US3833363A - Titanium-base alloy and method of improving creep properties - Google Patents

Titanium-base alloy and method of improving creep properties Download PDF

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Publication number
US3833363A
US3833363A US00241286A US24128672A US3833363A US 3833363 A US3833363 A US 3833363A US 00241286 A US00241286 A US 00241286A US 24128672 A US24128672 A US 24128672A US 3833363 A US3833363 A US 3833363A
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alloy
silicon
titanium
silicon content
molybdenum
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US00241286A
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English (en)
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H Bomberger
S Seagle
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RMI Co
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RMI Co
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Priority to US00241286A priority Critical patent/US3833363A/en
Priority to CA166,903A priority patent/CA966334A/en
Priority to GB1573573A priority patent/GB1433371A/en
Priority to FR7311971A priority patent/FR2179055B1/fr
Priority to DE2316891A priority patent/DE2316891C2/de
Application granted granted Critical
Publication of US3833363A publication Critical patent/US3833363A/en
Priority to US05/812,881 priority patent/USRE29946E/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C14/00—Alloys based on titanium
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting

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  • the most common such alloy contains normally 6% aluminum, 2% tin, 4% zirconium and 2% molybdenum, and is known in the trade as the 6242 alloy.
  • Harris et a1 disclose a number of alloys of composition approaching the 6242 alloy, except that the alloys preferably contain about 0.1 to 2.0% silicon. Most of the alloys listed in the examples in the patent have a silicon content of 0.5%.
  • the apparent purpose of the patentees is to provide alloys which have improved creep properties; the patent does not discuss notch toughness.
  • An object of our invention is to provide a novel titanium-base alloy which contains alloying elements in a range similar to that described in the Peebles patent, but to which we add silicon in an amount to produce a silicon content in a narrow critical range above the residual level, whereby our alloy exhibits marked improvement over the 6242 alloy in tests for creep properties and stress rupture strength at elevated temperatures, without appreciable detriment to its other properties such as tensile strength, ductility or notch toughness.
  • a further object is to provide a method of improving the creep properties of an alloy otherwise similar to the Peebles alloy by adding silicon to the alloy in an amount to produce a silicon content in a narrow critical range above the residual level but below the range used in the prior art.
  • FIG. 1 is a graph showing the effect of silicon additions on the notch toughness of an alloy otherwise similar to the 6242 alloy.
  • FIG. 2 is a graph showing the effect of silicon additions on the creep and stress rupture strengths of an alloy otherwise similar to the 6242 alloy.
  • FIG. 3 is a graph showing the effect of silicon additions on the creep deformation of an alloy otherwise similar to the 6242 alloy.
  • the remainder of the alloy consists by weight of about 5.5 to aluminum, 1.7 to 2.3% tin, 0.7 to 5.0% zirconium, and 0.7 to 3.0% molybdenum, balance titanium and unavoidable impurities.
  • the preferred nominal analysis apart from silicon is similar to the commercial 6242 alloy, to wit 6% aluminum, 2% tin, 4% zirconium and 2% molybdenum, balance titanium.
  • the creep properties of the alloy fall off significantly as the silicon content is lowered nearer the residual level of 0.03%.
  • the upper limit of silicon in our alloy is defined by the level at which various properties, particularly notch toughness but surprisingly also creep, start to be affected detrimentally to an unacceptable degree.
  • Our tests show that the creep strength is maximum at a silicon content just below our upper limit, but the optimum silicon content of our alloy for a good combination of properties is about 0.08 to 0.09%. To demonstrate these phenomena, we performed a series of tests hereinafter described.
  • FIG. 1 shows graphically the effect of silicon on notch toughness. As long as the silicon content of the alloy does not exceed our upper limit of about 0.13%, the Charpy impact energy is not likely to drop below the generally acceptable minimum of 10 ft.-1bs.
  • FIG. 2 shows graphically results listed in Tables [11 and IV.
  • curve X we plot the average time to reach 0.1% deformation against silicon content. This curve shows a well-defined peak in the creep strength when the alloy has a silicon content of about 0.10%, but we prefer a slightly lower silicon content because other properties commence to be affected adversely at 0. silicon. Each point on the curve represents the average of at least two tests. The minimum acceptable time for 0.1% deformation under one current specification is 35 hours. The 6242 alloy, with only its residual silicon content, did not meet this specification, as indicated by point A on curve X. The alloy with a silicon content of 0.2% barely met this specification, as indicated by point B on the curve, but was deficient in other respects, as shown by the results of our notch toughness tests.
  • Curve Y in which we plot the time for rupture at l,000 F against silicon content, rises above the scale of the graph at our optimum silicon content, but thereafter drops precipitously.
  • FIG. 3 shows graphically additional information from Table III on the effect of silicon on creep deformation. This curve, in which we plot the permanent deformation at 100 hours against the silicon content, shows a minimum again near our optimum silicon content.
  • the points A and B in FIG. 3 correspond with the same points in FIG. 2.
  • a titanium-base alloy consisting by weight of about 5.5 to 6.5% aluminum, 1.7 to 2.3% tin, 0.7 to 5.0% zirconium, 0.7 to 3.0% molybdenum, silicon in an amount of at least 0.04% but less than 0.10%, and the balance titanium and unavoidable impurities, said alloy having a minimum Charpy V-notch impact energy of 10 ft.- lbs., and requiring a minimum time of 35 hours to reach 0.1% deformation when exposed to a stress of 35 Ksi at 950 F.
  • a method of improving the creep properties of a titanium base alloy which otherwise consists by weight of about 5.5 to 6.5% aluminum, 1.7 to 2.3% tin, 0.7 to 5.0% zirconium, 0.7 to 3.0% molybdenum, balance titanium and unavoidable impurities, and which has a residual silicon content of about 0.02 to 0.03%, said method comprising adding silicon to said alloy in an amount to produce a silicon content therein of at least 0.04% but less than 0.10% including the residual, whereby the alloy attains sufficient creep strength that specimens thereof require a minimum time of 35 hours to reach 0.1% deformation when exposed to a stress of 35 Ksi at 950 F, yet retain sufficient notch toughness to have a minimum Charpy V-notch impact energy of 10 ft.-lbs.-
  • a method as defined in claim 4 in which silicon is added to the alloy in an amount to produce a silicon content therein of 0.08 to 0.09%.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Forging (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Manufacture And Refinement Of Metals (AREA)
US00241286A 1972-04-05 1972-04-05 Titanium-base alloy and method of improving creep properties Expired - Lifetime US3833363A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00241286A US3833363A (en) 1972-04-05 1972-04-05 Titanium-base alloy and method of improving creep properties
CA166,903A CA966334A (en) 1972-04-05 1973-03-23 Titanium-base alloy and method of improving creep properties
GB1573573A GB1433371A (en) 1972-04-05 1973-04-02 Titanium-base alloy and method of improving its creep properties
FR7311971A FR2179055B1 (fr) 1972-04-05 1973-04-03
DE2316891A DE2316891C2 (de) 1972-04-05 1973-04-04 Verfahren zur Verarbeitung einer Titanlegierung
US05/812,881 USRE29946E (en) 1972-04-05 1977-07-05 Titanium-base alloy and method of improving creep properties

