EP0091279A1 - Elément de construction en alliage à base de nickel et procédé pour sa fabrication - Google Patents

Elément de construction en alliage à base de nickel et procédé pour sa fabrication Download PDF

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Publication number
EP0091279A1
EP0091279A1 EP83301811A EP83301811A EP0091279A1 EP 0091279 A1 EP0091279 A1 EP 0091279A1 EP 83301811 A EP83301811 A EP 83301811A EP 83301811 A EP83301811 A EP 83301811A EP 0091279 A1 EP0091279 A1 EP 0091279A1
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EP
European Patent Office
Prior art keywords
alloy
plastic working
corrosion cracking
subjecting
cold plastic
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EP83301811A
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German (de)
English (en)
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EP0091279B1 (fr
Inventor
Yoshinao Urayama
Shigeo Hattori
Isao Masaoka
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Hitachi Ltd
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Hitachi Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
    • 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
    • C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon

Definitions

  • the springs particularly springs for nuclear reactors such as expansion spring incorporated in the control rod drives of a boiling water reactor (BWR), are often used in places where crevices exist under application of high level of stress.
  • the countermeasure against SCC therefore, is essential for such springs.
  • the spring blank formed from this material is subjected to a cold working at working ratio of 30 to 40% after having been subjected to a solution heat treatment, and then subjected to a direct aging treatment.
  • the cold working after the solution heat treatment is conducted for giving a final shape to the spring.
  • the aging treatment following the cold working contributes to the improvement in the spring property and strength at high temperature essential for the springs used in nuclear reactors.
  • Japanese Patent Application Laid-Open No. 69517/79 mentions about the intergranular corrosion in solid solution hardening alloy but does not mention at all about the SCC resistance of precipitation hardening alloy. Unlike the solid solution hardening alloy, the- precipitation hardening alloy does not exhibit any specific relationship between the crevice SCC suscep- . tibility and the intergranular corrosion susceptibility.
  • an object of the invention is to provide an Ni-base alloy member having a superior SCC resistance, as well as a method of producing the same, thereby to overcome the above-described problems of the prior art.
  • the crevice SCC resistance is increased when the cold plastic working is conducted at a working ratio of 40%. It proved also that this alloy has precipitate of discontinuous and granular Cr carbide in the grain boundary.
  • the conventional process increases the SCC susceptibility due to continuous precipitate of Cr carbide in the grain boundary. Therefore, the cold working ratio should be not smaller than 40% in terms of reduction of cross-sectional area.
  • an Ni-base alloy member superior in stress corrosion cracking resistance made of an alloy consisting essentially of, by weight, 14 to 25% of Cr, not greater than 30% of Fe, 0.2 to 2% of Al, 0.5 to 3% of Ti, 0.7 to 4.5% of Nb and the balance substantially Ni, characterized in that the alloy exhibits stress corrosion cracking depth of not greater than 200pm when subjected to pure water of 288°C under a pressure of 86 K g/cm 2 and having a dissolved oxygen content of 8 ppm, for 500 hours at a strain of 1%.
  • an Ni-base alloy member made of an alloy consisting essentially of, by weight, 14 to 25% of Cr, not greater than 30% of Fe, 0.2 to 2% of Al, 0.5 to 3% of Ti, 0.7 to 4.5% of Nb and the balance substantially Ni, wherein said alloy has a structure containing discontinuous granular precipitate of Cr carbide along the grain boundary or an apparent primary recrystallization structure which precipitates in Eta phase Widman Maschinenn form or in dendritic form.
  • the Ni-base alloy member of the invention is produced by a process having the steps of subjecting the alloy of above-mentioned composition to a solution heat treatment, effecting a cold plastic working on the alloy at a reduction of cross-sectional area of not smaller than 40% and effecting a direct aging treatment on the alloy at a temperature of between 650 and 750°C.
  • the cold plastic working ratio ranges between 60 and 70% in terms of reduction of cross-sectional area.
  • the Ni-base alloy member of the invention can be produced also through a process having the steps of subjecting the alloy of the above-mentioned composition to a solution heat treatment, effecting a cold plastic working on the alloy at a reduction of cross-sectional area of not smaller than 25% and subjecting the alloy to « a two-stepped aging treatment consisting of an aging at 800 to 950°C and another aging at 600 to 750°C.
