JPH11230880A - Method for adding mark for verifying state of crack development - Google Patents
Method for adding mark for verifying state of crack developmentInfo
- Publication number
- JPH11230880A JPH11230880A JP2830298A JP2830298A JPH11230880A JP H11230880 A JPH11230880 A JP H11230880A JP 2830298 A JP2830298 A JP 2830298A JP 2830298 A JP2830298 A JP 2830298A JP H11230880 A JPH11230880 A JP H11230880A
- Authority
- JP
- Japan
- Prior art keywords
- crack
- mark
- clad
- load
- fatigue
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明はクラッド材に対する
割れ進展状況確認マーク付与方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of providing a crack progress confirmation mark on a clad material.
【0002】[0002]
【従来の技術】例えば低合金鋼のような同一材質の母材
部に機械的に疲労割れを導入する場合には、一般的には
母材表面にEDM(放電加工)ノッチのような疲労予亀
裂を形成し、三点曲げ試験機等により疲労予亀裂が進展
するよう母材に繰り返し負荷を与え、疲労予亀裂部に応
力集中を付与することにより割れを形成している。2. Description of the Related Art For example, when mechanically introducing fatigue cracks into a base material of the same material such as low alloy steel, generally, a fatigue prediction such as an EDM (Electric Discharge Machining) notch is formed on the surface of the base material. A crack is formed, a load is repeatedly applied to the base material by a three-point bending test machine or the like so that the pre-fatigue crack propagates, and a stress is applied to the pre-fatigue crack portion to form a crack.
【0003】而して、母材に付与された割れの進展状況
を確認するための代表的な方法としては、母材にビーチ
マークを付与する方法があり、母材に対するビーチマー
クの付与は次のような手順にて行う。[0003] As a typical method for confirming the progress of cracks imparted to the base material, there is a method of giving a beach mark to the base material. The procedure is as follows.
【0004】すなわち、図2に示すごとく、低合金鋼の
母材1の表面に疲労予亀裂2を与え、疲労予亀裂2が進
展して割れが入るよう母材1に単位時間当りに所定の繰
り返し負荷回数で所定の負荷(最大応力及び最小応力)
を与える。That is, as shown in FIG. 2, a pre-fatigue crack 2 is given to the surface of a base material 1 made of a low alloy steel, and a predetermined amount of heat is applied to the base material 1 per unit time so that the pre-fatigue crack 2 propagates and cracks. Prescribed load (maximum stress and minimum stress) by repeated load times
give.
【0005】次にビーチマークを付与する際には単位時
間当りの繰り返し負荷回数或いは負荷のうち少くとも何
れか一方或いは両者を最初とは異なる値に変更してすな
わち試験条件を変更して前述と同様、母材1の疲労予亀
裂2が進展する方向へ所定の負荷回数で所定の負荷を与
える。Next, when a beach mark is provided, at least one of the number of repetitive loads per unit time or at least one of the loads is changed to a value different from the initial value, that is, the test conditions are changed, and Similarly, a predetermined load is applied at a predetermined number of times in the direction in which the pre-fatigue crack 2 of the base material 1 propagates.
【0006】以下、同様にして繰り返し負荷を与える
と、母材1の試験条件を変更した部分に疲労予亀裂2の
近傍を中心として母材1の厚さ方向へ略同心状にビーチ
マークと言われるマーク3が付与される。Hereinafter, when a load is repeatedly applied in the same manner, a beach mark is substantially concentrically formed in the thickness direction of the base material 1 around the vicinity of the pre-fatigue crack 2 in a portion where the test condition of the base material 1 is changed. Mark 3 is given.
【0007】而して、マーク3の発生位置と繰り返し回
数及び負荷荷重は相関があるため、母材1を疲労予亀裂
2を付与した部分から破断してマーク3の発生状況を見
れば、母材1に対する割れの進展状況を確認することが
できる。Since there is a correlation between the position at which the mark 3 is generated, the number of repetitions, and the applied load, the base material 1 is broken from the portion where the pre-fatigue crack 2 is applied, and the generation state of the mark 3 The progress of cracking in the material 1 can be confirmed.
【0008】一方、図3に示すごとく、低合金鋼の母材
1にステンレス鋼クラッド材或いはニッケル系金属であ
るインコネルをバタリングしてクラッド部4を形成した
クラッド材5についても、クラッド部4の表面に疲労予
亀裂2を形成し、疲労予亀裂2から割れが進展するよ
う、クラッド材5にある荷重条件で繰り返し負荷を与
え、又試験条件を変更して繰り返し負荷を与え、最終的
にはクラッド材5を破断観察した。On the other hand, as shown in FIG. 3, a clad material 5 in which a clad portion 4 is formed by buttering a stainless steel clad material or inconel, which is a nickel-based metal, on a base material 1 of low alloy steel is also used. A pre-fatigue crack 2 is formed on the surface, a repetitive load is applied to the clad material 5 under a certain load condition so that the crack propagates from the pre-fatigue crack 2, and a test condition is changed to repeatedly apply a load. The clad material 5 was observed for breakage.
