JP4823986B2 - Deformation Charpy impact test piece for evaluating brittle fracture propagation stop property of thick steel plate and quality control method of brittle fracture propagation stop property of thick steel plate - Google Patents

Deformation Charpy impact test piece for evaluating brittle fracture propagation stop property of thick steel plate and quality control method of brittle fracture propagation stop property of thick steel plate Download PDF

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JP4823986B2
JP4823986B2 JP2007211637A JP2007211637A JP4823986B2 JP 4823986 B2 JP4823986 B2 JP 4823986B2 JP 2007211637 A JP2007211637 A JP 2007211637A JP 2007211637 A JP2007211637 A JP 2007211637A JP 4823986 B2 JP4823986 B2 JP 4823986B2
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charpy impact
brittle fracture
fracture propagation
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propagation stop
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JP2009047462A (en
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健裕 井上
陽一 萱森
浩幸 白幡
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Nippon Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a deformation Charpy impact test piece and a quality control method of a brittle fracture propagation stopping characteristic of a thick steel plate, capable of evaluating easily the brittle fracture propagation stopping characteristic of the thick steel plate. <P>SOLUTION: When evaluating a brittle fracture propagation stopping performance Kca value of the thick steel plate, a Charpy impact test is performed by using a deformation Charpy impact test piece having the thickness of 10 mm, the width of 15 mm-25 mm and the length of 55 mm, preferably, a chevron notch deformation Charpy impact test piece. When a 70 J energy transition temperature vT<SB>CN70J</SB>(&deg;C) is lower than vT<SB>CN70J</SB>(&deg;C) calculated by the formula (1), it is determined that the brittle fracture propagation stopping performance Kca value determined by a brittle fracture propagation stopping test is not less than 3,900 (N/mm<SP>1.5</SP>) at T<SB>0</SB>&deg;C. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

本発明は、船舶、低温タンク、発電用水圧鉄管などの大型構造物に用いられる、脆性破壊伝播停止特性に優れた厚鋼板の品質管理方法に好適な、厚鋼板の脆性破壊伝播停止特性評価用の変形シャルピー衝撃試験片(以下、単に「変形シャルピー衝撃試験片」とも言う)および厚鋼板の脆性破壊伝播停止特性の品質管理方法に関するものである。 The present invention is used for evaluating a brittle fracture propagation stop property of a thick steel plate , which is suitable for a quality control method of a thick steel plate having excellent brittle fracture propagation stop properties, which is used for a large structure such as a ship, a low temperature tank, a hydraulic iron pipe for power generation . The modified Charpy impact test piece (hereinafter, also simply referred to as “deformed Charpy impact test piece”) and the quality control method for brittle fracture propagation stop characteristics of thick steel plates.

脆性破壊は鉄鋼材料等の構造材料において、時として大規模な塑性変形を伴わず、材料の降伏強度以下の低応力で発生し、1000m/s程度の高速で長距離伝播して構造物が一瞬の内に破壊するため、安全上きわめて重要な現象である。   Brittle fracture occurs in structural materials, such as steel materials, sometimes with a low stress below the yield strength of the material without large-scale plastic deformation, and propagates over a long distance at a high speed of about 1000 m / s, causing the structure to momentarily It is a very important phenomenon for safety because it breaks down inside.

この脆性破壊の発生を防止するための手法としては、非特許文献1に規定されるCTOD(Crack-Tip
Opening Displacement)試験等の評価試験を用いた非特許文献2等の防止法が提案され、各種規格に取り入れられ、脆性破壊の発生防止が可能になってきている。
As a technique for preventing the occurrence of brittle fracture, CTOD (Crack-Tip defined in Non-Patent Document 1 is used.
Prevention methods such as Non-Patent Document 2 using an evaluation test such as an Opening Displacement test have been proposed and incorporated in various standards, and it has become possible to prevent the occurrence of brittle fracture.

一方、脆性破壊は、一瞬の内に高速伝播するため、特に大規模構造物では、万が一脆性破壊が発生した場合でも、き裂の伝播防止することが出来れば、安全性を格段に上げることが可能になる。実際に、LNG(Liquified Natural
Gas)やLPG(Liquified Petrolium Gas)等の低温タンクに用いられる低温用鋼や、水圧鉄管用鋼材、造船用鋼材等では、非特許文献3に規定される脆性破壊伝播停止試験のような大型破壊試験で測定される脆性破壊伝播停止特性Kca値、に対する要求値が規定されている。
On the other hand, since brittle fracture propagates at a high speed in an instant, even in the case of large-scale structures, even if brittle fracture occurs, safety can be significantly improved if crack propagation can be prevented. It becomes possible. Actually, LNG (Liquified Natural
Gas, LPG (Liquified Petrolium Gas) and other low-temperature steel, hydraulic iron pipe steel, shipbuilding steel, etc., large-scale fracture such as the brittle fracture propagation stop test specified in Non-Patent Document 3 A required value for the brittle fracture propagation stop characteristic Kca value measured in the test is specified.