  • the cold plastic working ratio preferably ranges between 40 and 70% in terms of reduction of cross-sectional area. This process affords an advantage in that the working ratio can be made smaller than that in the first- mentioned process.
  • the Cr content should be 14% at the smallest, but any Cr content exceeding 25% degrades the hot workability and, in addition, a noxious phase known as TCP phase is formed to deteriorate the cold workability, mechanical properties and corrosion resistance. From these points of view, the Cr content preferably ranges between 14 and 25%, more preferably 14 and 20% and most preferably 14 and 17%.
  • the Si content and Mn content are selected to range between 0.02 and 0.5% and 0.1 and 1%, respectively.
  • the balance of the composition consists substantially of Ni.
  • the Ni content is preferably not smaller than 65%, and more preferably not smaller than 70%.
  • the direct aging treatment is preferably conducted at a temperature ranging between 650 and 750°C.
  • the two-stepped aging treatment is conducted preferably by heating the material to and maintaining the same at 800 to 900°C for 1 to 30 hours, cooling the material and then heating to and maintaining at 600 to 750°C for 1 to 30 hours. It is also preferred that the solution heat treatment is conducted at a temperature ranging between 950 and 1150°C.
  • Ni-base alloy member of the invention is suitable for use particularly as springs and bolts which are subjected to pure water of high pressure and tmpera- ture in nuclear reactors.
  • Figs. lc and ld illustrates a grater spring 22 for securing graphite seal segments 21 to a piston tube 20.
  • the garter spring 22 is a coiled spring having a coil length of 166 mm and formed from a wire of 0.36 mm dia. This garter spring is produced by a process which has the steps of preparation of molten alloy material, solidification, solution heat treatment, drawing, coiling at a working ratio of 25% or higher and two-stepped aging treatment.
  • Inconel x750 (commercial name) consisting essentially of, by weight, 72.92% of Ni, 15.48% of Cr, 6.91% of Fe, 0.57% of Al, 2.60% of Ti, 0.95% of Nb+Ta, 0.04% of C, 0.20% of Si and 0.23% of Mn was used as the blank.
  • Table 1 shows the result of a crevice constant strain test conducted in pure water of high temperature and pressure under the following condition.
  • test temperature 288°C pressure: 86 K g/cm 2 dissolved oxygen content: 8 ppm crevice forming material: graphite fiber wool strain: about 1.0% test time: 500 hours
  • Figs. 2 (a) to (d) show the metallographies as obtained through a direct aging treatment when the cold working ratio is 10%, 20%, 30% and 60%, respectively, while Figs.
  • Fig. 4 shows microscopic photos of metallographies of inconel x750 alloy subjected to direct aging treatment and two-stepped aging treatment, after cold plastic working at working ratio of 0%, 30% and 60%, respectively.
  • the direct aging treatment continuous precipitate of Cr carbide is observed along the grain boundary when the cold plastic working ratio is 0% and 30%. It is, therefore, understood that the low crevice SCC resistance in the alloy cold-worked at such low working ratio is attributable to the continuous precipitate of Cr carbide in the grain boundary.
  • the cold working at a working ratio not smaller than 40% is effective in the production of springs and bolts having superior crevice SCC resistance suitable for use in nuclear reactors, when the aging is conducted through a direct aging treatment, whereas, when the aging is conducted through two-stepped aging treatment, the cold working at a working ratio not smaller than 25% is effective.
  • the crevice SCC resistance can easily be evaluated through the observation of the metallography, i.e. the state of precipitate of Cr carbide and the existence of the apparent primary recrystallization structure.

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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 Nonferrous Metals Or Alloys (AREA)
EP83301811A 1982-04-02 1983-03-30 Elément de construction en alliage à base de nickel et procédé pour sa fabrication Expired EP0091279B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5578082A JPS58174538A (ja) 1982-04-02 1982-04-02 原子炉用隙間構造部材に用いられる耐応力腐食割れ性に優れたＮｉ基合金製部材
JP55780/82 1982-04-02

Publications (2)

Publication Number Publication Date
EP0091279A1 true EP0091279A1 (fr) 1983-10-12
EP0091279B1 EP0091279B1 (fr) 1986-12-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP83301811A Expired EP0091279B1 (fr) 1982-04-02 1983-03-30 Elément de construction en alliage à base de nickel et procédé pour sa fabrication