【0009】[0009]
【発明が解決しようとする課題】しかしながら、図3に
示すクラッド材5の場合、マーク3は母材1の部分には
付与されるが、クラッド部4の部分には付与されず、従
ってクラッド部4の部分については割れの進展状況を確
認することができないという問題がある。However, in the case of the clad material 5 shown in FIG. 3, the mark 3 is provided on the base material 1 but not on the clad portion 4, and therefore the mark 3 is not provided. There is a problem that the progress of cracking cannot be confirmed for the portion No. 4.
【0010】本発明は上述の実情に鑑み、クラッド部の
様なビーチマークの入らない部分にも割れの進展を確認
するためのマークを付与し得るようにすることを目的と
してなしたものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a mark for confirming the progress of cracking even in a portion where a beach mark does not enter, such as a clad portion. .
【0011】[0011]
【課題を解決するための手段】本発明の割れ進展状況確
認マーク付与方法は、母材にバタリングしたビーチマー
クの入らない材料の表面に疲労予亀裂を形成したクラッ
ド材を、疲労予亀裂が進展して割れが形成されるよう繰
り返し負荷を与える工程と、所要回数の繰り返し負荷を
与えられたクラッド材を加熱する熱処理工程により処理
するものである。According to the present invention, there is provided a method for providing a crack progress confirmation mark according to the present invention, comprising the steps of: And a heat treatment step of heating the clad material to which a required number of repetitive loads have been applied.
【0012】従って、本発明によれば、ビーチマークの
付与することのできない材料に対しても割れの進展状況
を確認するためのマークを付与することができる。Therefore, according to the present invention, a mark for checking the progress of cracking can be provided even for a material to which a beach mark cannot be provided.
【0013】[0013]
【発明の実施の形態】以下、本発明の実施の形態を添付
図面を参照しつつ説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【0014】図1は本発明の実施の形態の一例を示す断
面図であり、図中、図3に示すものと同一のものには同
一の符号が付してある。FIG. 1 is a sectional view showing an example of an embodiment of the present invention, in which the same components as those shown in FIG. 3 are denoted by the same reference numerals.
【0015】本発明の形態例においては、三点曲げ試験
機等に単位時間当りの繰り返し負荷回数及び繰り返し負
荷を付与する時間等の運転条件を設定し、クラッド部4
の表面に疲労予亀裂2の形成してあるクラッド材5に、
疲労予亀裂2が促進して割れ6が形成されるよう繰り返
し負荷を与える。In the embodiment of the present invention, the operating conditions such as the number of repetitive loads per unit time and the time for applying the repetitive load to the three-point bending tester or the like are set, and the cladding part 4 is set.
In the clad material 5 having the fatigue pre-crack 2 formed on the surface of
The repetitive load is applied so that the fatigue pre-crack 2 is promoted and the crack 6 is formed.
【0016】而して、所定時間繰り返し負荷を与えた
ら、繰り返し負荷を与える作業を中断し、クラッド材5
を例えば温度500℃で2時間に亘り加熱して熱処理を
行い、熱処理後再び三点曲げ試験機等により所定の運転
条件でクラッド材5に疲労予亀裂2が促進して割れ6が
更に形成されるよう繰り返し負荷を与える。When the load is repeatedly applied for a predetermined time, the operation of applying the load is interrupted and the clad material 5 is removed.
Is heated at a temperature of, for example, 500 ° C. for 2 hours to perform a heat treatment. After the heat treatment, the pre-fatigue crack 2 is promoted in the clad material 5 under predetermined operating conditions by a three-point bending tester or the like, and a crack 6 is further formed. Apply a load repeatedly.
【0017】所定回数の繰り返し負荷を与えたら、繰り
返し負荷を与える作業を中断し、クラッド材5を例えば
温度300℃で2時間に亘り加熱して熱処理を行い、熱
処理後、再び上述と同様にしてクラッド材5に繰り返し
負荷を与える。When a predetermined number of repetitive loads are applied, the operation of applying the repetitive load is interrupted, and the clad material 5 is heated at a temperature of, for example, 300 ° C. for 2 hours to perform a heat treatment. A load is repeatedly applied to the clad material 5.
【0018】斯かる繰り返し負荷を与える工程と熱処理
工程とを所要回数行った後、クラッド部4を疲労予亀裂
2の部分から破断して調べたところ、クラッド部4には
図1に示すごとく割れ6と対応してヒートペイントマー
クと言われるマーク7が付与された。このマーク7は割
れ6の入った部分と入っていない部分の金属の焼け具合
の相違により表われる。After performing the repetitive load applying step and the heat treatment step a required number of times, the clad part 4 was fractured from the portion of the pre-fatigue crack 2, and the clad part 4 was cracked as shown in FIG. In correspondence with No. 6, a mark 7 called a heat paint mark was provided. This mark 7 appears due to the difference in the degree of burning of the metal between the part where the crack 6 is included and the part where the crack 6 is not included.
