JP2009121616A - Bolt, method of manufacturing bolt and reactor inside structure of nuclear reactor - Google Patents

Bolt, method of manufacturing bolt and reactor inside structure of nuclear reactor Download PDF

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JP2009121616A
JP2009121616A JP2007297092A JP2007297092A JP2009121616A JP 2009121616 A JP2009121616 A JP 2009121616A JP 2007297092 A JP2007297092 A JP 2007297092A JP 2007297092 A JP2007297092 A JP 2007297092A JP 2009121616 A JP2009121616 A JP 2009121616A
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bolt
layer
friction
friction stir
manufacturing
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Yoshinori Katayama
義紀 片山
Motoji Tsubota
基司 坪田
Yoshiaki Saito
善章 斉藤
Masashi Takahashi
雅士 高橋
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Toshiba Corp
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Toshiba Corp
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    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a bolt having high strength and high corrosion resistance. <P>SOLUTION: This manufacturing method of the bolt 11 is characterized by forming a frictional padding layer 3 by cladding a highly hard-highly corrosion resistant material 2 on a surface 4 by frictional agitation, or forming a frictional agitation layer 23 by frictionally agitating an unconsumed highly hard material 22 on a surface of a stainless steel base material, and forming a thread on this frictional padding layer 3 or the frictional agitation layer 23. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、強度および耐食性が要求されるボルトおよびボルトの製造方法、原子炉炉内構造物に関する。   The present invention relates to a bolt that requires strength and corrosion resistance, a method for manufacturing the bolt, and a reactor internal structure.

一般に、原子炉内構造物に使用されるボルト材には、強度および耐食性が要求されることから、析出硬化型ニッケル基合金や冷間加工したオーステナイト系ステンレス鋼などが使用されている。しかし、加圧水型原子炉ではバッフルフォーマーボルトと呼ばれる冷間加工したオーステナイト系ステンレス鋼製のボルトが使用されているが、硬度および耐食性に課題があった。   Generally, since bolts used for reactor internal structures are required to have strength and corrosion resistance, precipitation hardened nickel base alloys, cold worked austenitic stainless steels, and the like are used. However, cold-worked austenitic stainless steel bolts called baffle former bolts are used in pressurized water reactors, but there are problems with hardness and corrosion resistance.

そこで、高硬度および高耐食性材料を得る技術として低入熱プロセスである摩擦攪拌技術を利用した表面改質技術が考えられる。近年、開発された摩擦攪拌接合技術は、アルミニウムを中心に実用化されているが、鉄を中心とした高強度部材においては実用化されておらず、中でも表面改質技術については研究段階である。
特開２００７−１３２８９８号公報 特開２００３−０７４５３４号公報 特開２００６−２５５７１１号公報 Therefore, as a technique for obtaining a material having high hardness and high corrosion resistance, a surface modification technique using a friction stir technique that is a low heat input process can be considered. In recent years, the friction stir welding technology that has been developed has been put to practical use mainly for aluminum, but has not been put to practical use for high-strength materials centered on iron, and the surface modification technology is in the research stage. .
JP 2007-132898 A Japanese Patent Laid-Open No. 2003-074534 JP 2006-255711 A

上述した従来の析出硬化型ニッケル基合金や冷間加工したオーステナイト系ステンレス鋼製ボルトにおいては、原子炉運転中の高温高圧水環境下において硬度および耐食性に劣るという課題があった。   The conventional precipitation hardening nickel-base alloy and cold-worked austenitic stainless steel bolts described above have problems that they are inferior in hardness and corrosion resistance in a high-temperature and high-pressure water environment during reactor operation.