Country Status (3)

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EP (1) EP0091279B1 (fr)
JP (1) JPS58174538A (fr)
DE (1) DE3368289D1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0178785A2 (fr) * 1984-09-20 1986-04-23 Nippon Yakin Kogyo Kabushiki Kaisha Alliage à base de nickel, à résistance élevée contre la corrosion intercristalline et la fissuration par corrosion sous tension et à haute usinabilité à chaud
EP0226458A2 (fr) * 1985-12-11 1987-06-24 Inco Alloys International, Inc. Procédé de fabrication d'un alliage résistant aux températures élevées et utilisable dans des récupérateurs de chaleur
EP0235075A2 (fr) * 1986-01-20 1987-09-02 Mitsubishi Jukogyo Kabushiki Kaisha Alliage à base de nickel et procédé pour sa fabrication
FR2596066A1 (fr) * 1986-03-18 1987-09-25 Electricite De France Alliage austenitique nickel-chrome-fer
EP0260510A2 (fr) * 1986-09-15 1988-03-23 General Electric Company Procédé thermomécanique de production d'un superalliage à base de nickel résistant à la formation de criques de fatigue et produit ainsi obtenu
GB2199592A (en) * 1987-01-08 1988-07-13 Inco Alloys Int Silicon wafer treatment trays
EP0338574A1 (fr) * 1988-04-22 1989-10-25 Inco Alloys International, Inc. Alliages à base de nickel résistant à la sulfidation et à l'oxydation
EP0384013A1 (fr) * 1989-02-21 1990-08-29 Inco Alloys International, Inc. Procédé pour le renforcement des alliages à base de nickel travaillés à froid
EP0402168A1 (fr) * 1989-06-09 1990-12-12 The Babcock & Wilcox Company Procédé pour augmenter la résistance à la fissuration par corrosion sous contraintes d'alliage 718
EP1340825A2 (fr) * 2002-02-27 2003-09-03 Daido Tokushuko Kabushiki Kaisha Alliage à base de nickel, ressort en cet alliage résistant à haute température et procédé de fabrication de ce ressort
US8197748B2 (en) * 2008-12-18 2012-06-12 Korea Atomic Energy Research Institute Corrosion resistant structural alloy for electrolytic reduction equipment for spent nuclear fuel

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60204849A (ja) * 1984-03-28 1985-10-16 Toshiba Corp 原子力発電プラント制御棒駆動機構用シ−ルリング
JPH0742560B2 (ja) * 1984-12-14 1995-05-10 株式会社東芝 高温バネの製造方法
JPH0647701B2 (ja) * 1984-12-14 1994-06-22 株式会社東芝 マグネトロンのフイラメントライテイング用電気接続端子クリツプ
JPH0684535B2 (ja) * 1984-12-27 1994-10-26 株式会社東芝 ニッケル基合金の製造方法
CN104988356B (zh) * 2015-05-27 2017-03-22 钢铁研究总院 一种高纯净度镍基合金大型锻件制备方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1135003A (en) * 1966-07-14 1968-11-27 Int Nickel Ltd Nickel-chromium-iron alloys
FR2089069A5 (fr) * 1970-05-18 1972-01-07 United Aircraft Corp
FR2277901A2 (fr) * 1974-07-12 1976-02-06 Creusot Loire Perfectionnements aux alliages a base de nickel-fer-chrome, a durcissement structural obtenu par un traitement thermique approprie
FR2434206A1 (fr) * 1978-06-22 1980-03-21 Westinghouse Electric Corp Procede de traitement thermique d'alliages fer-nickel-chrome

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5726153A (en) * 1980-07-23 1982-02-12 Toshiba Corp Heat treatment of nickel superalloy
JPS57123948A (en) * 1980-12-24 1982-08-02 Hitachi Ltd Austenite alloy with stress corrosion cracking resistance
CA1194346A (fr) * 1981-04-17 1985-10-01 Edward F. Clatworthy Alliage haute resistance a base de nickel anticorrosion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1135003A (en) * 1966-07-14 1968-11-27 Int Nickel Ltd Nickel-chromium-iron alloys
FR2089069A5 (fr) * 1970-05-18 1972-01-07 United Aircraft Corp
FR2277901A2 (fr) * 1974-07-12 1976-02-06 Creusot Loire Perfectionnements aux alliages a base de nickel-fer-chrome, a durcissement structural obtenu par un traitement thermique approprie
FR2434206A1 (fr) * 1978-06-22 1980-03-21 Westinghouse Electric Corp Procede de traitement thermique d'alliages fer-nickel-chrome

