EP0117932A1 - Usinabilité à chaud d'un alliage à base de nickel, à durcissement par vieillissement - Google Patents

Usinabilité à chaud d'un alliage à base de nickel, à durcissement par vieillissement Download PDF

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Publication number
EP0117932A1
EP0117932A1 EP83301267A EP83301267A EP0117932A1 EP 0117932 A1 EP0117932 A1 EP 0117932A1 EP 83301267 A EP83301267 A EP 83301267A EP 83301267 A EP83301267 A EP 83301267A EP 0117932 A1 EP0117932 A1 EP 0117932A1
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EP
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Prior art keywords
percent
alloy
raw materials
parts per
per million
Prior art date
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EP83301267A
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German (de)
English (en)
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EP0117932B1 (fr
Inventor
Robert L. Mcguiness
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TDY Industries LLC
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Teledyne Industries Inc
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Application filed by Teledyne Industries Inc filed Critical Teledyne Industries Inc
Priority to DE8383301267T priority Critical patent/DE3372789D1/de
Priority to EP83301267A priority patent/EP0117932B1/fr
Priority to AT83301267T priority patent/ATE28668T1/de
Publication of EP0117932A1 publication Critical patent/EP0117932A1/fr
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Publication of EP0117932B1 publication Critical patent/EP0117932B1/fr
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/023—Alloys based on nickel