本発明は上述した課題を解決するためになされたものであり、ボルト材料を低温プロセスである摩擦攪拌接合技術を用いて製造することにより、高強度および高耐食性を有するボルトを提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a bolt having high strength and high corrosion resistance by manufacturing a bolt material using a friction stir welding technique which is a low temperature process. And

上記課題を解決するために本発明のボルトの製造方法は、高硬度高耐食材料を摩擦攪拌によって基材に肉盛りして形成された摩擦肉盛層、またはステンレス鋼基材の上に非消耗の高硬度材を摩擦攪拌させ、ステンレス鋼基材に形成された摩擦攪拌層を切り出し、この切り出された摩擦肉盛層または摩擦攪拌層から形成することを特徴とする。   In order to solve the above-described problems, the bolt manufacturing method of the present invention is a non-consumable friction build-up layer formed by overlaying a high-hardness and high-corrosion resistant material on a base material by friction stirring, or a stainless steel base material. The high-hardness material is friction-stirred, and the friction stir layer formed on the stainless steel substrate is cut out. The friction stir layer or the friction stir layer is cut out.

また、本発明のボルトの製造方法は、表面に高硬度高耐食材料を摩擦攪拌により肉盛して摩擦肉盛層を形成し、またはステンレス鋼基材の表面に非消耗の高硬度材を摩擦攪拌して摩擦攪拌層を形成し、この摩擦肉盛層または摩擦攪拌層にねじ山を形成することを特徴とする。   In addition, the bolt manufacturing method of the present invention is configured such that a high hardness and high corrosion resistance material is deposited on the surface by friction stirring to form a friction buildup layer, or a non-consumable high hardness material is rubbed on the surface of the stainless steel substrate. A friction stir layer is formed by stirring, and a thread is formed on the friction build-up layer or the friction stir layer.

またさらに、本発明のボルトの製造方法は、表面に耐食性が良好な箔、粉末、液体のいずれかを塗布し、その表面に非消耗の高硬度材を摩擦攪拌して摩擦攪拌層を形成し、この摩擦攪拌層にねじ山を形成することを特徴とする。   Furthermore, in the bolt manufacturing method of the present invention, a foil, powder, or liquid having good corrosion resistance is applied to the surface, and a non-consumable high hardness material is frictionally stirred on the surface to form a friction stirring layer. In this friction stir layer, a screw thread is formed.

また、本発明は上記製造方法によって製造されたボルトおよびこのボルトが形成された原子炉炉内構造物を特徴とする。   Further, the present invention is characterized by a bolt manufactured by the above-described manufacturing method and a reactor internal structure in which the bolt is formed.

本発明によれば、高硬度高耐食材料を摩擦攪拌により形成された肉盛層をボルト材料とすることにより、高硬度かつ高耐食性を有するボルトおよび原子炉炉内構造物を得ることが出来る。   According to the present invention, a bolt and a reactor internal structure having high hardness and high corrosion resistance can be obtained by using a built-up layer formed by friction stir of a high hardness and high corrosion resistance material as a bolt material.

また、本発明によれば、非消耗型の高硬度材料を摩擦攪拌により形成された摩擦攪拌層をボルト材料またはボルトのねじ部とすることにより、高硬度かつ高耐食を有するボルトおよび原子炉炉内構造物を得ることが出来る。   Further, according to the present invention, a bolt and a nuclear reactor having high hardness and high corrosion resistance can be obtained by using a friction stir layer formed by friction stir of a non-consumable high hardness material as a bolt material or a screw portion of the bolt. An internal structure can be obtained.

以下、本発明に係る摩擦攪拌技術を用いたボルトの実施の形態について、図面を参照して説明する。   Embodiments of a bolt using the friction stir technique according to the present invention will be described below with reference to the drawings.

（実施例１）
まず、図１を参照して実施例１を説明する。本実施例１は、基材１、高硬度高耐食材料による回転治具２、摩擦攪拌により形成された肉盛層３から構成されている。 Example 1
First, Embodiment 1 will be described with reference to FIG. The present Example 1 is comprised from the base material 1, the rotating jig 2 by a high-hardness high corrosion-resistant material, and the build-up layer 3 formed by friction stirring.