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US00241286A US3833363A (en) 1972-04-05 1972-04-05 Titanium-base alloy and method of improving creep properties

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CA (1) CA966334A (fr)
DE (1) DE2316891C2 (fr)
FR (1) FR2179055B1 (fr)
GB (1) GB1433371A (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4229216A (en) * 1979-02-22 1980-10-21 Rockwell International Corporation Titanium base alloy
US4253873A (en) * 1978-07-28 1981-03-03 Tokyo Shibaura Denki Kabushiki Kaisha Titanium-based alloy having high mechanical strength
US4309226A (en) * 1978-10-10 1982-01-05 Chen Charlie C Process for preparation of near-alpha titanium alloys
US4422887A (en) * 1980-09-10 1983-12-27 Imi Kynoch Limited Heat treatment
JPH01242743A (ja) * 1988-03-23 1989-09-27 Nkk Corp 耐熱チタン合金
US5922274A (en) * 1996-12-27 1999-07-13 Daido Steel Co., Ltd. Titanium alloy having good heat resistance and method of producing parts therefrom
US6245428B1 (en) 1998-06-10 2001-06-12 Cpfilms Inc. Low reflective films
US6284070B1 (en) * 1999-08-27 2001-09-04 General Electric Company Heat treatment for improved properties of alpha-beta titanium-base alloys
US10913991B2 (en) 2018-04-04 2021-02-09 Ati Properties Llc High temperature titanium alloys
US11001909B2 (en) 2018-05-07 2021-05-11 Ati Properties Llc High strength titanium alloys
US11268179B2 (en) 2018-08-28 2022-03-08 Ati Properties Llc Creep resistant titanium alloys

