50%. After rolling, each specimen was quenched. The rolling required several passes and the specimens were returned to the heating oven between passes to maintain as nearly a constant temperature as possible.
  • the specimen rolled at 600 F. was considered a control since this temperature is above the eutectoid invariant.
  • the control specimen was given the same rolling history as the test specimens, but as expected, it behaved as if all rolling had occurred prior to the first quench.
  • Material composition can vary, as with random impurities, significant alloy additions, or off-eutectoid composition and significant softening effect is still obtained by processing in accordance with our invention.
  • FIGURE 6 shows the effect on the benefits of our process of relative zinc-aluminum variation over a wide range around the eutectoid (78%22%) composition.
  • Curve 60 plots the instantaneous load for a tensile specimen subjected to a standard strain rate for various compositions, but without previous low temperatures working according to our invention.
  • Curve 61 plots the forming load for the same compositions, as curve 60, but with 50% low temperature deformation after quenching. The continued benefit of our process over this wide range of composition variation is manifest.
  • FIGURES 7 and 8, respectively, show the continued benefit of our process in the presence of small but significant amounts of magnesium and manganese.
  • FIG- URE 7 shows the response of comparative 50% low temperature worked (curve 70) and unworked (curve 71) test specimens, containing 0.02% mg. by weight, tested as described in connection with FIGURE 3.
  • FIGURE 8 shows the response of comparative 50% low temperature worked (curve 80) and unworked (curve 81) test specimens containing 0.050% Mn.
  • heating while conventionally performed in an enclosed oven can with equal etficiency, be performed in a heated press designed to provide the working desired. Quenching can be accomplished by spraying as opposed to dunking and the working can be accomplished by extrusion, forging, etc., as well as rolling.
  • a method of making metal forms comprising the steps of:
  • a method of making metal forms comprising the steps of:
  • a method of making metal forms comprising the steps of:
  • a body of metal alloy stock of the eutectoid comprising nominally 78% zinc, 22% aluminum by weight, said body being in a state resulting from processing in accordance With the process defined in claim 1, said body being characterized by exhibiting a substantially reduced strain rate coeflicient at temperatures just below its eutectoid temperature, as compared to a body of the same alloy similarly processed but without said working step.
  • a body of metal alloy stock of the eutectoid comprising nominally 78% zinc, 22% aluminum by weight, said body being in a state resulting from processing in accordance with the process defined in claim 2, said body being characterized by exhibiting a substantially reduced strain rate coefiicient at temperatures just below its eutectoid temperature, as compared to a body of the same alloy similarly processed but Without said working step.
  • a body of metal alloy stock of the eutectoid comprising nominally 78% zinc, 22% aluminum by weight, said body being in a state resulting from processing in accordance with the process defined in claim 3, said body being characterized by exhibiting a substantially reduced strain rate coeflicient at temperatures just below its eutectoid temperature, as compared to a body of the same alloy similarly processed but without said rolling step,
US537939A 1966-03-28 1966-03-28 Metal softening process and product thereof Expired - Lifetime US3420717A (en)