このように構成された本実施の形態において、図１（a）に示すように基材１に対し回転治具２を摩擦攪拌により肉盛りする。   In the present embodiment configured as described above, as shown in FIG. 1A, the rotating jig 2 is built up on the base material 1 by friction stirring.

図２に高硬度ステンレス鋼であるＳＵＳ４４０Ｃを回転冶具２とし、基材１をＳＵＳ３１６Ｌで加圧荷重２２５００Ｎ、回転数４００ｒｐｍの施工条件で摩擦攪拌による肉盛を行った後の肉盛層の断面観察例を示す。肉盛層の結晶粒は１μｍ以下と微細になっており、一般的に微細材料は高硬度で、耐食性に優れていることがわかっている。   FIG. 2 shows cross-sectional observation of the built-up layer after SUS440C, which is a high-hardness stainless steel, is used as the rotating jig 2 and the base material 1 is built up by friction stirring with SUS316L under a pressing load of 22500 N and a rotational speed of 400 rpm. An example is shown. The crystal grains of the overlay layer are as fine as 1 μm or less, and it is generally known that fine materials have high hardness and excellent corrosion resistance.

従って、図１（ｂ）に示すように、肉盛層３からボルト材３aを採取することにより、高硬度かつ高耐食を有するボルト材料３aを得ることが出来る。そして採取されたボルト材３aからボルトを切り出し、高硬度かつ高耐食性を有するボルトを製作することができる。   Therefore, as shown in FIG. 1B, by extracting the bolt material 3a from the build-up layer 3, a bolt material 3a having high hardness and high corrosion resistance can be obtained. A bolt having a high hardness and high corrosion resistance can be manufactured by cutting out the bolt from the collected bolt material 3a.

また、図３に示すようにボルト１１のねじ部４となる丸棒状態の部材の表面に回転冶具２による摩擦攪拌による肉盛層３を形成させた場合においても、肉盛層３からねじを切り出してねじ部４を形成することにより、高硬度かつ高耐食性を有するボルトを得ることが出来る。   Also, as shown in FIG. 3, even when the build-up layer 3 is formed by frictional stirring by the rotary jig 2 on the surface of the round bar member that becomes the screw portion 4 of the bolt 11, By cutting out and forming the screw part 4, the bolt which has high hardness and high corrosion resistance can be obtained.

また、本実施例に示した耐食性材料による回転治具２に肉盛溶接材料として実績があるコルモノイなどのニッケル基合金を適用することで、高硬度かつ高耐食を有するボルト材料を得ることが出来る。   In addition, a bolt material having high hardness and high corrosion resistance can be obtained by applying a nickel-based alloy such as Colmonoy, which has a proven record as a build-up welding material, to the rotary jig 2 made of the corrosion-resistant material shown in the present embodiment. .

また、本実施例に示した耐食性材料による回転治具２に肉盛溶接材料として実績があるステライトなどのコバルト基合金を適用することで、高硬度かつ高耐食を有するボルト材料を得ることが出来る。   Moreover, the bolt material which has high hardness and high corrosion resistance can be obtained by applying cobalt base alloys, such as stellite, which has a track record as overlay welding material to the rotary jig 2 made of the corrosion resistant material shown in the present embodiment. .

本実施の形態によれば、高硬度高耐食材料を摩擦攪拌により形成された肉盛層をボルト材料とすることにより、高硬度かつ高耐食性を有するボルトを得ることが出来る。   According to the present embodiment, a bolt having high hardness and high corrosion resistance can be obtained by using a built-up layer formed by friction stir of a high hardness and high corrosion resistance material as a bolt material.

（実施例２）
次に、本発明に係る実施例２について図４を参照して説明する。本実施例２は、基材１、非消耗型の高硬度を有する回転治具２２、摩擦攪拌層２３から構成されている。 (Example 2)
Next, Embodiment 2 according to the present invention will be described with reference to FIG. The second embodiment is composed of a base material 1, a non-consumable rotating jig 22 having high hardness, and a friction stir layer 23.