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1492262A (en) * 1975-05-07 1977-11-16 Imp Metal Ind Kynoch Ltd Titanium base alloy
CN113943877A (zh) * 2021-10-18 2022-01-18 忠世高新材料股份有限公司 一种Ti6242s合金铸锭的制备方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2893864A (en) * 1958-02-04 1959-07-07 Harris Geoffrey Thomas Titanium base alloys
US3049425A (en) * 1958-11-14 1962-08-14 Ici Ltd Alloys
US3343951A (en) * 1963-10-17 1967-09-26 Titanium Metals Corp Titanium base alloy
US3378368A (en) * 1965-01-04 1968-04-16 Imp Metal Ind Kynoch Ltd Titanium-base alloys
US3482968A (en) * 1967-08-08 1969-12-09 Titanium Metals Corp Titanium base alloys of high strength at atmospheric and elevated temperatures
US3619184A (en) * 1968-03-14 1971-11-09 Reactive Metals Inc Balanced titanium alloy
US3756810A (en) * 1972-04-04 1973-09-04 Titanium Metals Corp High temperature titanium alloy

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1156397A (en) 1963-10-17 1969-06-25 Contimet Gmbh Improved Titanium Base Alloy
DE1558461B1 (de) * 1966-06-20 1971-08-26 Contimet Gmbh Verwendung einer titanlegierung fuer gegenstaende die ein geringes spezifisches gewicht hochwarmfestigkeit kriech festigkeit gute zaehigkeit schweissbarkeit und verform barkeit erfordern und tieftemperaturbeanspruchungen stand halten

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2893864A (en) * 1958-02-04 1959-07-07 Harris Geoffrey Thomas Titanium base alloys
US3049425A (en) * 1958-11-14 1962-08-14 Ici Ltd Alloys
US3343951A (en) * 1963-10-17 1967-09-26 Titanium Metals Corp Titanium base alloy
US3378368A (en) * 1965-01-04 1968-04-16 Imp Metal Ind Kynoch Ltd Titanium-base alloys
US3482968A (en) * 1967-08-08 1969-12-09 Titanium Metals Corp Titanium base alloys of high strength at atmospheric and elevated temperatures
US3619184A (en) * 1968-03-14 1971-11-09 Reactive Metals Inc Balanced titanium alloy
US3756810A (en) * 1972-04-04 1973-09-04 Titanium Metals Corp High temperature titanium alloy

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
AFML TR 70 125, Development of a 900 F. Titanium Alloy, Russo et al., July 1970, pp. 5 33 & 84 89. *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4253873A (en) * 1978-07-28 1981-03-03 Tokyo Shibaura Denki Kabushiki Kaisha Titanium-based alloy having high mechanical strength
US4309226A (en) * 1978-10-10 1982-01-05 Chen Charlie C Process for preparation of near-alpha titanium alloys
US4229216A (en) * 1979-02-22 1980-10-21 Rockwell International Corporation Titanium base alloy
US4422887A (en) * 1980-09-10 1983-12-27 Imi Kynoch Limited Heat treatment
JPH01242743A (ja) * 1988-03-23 1989-09-27 Nkk Corp 耐熱チタン合金
US6284071B1 (en) 1996-12-27 2001-09-04 Daido Steel Co., Ltd. Titanium alloy having good heat resistance and method of producing parts therefrom
US5922274A (en) * 1996-12-27 1999-07-13 Daido Steel Co., Ltd. Titanium alloy having good heat resistance and method of producing parts therefrom
US6245428B1 (en) 1998-06-10 2001-06-12 Cpfilms Inc. Low reflective films
US6284070B1 (en) * 1999-08-27 2001-09-04 General Electric Company Heat treatment for improved properties of alpha-beta titanium-base alloys
US10913991B2 (en) 2018-04-04 2021-02-09 Ati Properties Llc High temperature titanium alloys
US11384413B2 (en) 2018-04-04 2022-07-12 Ati Properties Llc High temperature titanium alloys
US11001909B2 (en) 2018-05-07 2021-05-11 Ati Properties Llc High strength titanium alloys
US11674200B2 (en) 2018-05-07 2023-06-13 Ati Properties Llc High strength titanium alloys
US11268179B2 (en) 2018-08-28 2022-03-08 Ati Properties Llc Creep resistant titanium alloys
US11920231B2 (en) 2018-08-28 2024-03-05 Ati Properties Llc Creep resistant titanium alloys

Also Published As

Publication number Publication date
USRE29946E (en) 1979-03-27
FR2179055A1 (fr) 1973-11-16
DE2316891C2 (de) 1983-12-15
FR2179055B1 (fr) 1977-04-29
DE2316891A1 (de) 1973-10-18
GB1433371A (en) 1976-04-28
CA966334A (en) 1975-04-22

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