【0019】従って、クラッド部4の部分は、熱処理に
より付与されたマーク7を観察することにより割れ6の
進展状況を確認することができた。Therefore, in the clad portion 4, the progress of the crack 6 could be confirmed by observing the mark 7 provided by the heat treatment.
【0020】なお、本発明は上述の実施の形態例に限定
されるものではなく、本発明の要旨を逸脱しない範囲内
で種々変更を加え得ることは勿論である。It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the spirit of the present invention.
【0021】[0021]
【発明の効果】本発明の割れ進展状況確認マーク付与方
法によれば、いわゆるビーチマークを付与できない材料
にも割れの進展状況を確認するためのマークを付与する
ことができるという優れた効果を奏し得る。According to the method for imparting a crack progress confirmation mark of the present invention, there is an excellent effect that a mark for confirming the progress of cracking can be given to a material to which a so-called beach mark cannot be given. obtain.
【図面の簡単な説明】[Brief description of the drawings]
【図1】本発明の割れ進展状況確認マーク付与方法を説
明するための断面図である。FIG. 1 is a cross-sectional view for explaining a method for imparting a crack progress confirmation mark according to the present invention.
【図2】従来の割れ進展状況確認マーク付与方法を説明
するための断面図である。FIG. 2 is a cross-sectional view for explaining a conventional method for assigning a crack progress confirmation mark.
【図3】クラッド部にはビーチマークが入らないことを
説明するための断面図である。FIG. 3 is a cross-sectional view for explaining that a beach mark does not enter a clad portion.
1 母材 2 疲労予亀裂 4 クラッド部(ビーチマークの入らない材料) 5 クラッド材 6 割れ DESCRIPTION OF SYMBOLS 1 Base material 2 Pre-fatigue crack 4 Cladding part (material without beach mark) 5 Cladding material 6 Crack
───────────────────────────────────────────────────── フロントページの続き (72)発明者 佐藤 安穂 神奈川県横浜市磯子区新中原町1番地 石 川島播磨重工業株式会社技術研究所内 (72)発明者 坂本 博 神奈川県横浜市磯子区新中原町1番地 石 川島播磨重工業株式会社技術研究所内 (72)発明者 中川 明 神奈川県横浜市磯子区新中原町1番地 石 川島播磨重工業株式会社技術研究所内 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yasuho Sato 1 Shinnakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Ishikawajima-Harima Heavy Industries Co., Ltd. (72) Inventor Hiroshi Sakamoto Shinnaka, Isogo-ku, Yokohama-shi, Kanagawa No. 1 Haramachi Ishi Kawashima-Harima Heavy Industries Co., Ltd.
Claims (1)
らない材料の表面に疲労予亀裂を形成したクラッド材
を、疲労予亀裂が進展して割れが形成されるよう繰り返
し負荷を与える工程と、所要回数の繰り返し負荷を与え
られたクラッド材を加熱する熱処理工程により処理する
ことを特徴とする割れ進展状況確認マーク付与方法。A step of repeatedly applying a load to a clad material having a pre-fatigue crack formed on a surface of a material which does not include a beach mark buttered on a base material so that the pre-fatigue crack propagates and a crack is formed; A method for providing a crack progress confirmation mark, wherein the method is performed by a heat treatment step of heating a clad material to which a repetitive load is applied.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2830298A JPH11230880A (en) | 1998-02-10 | 1998-02-10 | Method for adding mark for verifying state of crack development |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2830298A JPH11230880A (en) | 1998-02-10 | 1998-02-10 | Method for adding mark for verifying state of crack development |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH11230880A true JPH11230880A (en) | 1999-08-27 |
Family
ID=12244836
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2830298A Pending JPH11230880A (en) | 1998-02-10 | 1998-02-10 | Method for adding mark for verifying state of crack development |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH11230880A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000214143A (en) * | 1999-01-22 | 2000-08-04 | Ishikawajima Harima Heavy Ind Co Ltd | Production of sham test piece for non-destructive inspection and non-destructive inspection method |
WO2009093488A1 (en) | 2008-01-22 | 2009-07-30 | National Institute Of Advanced Industrial Science And Technology | Fatigue testing method in hydrogen gas |
-
1998
- 1998-02-10 JP JP2830298A patent/JPH11230880A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000214143A (en) * | 1999-01-22 | 2000-08-04 | Ishikawajima Harima Heavy Ind Co Ltd | Production of sham test piece for non-destructive inspection and non-destructive inspection method |
WO2009093488A1 (en) | 2008-01-22 | 2009-07-30 | National Institute Of Advanced Industrial Science And Technology | Fatigue testing method in hydrogen gas |
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