Definitions

  • This invention relates to a method for improving the hot workability of an age hardenable nickel base alloy and to an alloy having such improved hot workability properties.
  • One such alloy is commercially known by the designation U-720 and has the following nominal composition: about 18 percent chromium, about 5 percent titanium, about 2.5 percent aluminum, about 14.75 percent cobalt, about 3 percent molybdenum, about 1.25 percent tungsten, about .035 percent boron, about .035 percent carbon, about .037 percent zirconium, up to 0.1 percent columbium, up to 0.1 percent tantalum, up to 0.1 percent vanadium, up to 0.1 percent copper, up to .50 percent iron, up to .15 percent silicon, up to .15 percent manganese, up to 0.1 percent phosphorus, up to .0025 percent silver, up to .01 percent sulfur, and the balance nickel.
  • the present invention is based upon the discovery that significant improvements in the hot workability of certain age hardenable nickel base alloys can be achieved by deliberate additions of lime and magnesium under specified conditions during melting of the alloy.
  • This improvement is applicable to the production of the specific class of age hardenable nickel base alloys containing the following basic elements: 17 to 20 percent chromium, 2.9 to 5.3 percent titanium, 1.8 to 2.8 percent aluminum, 11 to 15.5 percent cobalt, 2.5 to 7 percent molybdenum, .8 to 1.5 percent tungsten, .004 to .040 percent boron, .02 to .06 percent carbon, and about 52 to about 57 percent nickel.
  • This class of alloys may also include minor amounts of other elements and incidental impurities including, but not limited to, up to .05 percent zirconium, up to 0.1 percent columbium, up to 0.1 percent tantalum, up to-0.1 percent vanadium, up to 0.1 percent copper, up to 2 percent iron, up to .15 percent silicon, up to .15 percent manganese, up to 0.1 percent phosphorus, up to 0.1 sulfur and up to .0025 percent silver.
  • the improvement provided in accordance with the present invention is particularly applicable to the age hardenable nickel base alloy known commercially as U-720; the specification of which calls for a composition as follows: 17.5 to 18.5 percent chromium, 4.75 to 5.25 percent titanium, 2.25 to 2.75 percent aluminum, 14 to 15.5 percent cobalt, 2.75 to 3.25 percent molybdenum, 1 to 1.5 percent tungsten, .03 to .04 percent boron, .03 to .04 percent carbon, .02 to .05 percent zirconium, up to 0.1 percent columbium, up to 0.1 percent tantalum, up to 0.1 percent vanadium, up to 0.1 percent copper, up to .5 percent iron, up to .15 percent silicon, up to .15 percent manganese, up to 0.1 percent phosphorus, up to .0025 percent silver, up to .01 percent sulfur, balance essentially nickel.
  • the improved hot workability and other desirable characteristics achieved in accordance with the present invention are believed to be attributable, at least in part, to the critical combination of magnesium and sulfur content provided in the alloy by the combined use of lime and magnesium addition in the melting operation.
  • Melting of the raw materials in the presence of lime, together with the addition of magnesium just prior to casting of the molten alloy, are believed to contribute to the hot workability of the alloy by removing and/or tying up sulfur present as an impurity in the raw materials.
  • the addition of lime to the molten raw materials is believed to result in removal of major quantities of the sulfur impurity.
  • the subsequent addition of magnesium is believed to further contribute to the hot workability properties by tying up significant amounts of sulfur which may remain in the alloy following the lime treatment.
  • magnesium be added to the molten raw materials under an inert gas back pressure and that the molten materials then be promptly poured from the furnace to form ingots.
  • alloys exhibiting improvements in hot workability pursuant to the lime and magnesium practice of this invention are characterized by a magnesium content within critical limits of from 10 to 100 parts per million and a sulfur content of no more than 50 parts per million.
  • the lime and magnesium practice is carried out in such a manner that the magnesium content is within the range of 10 to 60 parts per million and the sulfur content no more than 30 parts per million.
  • an age hardenable nickel base alloy which is characterized by excellent hot workability and which consists essentially of 17 to 20 percent chromium, 2.9 to 5.3 percent titanium, 1.8 to 2.8 percent aluminum, 11 to 15.5 percent cobalt, 2.5 to 7 percent molybdenum, .8 to 1.5 percent tungsten, .004 to .040 percent boron, .02 to .06 percent carbon, up to .05 percent zirconium, up to 0.1 percent columbium, up to 0.1 percent tantalum, up to 0.1 percent vanadium, up to 0.1 percent copper, up to 2 percent iron, up to .15 percent silicon, up to .15 percent manganese, up to 0.1 percent phosphorus, up to .025 percent silver, no more than 50 parts per million sulfur, from 10 to 100 parts per million magnesium, and the balance essentially nickel.
  • the improved alloy of this invention is further characterized by having excellent hot workability, as evidenced by a rapid strain rate hot ductility significantly greater than that of similar alloys without the lime and magnesium practice.
  • Hot workable alloys in accordance with this invention exhibit a rapid strain rate hot ductility at 17003 /4 F greater than 50 percent RA, and generally 60 percent RA or greater.
  • magnesium was added to the lime desulfurized heat under inert gas back pressure at the end of the refine cycle, just prior to pouring from the vacuum furnace. A very significant improvement in hot workability was observed.
  • the hot workability of the above-noted alloys was quantitatively measured by rapid strain rate hot tensile testing.
  • the specimens are first annealed at 2000 ⁇ 4 F. for one hour and air cooled.
  • Tensile specimens, machined from the material being studied, are heated to a series of test temperatures approximating the range normally employed in hot working.
  • the specimens are broken in tension, at a strain rate of approximately .05 inches per second.
  • the hot ductility is expressed as the percentage of reduction of area (%RA) of the broken bars, and this has been found to be a good indication of hot workability and to correlate well with actual results in hot rolling.
  • %RA percentage of reduction of area
  • Rapid strain rate hot ductility results from the above tests are displayed graphically in the figure.
  • the asterisk ( * ) represents the mean value of %RA and the shaded bar area indicates the range or spread of %RA, based on the standard deviation.
  • a significant improvement in %RA is apparent in the lime plus Mg practice of the present invention as compared to the non-lime/non-Mg practice and the lime/non-Mg practice.
  • the hot ductility of the lime plus Mg heats is actually better at 17001 ⁇ 4 F. than the non-Mg heats are at 18001/ 4 F., a 1001 ⁇ 4 F. or greater improvement which is of tremendous significance in hot working.
  • yield Another measure of the improvement in hot workability observed for the lime plus M g composition is yield. This is a'measure of the amount of final bar product shipped expressed as a percentage of the amount of the starting material. Yield figures accumulated on lime plus Mg heats show a 34 percent increase over lime/non-Mg heats.
  • lime plus Mg composition over the lime/non-Mg composition was a dramatic reduction in the frequency of sonic indications found in finish centerless ground bar product.
  • Lime plus Mg heats average slightly less than one (1) sonic defect per ingot while lime/non-Mg heats had more than four (4) sonic defects per ingot.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Adornments (AREA)
  • Laminated Bodies (AREA)
  • Materials For Medical Uses (AREA)
EP83301267A 1983-03-08 1983-03-08 Usinabilité à chaud d'un alliage à base de nickel, à durcissement par vieillissement Expired EP0117932B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE8383301267T DE3372789D1 (en) 1983-03-08 1983-03-08 Improving the hot workability of an age hardenable nickel base alloy
EP83301267A EP0117932B1 (fr) 1983-03-08 1983-03-08 Usinabilité à chaud d'un alliage à base de nickel, à durcissement par vieillissement
AT83301267T ATE28668T1 (de) 1983-03-08 1983-03-08 Warmbearbeitbarkeit einer nickelbasislegierung mit struktureller haertung.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83301267A EP0117932B1 (fr) 1983-03-08 1983-03-08 Usinabilité à chaud d'un alliage à base de nickel, à durcissement par vieillissement