このように構成された本実施の形態において、基材１に対し非消耗型の高硬度を有する回転治具２２を摩擦攪拌することにより基材１内に摩擦攪拌層２３が形成される。摩擦攪拌層２３は、結晶粒が微細化することから高硬度かつ高耐食性材料に変換される。従って、摩擦攪拌層２３から図１（ｂ）と同様にボルト材を採取することにより、高硬度かつ高耐食を有するボルト材を得ることが出来る。そして採取されたボルト材からボルトを切り出し、高硬度かつ高耐食性を有するボルトを製作することができる。   In the present embodiment configured as described above, the friction stir layer 23 is formed in the substrate 1 by friction-stirring the non-consumable rotating jig 22 having high hardness with respect to the substrate 1. The friction stir layer 23 is converted into a material having high hardness and high corrosion resistance because the crystal grains become finer. Therefore, a bolt material having high hardness and high corrosion resistance can be obtained by collecting the bolt material from the friction stir layer 23 in the same manner as in FIG. Then, a bolt having a high hardness and high corrosion resistance can be manufactured by cutting out the bolt from the collected bolt material.

また、図３と同様にボルト１１のねじ部となる丸棒状態の部材の表面に非消耗型の高硬度を有する回転治具２２を摩擦攪拌することによりボルト１１表面に摩擦攪拌層２３を形成する。従って、摩擦攪拌層２３からねじを切り出してねじ部を形成することにより、ボルト１１表面に高硬度かつ高耐食を有する摩擦攪拌層２３を有するボルトを得ることが出来る。   Further, as in FIG. 3, a friction stir layer 23 is formed on the surface of the bolt 11 by friction stir of a non-consumable high-hardness rotating jig 22 on the surface of the round bar member that becomes the threaded portion of the bolt 11. To do. Therefore, a bolt having the friction stir layer 23 having high hardness and high corrosion resistance on the surface of the bolt 11 can be obtained by cutting a screw from the friction stir layer 23 to form a threaded portion.

本実施の形態によれば、非消耗型の高硬度材料を摩擦攪拌により形成された摩擦攪拌層をボルト材料またはボルトのねじ部とすることにより、高硬度かつ高耐食を有するボルトを得ることが出来る。   According to the present embodiment, a bolt having high hardness and high corrosion resistance can be obtained by using a friction stir layer formed by friction stir of a non-consumable high hardness material as a bolt material or a screw portion of the bolt. I can do it.

（実施例３）
次に、本発明に係る実施例３について図５を用いて説明する。本実施例３は、基材１、耐食性材料３１、非消耗型の高硬度を有する回転治具２２、摩擦攪拌層２３から構成されている。 (Example 3)
Next, Embodiment 3 according to the present invention will be described with reference to FIG. The third embodiment includes a base material 1, a corrosion-resistant material 31, a non-consumable rotating jig 22 having high hardness, and a friction stir layer 23.

このように構成された本実施の形態において、基材１に対し耐食性が良好な薄板、箔、粉末、液体のいずれかから成る耐食性材料３１を塗布または接触させ、非消耗型の高硬度を有する回転治具２２を摩擦攪拌することにより基材１と耐食性材料３１を接合させる。形成された摩擦攪拌層２３は、耐食性材料３１と同一材料であるため、基材に比べ耐食性が良好である。   In the present embodiment configured as described above, the base material 1 is coated or brought into contact with a corrosion-resistant material 31 made of any one of a thin plate, foil, powder, and liquid having good corrosion resistance, and has a non-consumable high hardness. The base material 1 and the corrosion-resistant material 31 are joined by friction stirring the rotating jig 22. The formed friction stir layer 23 is the same material as the corrosion-resistant material 31, and therefore has better corrosion resistance than the base material.