これらの試験は、試験実施のための工期、コストが大きく、一般に品質管理のための試験としては適当ではない。そこで、代表的な簡易評価試験であるシャルピー衝撃試験法と脆性破壊伝播停止特性を用いた相関式が非特許文献4〜6にあるように提案され、シャルピー衝撃試験を規定して脆性き裂伝播停止特性を期待することが従来行われてきた。   These tests have a large construction period and cost for performing the tests, and are generally not suitable as tests for quality control. Therefore, a correlation formula using the Charpy impact test method, which is a typical simple evaluation test, and the brittle fracture propagation stop characteristics is proposed as described in Non-Patent Documents 4 to 6, and the Charpy impact test is defined to determine the brittle crack propagation. It has been done in the past to expect stop characteristics.

さらに、脆性き裂伝播停止特性は板厚依存性があるため、非特許文献4または5では板厚依存性についても考慮されている。   Furthermore, since the brittle crack propagation stop characteristic has a plate thickness dependency, Non-Patent Documents 4 and 5 also consider the plate thickness dependency.

また、非特許文献4にあるプレスノッチシャルピー衝撃試験法、ASTM(American
Standard of Testing and Materials)規格E−208に規定されている落重試験法や、非特許文献3にあるような切欠き付き曲げ試験法(TKB試験法)等による評価も検討されてきた。
日本溶接協会WES1108規格 日本溶接協会WES2805規格 日本溶接協会規格「WES鋼種認定試験方法」(1995) 日本溶接協会WES3003規格「低温用圧延鋼板判定基準」(1995) 日本鉄鋼協会「データシートシリーズ4」(1982) 井上他「TKB試験による脆性き裂の伝播停止阻止性能評価」溶接学会全国大会講演概要 第42集 p.238(1988)
Also, press notch Charpy impact test method described in Non-Patent Document 4, ASTM (American
Evaluation by a drop weight test method defined in Standard of Testing and Materials (E-208), a notched bending test method (TKB test method) as described in Non-Patent Document 3, and the like has also been studied.
Japan Welding Association WES1108 Standard Japan Welding Association WES2805 standard Japan Welding Association Standard "WES Steel Grade Certification Test Method" (1995) Japan Welding Association WES3003 Standard "Low Temperature Rolled Steel Sheet Criteria" (1995) Japan Steel Association "Data Sheet Series 4" (1982) Inoue et al. “Evaluation of Propagation of Brittle Crack Propagation Stopping Performance by TKB Test” National Welding Society Annual Meeting, Vol. 42, p.238 (1988)

しかしながら、シャルピー衝撃試験は脆性破壊の発生特性の影響を強く受けるため、脆性破壊の伝播停止特性との相関は大きなバラツキを含んでおり、精度上大きな問題があった。また、プレスノッチシャルピー衝撃試験法のように、脆性破壊の発生を容易にし、脆性破壊の伝播停止特性を評価しようとした手法も提案されたが、発生特性の影響が大きく残り、十分な精度は得られなかった。   However, since the Charpy impact test is strongly influenced by the characteristics of the occurrence of brittle fracture, the correlation with the propagation stop characteristics of the brittle fracture includes a large variation, and there is a big problem in accuracy. Also, a method has been proposed to facilitate the occurrence of brittle fracture and evaluate the propagation stop characteristics of brittle fracture, such as the press notch Charpy impact test method, but the influence of the occurrence characteristics remains significant, and sufficient accuracy is not achieved. It was not obtained.

一方、落重試験法、TKB試験法等の試験法は、簡易評価法に分類されるもの、試験片形状や試験片加工コストが大きく、一方で精度上の問題もあり、出荷試験として実施するには不十分であった。   On the other hand, test methods such as drop weight test method and TKB test method are classified as simple evaluation methods, and the test piece shape and test piece processing cost are large, but on the other hand, there are problems in accuracy, and it is carried out as a shipping test. It was not enough.

そこで、本発明は、上記課題を有利に解決して、厚鋼板の脆性破壊伝播停止特性を簡易に評価することのできる、変形シャルピー衝撃試験片および厚鋼板の脆性破壊伝播停止特性の品質管理方法を提供することを目的とするものである。   Therefore, the present invention advantageously solves the above-mentioned problems and can easily evaluate the brittle fracture propagation stop characteristic of the thick steel sheet, and a quality control method for the brittle fracture propagation stop characteristic of the deformed Charpy impact test piece and the thick steel sheet. Is intended to provide.