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0178785A3 (en) * 1984-09-20 1987-08-05 Nippon Yakin Kogyo Kabushiki Kaisha Nickel-based alloy with high intergranular corrosion resistance, high stress corrosion cracking resistance and good hot workability
EP0178785A2 (fr) * 1984-09-20 1986-04-23 Nippon Yakin Kogyo Kabushiki Kaisha Alliage à base de nickel, à résistance élevée contre la corrosion intercristalline et la fissuration par corrosion sous tension et à haute usinabilité à chaud
US4761190A (en) * 1985-12-11 1988-08-02 Inco Alloys International, Inc. Method of manufacture of a heat resistant alloy useful in heat recuperator applications and product
EP0226458A2 (fr) * 1985-12-11 1987-06-24 Inco Alloys International, Inc. Procédé de fabrication d'un alliage résistant aux températures élevées et utilisable dans des récupérateurs de chaleur
EP0226458A3 (en) * 1985-12-11 1988-01-13 Inco Alloys International, Inc. Method of manufacture of a heat resistant alloy useful in heat recuperator applications
EP0235075A2 (fr) * 1986-01-20 1987-09-02 Mitsubishi Jukogyo Kabushiki Kaisha Alliage à base de nickel et procédé pour sa fabrication
EP0235075A3 (en) * 1986-01-20 1988-09-21 Mitsubishi Jukogyo Kabushiki Kaisha Ni-based alloy and method for preparing same
EP0242251A1 (fr) * 1986-03-18 1987-10-21 Electricite De France Organe de structure en alliage austénitique nickel-chrome-fer
FR2596066A1 (fr) * 1986-03-18 1987-09-25 Electricite De France Alliage austenitique nickel-chrome-fer
EP0260510A2 (fr) * 1986-09-15 1988-03-23 General Electric Company Procédé thermomécanique de production d'un superalliage à base de nickel résistant à la formation de criques de fatigue et produit ainsi obtenu
EP0260510A3 (en) * 1986-09-15 1989-10-18 General Electric Company Thermomechanical method of forming fatigue crack resistant nickel base superalloys and product formed
GB2199592A (en) * 1987-01-08 1988-07-13 Inco Alloys Int Silicon wafer treatment trays
GB2199592B (en) * 1987-01-08 1990-09-26 Inco Alloys Int Silicon wafer treatment trays
EP0338574A1 (fr) * 1988-04-22 1989-10-25 Inco Alloys International, Inc. Alliages à base de nickel résistant à la sulfidation et à l'oxydation
EP0384013A1 (fr) * 1989-02-21 1990-08-29 Inco Alloys International, Inc. Procédé pour le renforcement des alliages à base de nickel travaillés à froid
EP0402168A1 (fr) * 1989-06-09 1990-12-12 The Babcock & Wilcox Company Procédé pour augmenter la résistance à la fissuration par corrosion sous contraintes d'alliage 718
EP1340825A2 (fr) * 2002-02-27 2003-09-03 Daido Tokushuko Kabushiki Kaisha Alliage à base de nickel, ressort en cet alliage résistant à haute température et procédé de fabrication de ce ressort
EP1340825A3 (fr) * 2002-02-27 2003-10-08 Daido Tokushuko Kabushiki Kaisha Alliage à base de nickel, ressort en cet alliage résistant à haute température et procédé de fabrication de ce ressort
US6918972B2 (en) 2002-02-27 2005-07-19 Daido Tokushuko Kabushiki Kaisha Ni-base alloy, heat-resistant spring made of the alloy, and process for producing the spring
US8197748B2 (en) * 2008-12-18 2012-06-12 Korea Atomic Energy Research Institute Corrosion resistant structural alloy for electrolytic reduction equipment for spent nuclear fuel

Also Published As

Publication number Publication date
EP0091279B1 (fr) 1986-12-10
JPS58174538A (ja) 1983-10-13
DE3368289D1 (en) 1987-01-22
JPS6211058B2 (fr) 1987-03-10

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