本実施の形態によれば、基材に耐食性材料を接触させ、非消耗型の高硬度を有する回転治具を用いて摩擦攪拌することにより摩擦攪拌層を得ることが出来る。   According to the present embodiment, a friction stir layer can be obtained by bringing a corrosion-resistant material into contact with a base material and performing friction stir using a non-consumable high-hardness rotating jig.

従って、摩擦攪拌層２３から図１（ｂ）と同様にボルト材を採取することにより、高硬度かつ高耐食を有するボルト材を得ることが出来る。そして採取されたボルト材からボルトを切り出し、高硬度かつ高耐食性を有するボルトを製作することができる。   Therefore, a bolt material having high hardness and high corrosion resistance can be obtained by collecting the bolt material from the friction stir layer 23 in the same manner as in FIG. Then, a bolt having a high hardness and high corrosion resistance can be manufactured by cutting out the bolt from the collected bolt material.

また、図３と同様にボルト１１のねじ部となる丸棒状態の部材の表面に非消耗型の高硬度を有する回転治具２２を摩擦攪拌することによりボルト１１表面に摩擦攪拌層２３を形成する。従って、摩擦攪拌層２３からねじを切り出してねじ部を形成することにより、ボルト１１表面に高硬度かつ高耐食を有する摩擦攪拌層２３を有するボルトを得ることが出来る。   Further, as in FIG. 3, a friction stir layer 23 is formed on the surface of the bolt 11 by friction stir of a non-consumable high-hardness rotating jig 22 on the surface of the round bar member that becomes the threaded portion of the bolt 11. To do. Therefore, a bolt having the friction stir layer 23 having high hardness and high corrosion resistance on the surface of the bolt 11 can be obtained by cutting a screw from the friction stir layer 23 to form a threaded portion.

本実施の形態によれば、非消耗型の高硬度材料を摩擦攪拌により形成された摩擦攪拌層をボルト材料またはボルトのねじ部とすることにより、高硬度かつ高耐食性を有するボルトを得ることが出来る。   According to the present embodiment, a bolt having high hardness and high corrosion resistance can be obtained by using a friction stir layer formed by friction stirring of a non-consumable high hardness material as a bolt material or a screw portion of the bolt. I can do it.

また、上記実施例１から３のボルトを原子炉炉内構造物を構成する沸騰水型原子炉においてはシュラウドヘッドボルト、加圧水型原子炉ではバッフルフォーマーボルトに採用することによって当該部分の硬度かつ耐食性を向上させることができる。   Further, the bolts of Examples 1 to 3 are adopted as shroud head bolts in boiling water reactors constituting the reactor internal structure, and baffle former bolts in pressurized water reactors, thereby increasing the hardness of the parts. Corrosion resistance can be improved.

本発明のボルトの製造方法の第１の実施例を示し、（a）は摩擦攪拌により肉盛りする概念を説明する斜視図、（ｂ）は肉盛層からボルト材を採取する概念を説明する縦断面図。The 1st Example of the manufacturing method of the volt | bolt of this invention is shown, (a) is a perspective view explaining the concept which builds up by friction stirring, (b) demonstrates the concept which extract | collects bolt material from a build-up layer. FIG. 摩擦肉盛試験後の断面を示す顕微鏡写真。The microscope picture which shows the cross section after a friction buildup test. 本発明のボルトの製造方法の第１の実施例をボルトの表面に適用した状態を示す概略斜視図。The schematic perspective view which shows the state which applied the 1st Example of the manufacturing method of the volt | bolt of this invention to the surface of the volt | bolt. 本発明のボルトの製造方法の第２の実施例を示す斜視図。The perspective view which shows the 2nd Example of the manufacturing method of the volt | bolt of this invention. 本発明のボルトの製造方法の第３の実施例を示す斜視図。The perspective view which shows the 3rd Example of the manufacturing method of the volt | bolt of this invention.