本発明者らは、出荷試験等に使用可能な簡易評価法の条件として、広く普及した既存の試験機で評価可能であること、試験片の製作コストがシャルピー衝撃試験片の数倍程度以内であることを前提にして検討した。   As a condition of a simple evaluation method that can be used for shipping tests, etc., the present inventors can evaluate with existing widely used testing machines, and the production cost of the test piece is within several times that of Charpy impact test piece. We examined on the assumption that there is.

脆性破壊伝播停止特性を精度良く評価するためには、脆性き裂の発生を容易にする必要がある。そこで、脆性き裂の発生を容易にするために、シャルピー衝撃試験片の切欠き比を大きくした変形シャルピー衝撃試験片を着想した。しかし、シャルピー衝撃試験片に単純に上記の改良を加えると、切欠き位置での断面積が小さくなり、脆性破壊伝播停止特性の評価に適さないため、標準シャルピー衝撃試験片の切欠き位置の断面積と一致させる形状で、かつ既存のシャルピー衝撃試験機で試験可能な形状とすることが好ましいことを見出した。
本発明は、以上のような検討の結果初めて成されたものであり、その要旨は以下のとおりである。
(1) JIS Z 2242に規定されるシャルピー衝撃試験に用いられる試験片であって、シャルピー衝撃試験機に取付けられた状態において、前面の長さ方向の中央に所定形状の切欠き部を有し、長さが55±0.6mmで、高さが10±0.05mmであり、少なくとも切欠き部の両側部分は、幅が15〜25mmであり、長さ方向の両端から8〜20mmまでの部分は、幅が10±0.05mmであることを特徴とする、厚鋼板の脆性破壊伝播停止特性評価用の変形シャルピー衝撃試験片。
(2) 前記切欠き部が、高さ方向の中央で浅く上下端で深い山形形状のシェブロンノッチであることを特徴とする、上記(1)に記載の厚鋼板の脆性破壊伝播停止特性評価用の変形シャルピー衝撃試験片。
(3) 前記切欠き部の位置での残存断面積が80mmであることを特徴とする、請求項(1)または(2)に記載の厚鋼板の脆性破壊伝播停止特性評価用の変形シャルピー衝撃試験片。
(4) 上記(1)〜(3)のいずれか1項に記載の変形シャルピー衝撃試験片を用い、JIS Z 2242に規定されるシャルピー衝撃試験に準拠して、厚鋼板の脆性破壊伝播停止特性(アレスト特性)を評価することを特徴とする、厚鋼板の脆性破壊伝播停止特性の品質管理方法。
(5) 上記(2)に記載のシェブロンノッチを有する変形シャルピー衝撃試験片の70Jエネルギー遷移温度vTCN70J(℃)が、次式(1)で計算されるvTCN70J(℃)以下である場合に、日本溶接協会規格「WES鋼種認定試験方法」(1995)に規定される脆性破壊伝播停止試験で求められる脆性破壊伝播停止性能Kca値がT℃で3900(N/mm1.5)以上であると判定することを特徴とする、(4)に記載の厚鋼板の脆性破壊伝播停止特性の品質管理方法。

Figure 0004823986
In order to accurately evaluate the brittle fracture propagation stop characteristics, it is necessary to facilitate the occurrence of brittle cracks. Therefore, in order to facilitate the generation of brittle cracks, a modified Charpy impact test piece with an increased notch ratio of the Charpy impact test piece was conceived. However, simply adding the above improvements to a Charpy impact test piece reduces the cross-sectional area at the notch position and is not suitable for evaluating brittle fracture propagation stop characteristics. It has been found that it is preferable to have a shape that matches the area and that can be tested with an existing Charpy impact tester.
The present invention has been made for the first time as a result of the above studies, and the gist thereof is as follows.
(1) A test piece used in the Charpy impact test specified in JIS Z 2242, and has a notch with a predetermined shape at the center in the length direction of the front surface when attached to the Charpy impact tester. in the 55 ± 0.6 mm in length, a is 10 ± 0.05 mm height, both side portions of at least notches have a width Ri 15~25mm der until 8~20mm from both ends in the longitudinal direction part, width and wherein 10 ± 0.05 mm der Rukoto, thickness variations Charpy impact test specimens brittle fracture propagation stop characteristics for evaluation of the steel sheet.
(2) For evaluating the brittle fracture propagation stop characteristics of a thick steel plate according to (1) , wherein the notch is a chevron notch having a shallow chevron shape at the center in the height direction and shallow at the upper and lower ends . modified Charpy impact test specimens.
(3) The modified Charpy for evaluation of brittle fracture propagation stop characteristics of a thick steel plate according to claim (1) or (2) , wherein the remaining cross-sectional area at the position of the notch is 80 mm 2. Impact test piece.
(4) Using the deformed Charpy impact test piece described in any one of (1) to (3 ) above, in accordance with the Charpy impact test specified in JIS Z 2242, the brittle fracture propagation stop property of the thick steel plate A quality control method for brittle fracture propagation stop characteristics of a thick steel plate, characterized by evaluating (arrest characteristics).
(5) When the 70J energy transition temperature vT CN70J (° C) of the deformed Charpy impact test piece having the chevron notch described in (2) is equal to or lower than vT CN70J (° C) calculated by the following equation (1) The brittle fracture propagation stop performance Kca value determined by the brittle fracture propagation stop test specified in the Japan Welding Association Standard “WES Steel Grade Certification Test Method” (1995) is 3900 (N / mm 1.5 ) or more at T 0 ° C. The quality control method for brittle fracture propagation stop characteristics of a thick steel plate according to (4) , characterized in that it is present.
Figure 0004823986