Publications (2)

Publication Number Publication Date
EP0117932A1 true EP0117932A1 (fr) 1984-09-12
EP0117932B1 EP0117932B1 (fr) 1987-07-29

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EP83301267A Expired EP0117932B1 (fr) 1983-03-08 1983-03-08 Usinabilité à chaud d'un alliage à base de nickel, à durcissement par vieillissement

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EP (1) EP0117932B1 (fr)
AT (1) ATE28668T1 (fr)
DE (1) DE3372789D1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7491541B2 (en) 2006-09-21 2009-02-17 Kci Licensing, Inc. Method for quantitation of collagen in tissue

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1035250A (en) * 1962-12-04 1966-07-06 Westinghouse Electric Corp Purification of alloys
GB1180974A (en) * 1966-07-25 1970-02-11 Int Nickel Ltd Treatment of Nickel-Chromium Alloys
US3575734A (en) * 1968-07-26 1971-04-20 Carpenter Technology Corp Process for making nickel base precipitation hardenable alloys
US3850624A (en) * 1973-03-06 1974-11-26 Howmet Corp Method of making superalloys
FR2262120A1 (fr) * 1974-02-27 1975-09-19 Special Metals Corp
US3907552A (en) * 1971-10-12 1975-09-23 Teledyne Inc Nickel base alloys of improved properties
US4376650A (en) * 1981-09-08 1983-03-15 Teledyne Industries, Inc. Hot workability of an age hardenable nickle base alloy

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1035250A (en) * 1962-12-04 1966-07-06 Westinghouse Electric Corp Purification of alloys
GB1180974A (en) * 1966-07-25 1970-02-11 Int Nickel Ltd Treatment of Nickel-Chromium Alloys
US3575734A (en) * 1968-07-26 1971-04-20 Carpenter Technology Corp Process for making nickel base precipitation hardenable alloys
US3907552A (en) * 1971-10-12 1975-09-23 Teledyne Inc Nickel base alloys of improved properties
US3850624A (en) * 1973-03-06 1974-11-26 Howmet Corp Method of making superalloys
FR2262120A1 (fr) * 1974-02-27 1975-09-19 Special Metals Corp
US4376650A (en) * 1981-09-08 1983-03-15 Teledyne Industries, Inc. Hot workability of an age hardenable nickle base alloy

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
METALS ABASTRACTS, vol. 12, page 50, abstract no. 31-2524 *

Also Published As

Publication number Publication date
ATE28668T1 (de) 1987-08-15
DE3372789D1 (en) 1987-09-03
EP0117932B1 (fr) 1987-07-29

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