符号の説明Explanation of symbols

１…基材
２…耐食材料で構成された回転冶具
３…肉盛層
１１…ボルト
２２…非消耗型回転冶具
２３…摩擦攪拌層
３１…耐食材料 DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Rotary jig 3 comprised with corrosion resistant material ... Overlay layer 11 ... Bolt 22 ... Non-consumable rotary jig 23 ... Friction stirring layer 31 ... Corrosion resistant material

Claims (8)

高硬度高耐食材料を摩擦攪拌によって基材に肉盛りして形成された摩擦肉盛層を切り出し、この切り出された摩擦肉盛層から形成することを特徴とするボルトの製造方法。   A bolt manufacturing method comprising cutting out a friction buildup layer formed by depositing a high hardness and corrosion resistant material on a base material by friction stirring, and forming the cut out friction buildup layer. 表面に高硬度高耐食材料を摩擦攪拌により肉盛して摩擦肉盛層を形成し、この摩擦肉盛層にねじ山を形成することを特徴とするボルトの製造方法。   A method for producing a bolt, comprising forming a friction build-up layer by depositing a high hardness and corrosion-resistant material on the surface by friction stirring, and forming a screw thread on the friction build-up layer. 請求項１および２記載の高硬度高耐食材料はステンレス鋼、ニッケル基合金、コバルト基合金から選択されて成ることを特徴とするボルトの製造方法。   3. The bolt manufacturing method according to claim 1, wherein the high hardness and high corrosion resistance material is selected from stainless steel, nickel base alloy, and cobalt base alloy. ステンレス鋼基材の上に非消耗の高硬度材を摩擦攪拌させ、ステンレス鋼基材に形成された摩擦攪拌層を切り出し、この切り出された摩擦肉盛層から形成することを特徴とするボルトの製造方法。   A friction stir of a non-consumable high hardness material on a stainless steel base material, a friction stir layer formed on the stainless steel base material is cut out, and the bolt is formed from the cut friction build-up layer. Production method. ステンレス鋼基材の表面に非消耗の高硬度材を摩擦攪拌して摩擦攪拌層を形成し、この摩擦攪拌層にねじ山を形成することを特徴とするボルトの製造方法。   A method for manufacturing a bolt, comprising: friction-stirring a non-consumable high-hardness material on a surface of a stainless steel base material to form a friction stir layer; and forming a thread on the friction stir layer. 表面に耐食性が良好な箔、粉末、液体のいずれかを塗布または接触させ、その表面に非消耗の高硬度材を摩擦攪拌して摩擦攪拌層を形成し、この摩擦攪拌層にねじ山を形成することを特徴とするボルトの製造方法。   Apply or contact foil, powder, or liquid with good corrosion resistance on the surface, frictionally stir non-consumable high hardness material on the surface to form a friction stir layer, and form a thread on this friction stir layer A method for manufacturing a bolt, comprising: 請求項１から請求項６のいずれか１項記載の製造方法によって構成されたボルト。   The bolt comprised by the manufacturing method of any one of Claims 1-6. 請求項７に記載のボルトを高強度高耐食性が要求されるボルト締結部に使用することを特徴とする原子炉炉内構造物。  A reactor internal structure, wherein the bolt according to claim 7 is used in a bolt fastening portion that requires high strength and high corrosion resistance.
JP2007297092A 2007-11-15 2007-11-15 Bolt, method of manufacturing bolt and reactor inside structure of nuclear reactor Pending JP2009121616A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019158661A1 (en) * 2018-02-14 2019-08-22 Ejot Gmbh & Co. Kg Connecting element
WO2019158659A1 (en) * 2018-02-14 2019-08-22 Ejot Gmbh & Co. Kg Thread-forming screw and production thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019158661A1 (en) * 2018-02-14 2019-08-22 Ejot Gmbh & Co. Kg Connecting element
WO2019158659A1 (en) * 2018-02-14 2019-08-22 Ejot Gmbh & Co. Kg Thread-forming screw and production thereof
WO2019158660A1 (en) * 2018-02-14 2019-08-22 Ejot Gmbh & Co. Kg Thread-forming screw and production thereof

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