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US (1) US3420717A (fr)
JP (1) JPS4920454B1 (fr)
AT (1) AT271922B (fr)
BE (1) BE693841A (fr)
CH (1) CH492796A (fr)
CS (1) CS158607B2 (fr)
DE (1) DE1558785B2 (fr)
DK (1) DK135899B (fr)
ES (1) ES338523A1 (fr)
FR (1) FR1512991A (fr)
GB (1) GB1125072A (fr)
NL (1) NL150166B (fr)
PL (1) PL79095B1 (fr)
SE (1) SE315132B (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3595060A (en) * 1968-03-21 1971-07-27 Pressed Steel Fisher Ltd Method of forming metal alloys
US3632454A (en) * 1970-03-20 1972-01-04 Ibm Process for inducing superplasticity in zinc or zinc-aluminum alloys containing copper
US3753791A (en) * 1970-01-01 1973-08-21 Imp Smelting Corp Ltd Heat-treatment of zinc/aluminium alloys
US3793091A (en) * 1971-08-20 1974-02-19 Noranda Mines Ltd Superplastic conditioning of ternary and quaternary zinc-aluminum alloys
US3804677A (en) * 1971-11-04 1974-04-16 Isc Alloys Ltd Working of alloys
US3920175A (en) * 1974-10-03 1975-11-18 Rockwell International Corp Method for superplastic forming of metals with concurrent diffusion bonding
US3972743A (en) * 1975-10-20 1976-08-03 Ball Corporation High strength, stable zinc-aluminum alloy
US4040286A (en) * 1975-10-09 1977-08-09 St. Joe Minerals Corporation High-precision, fine-detail forging process
US4137105A (en) * 1977-06-20 1979-01-30 Gulf & Western Industries, Inc. Method of forming tooling for superplastic metal sheet
US4460657A (en) * 1981-03-20 1984-07-17 The Boeing Company Thinning control in superplastic metal forming
EP0219280A2 (fr) * 1985-10-07 1987-04-22 Ristvedt-Johnson, Inc. Méthode et appareil pour former et envelopper un rouleau de pièces de monnaie

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3706605A (en) * 1970-10-05 1972-12-19 St Joe Minerals Corp Superplastic lead alloys
JPS5214372A (en) * 1975-07-25 1977-02-03 Hitachi Ltd Pinching tool of the semiconducter wafer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3340101A (en) * 1965-04-02 1967-09-05 Ibm Thermoforming of metals

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3340101A (en) * 1965-04-02 1967-09-05 Ibm Thermoforming of metals

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3595060A (en) * 1968-03-21 1971-07-27 Pressed Steel Fisher Ltd Method of forming metal alloys
US3753791A (en) * 1970-01-01 1973-08-21 Imp Smelting Corp Ltd Heat-treatment of zinc/aluminium alloys
US3632454A (en) * 1970-03-20 1972-01-04 Ibm Process for inducing superplasticity in zinc or zinc-aluminum alloys containing copper
US3793091A (en) * 1971-08-20 1974-02-19 Noranda Mines Ltd Superplastic conditioning of ternary and quaternary zinc-aluminum alloys
US3804677A (en) * 1971-11-04 1974-04-16 Isc Alloys Ltd Working of alloys
US3920175A (en) * 1974-10-03 1975-11-18 Rockwell International Corp Method for superplastic forming of metals with concurrent diffusion bonding
US4040286A (en) * 1975-10-09 1977-08-09 St. Joe Minerals Corporation High-precision, fine-detail forging process
US3972743A (en) * 1975-10-20 1976-08-03 Ball Corporation High strength, stable zinc-aluminum alloy
US4137105A (en) * 1977-06-20 1979-01-30 Gulf & Western Industries, Inc. Method of forming tooling for superplastic metal sheet
US4460657A (en) * 1981-03-20 1984-07-17 The Boeing Company Thinning control in superplastic metal forming
EP0219280A2 (fr) * 1985-10-07 1987-04-22 Ristvedt-Johnson, Inc. Méthode et appareil pour former et envelopper un rouleau de pièces de monnaie
EP0219280A3 (en) * 1985-10-07 1989-03-01 Ristvedt-Johnson, Inc. Wrapped coin roll and method and apparatus for forming same

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Publication number Publication date
DE1558785A1 (fr) 1971-07-29
GB1125072A (en) 1968-08-28
FR1512991A (fr) 1968-02-09
DK135899C (fr) 1977-12-12
DK135899B (da) 1977-07-11
NL6703717A (fr) 1967-09-29
PL79095B1 (fr) 1975-06-30
BE693841A (fr) 1967-07-17
DE1558785B2 (de) 1971-07-29
AT271922B (de) 1969-06-25
CH492796A (de) 1970-06-30
SE315132B (fr) 1969-09-22
ES338523A1 (es) 1968-10-01
CS158607B2 (fr) 1974-11-25
JPS4920454B1 (fr) 1974-05-24
NL150166B (nl) 1976-07-15

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