本発明によれば、脆性破壊伝播停止特性Kca値を保証する際、非特許文献3に規定される脆性破壊伝播停止試験のような大型試験によることなく、簡易で精度良い判定が可能となる。   According to the present invention, when the brittle fracture propagation stop characteristic Kca value is guaranteed, a simple and accurate determination can be performed without using a large-scale test such as the brittle fracture propagation stop test defined in Non-Patent Document 3.

以下、本発明を実施するための最良の形態について、図面を参照に説明する。図1は、本発明の第1の実施の形態にかかる変形シャルピー衝撃試験片1の平面図(a)と切欠き部10の位置での断面図(b)である。図2は、本発明の第2の実施の形態にかかる変形シャルピー衝撃試験片2の平面図(a)と切欠き部20の位置での断面図(b)である。これら変形シャルピー衝撃試験片1、2は、切欠き部10、20を前方に向けた状態でシャルピー衝撃試験機に取付けられる。そして、切欠き部10、20が形成された前面11、21と反対の側面(背面12、22)をハンマーで打撃して破断させることにより、JIS Z 2242に規定されるシャルピー衝撃試験が行われる。なお、本発明では、説明のため、前面11、21と背面12、22の厚さ方向を幅方向(図1、2における上下方向)、前面11、21および背面12、22に平行な方向を長さ方向(図1、2における左右方向)、これら幅方向および長さ方向に垂直な方向を高さ方向(図1、2における紙面垂直方向)と定義する。 The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a plan view (a) of a modified Charpy impact test piece 1 according to the first embodiment of the present invention and a cross-sectional view (b) at the position of a notch 10. FIG. 2A is a plan view of a modified Charpy impact test piece 2 according to the second embodiment of the present invention, and FIG. 2B is a cross-sectional view at the position of the notch 20. These deformed Charpy impact test pieces 1 and 2 are attached to the Charpy impact tester with the notches 10 and 20 facing forward. And the Charpy impact test prescribed | regulated to JISZ2242 is performed by hitting with the hammer and breaking the side surface (back surface 12,22) opposite to the front surface 11,21 in which the notch parts 10 and 20 were formed. . In the present invention, for the sake of explanation, the thickness direction of the front surfaces 11 and 21 and the rear surfaces 12 and 22 is the width direction (the vertical direction in FIGS. 1 and 2), and the direction parallel to the front surfaces 11 and 21 and the rear surfaces 12 and 22 is. The length direction (the left-right direction in FIGS. 1 and 2) and the direction perpendicular to the width direction and the length direction are defined as the height direction (the direction perpendicular to the paper surface in FIGS. 1 and 2).

このようなJIS Z 2242に規定されるシャルピー衝撃試験に用いられる通常のシャルピー衝撃試験片は、JIS Z 2202に規定されるように、長さ55mm±0.6mmで1辺が10mm±0.05mmの長さ方向全体に亘って一様な正方形断面を有する角柱形状であり、前面には、長さ方向の中央にVノッチ形状またはUノッチ形状の切欠き部が形成されている。これに対して、本発明にかかる変形シャルピー衝撃試験片1、2は、切欠き部10、20の両側部分の幅が15〜25mmとなっている点が特徴である。即ち、切欠き部10、20の両側部分の幅を10+Xmmとすれば、切欠き部10、20の両側では、所定の長さの部分においてX=5〜15mmの範囲で一定になっている。また、長さ方向の両端から8〜20mmまでの部分(Y)は、幅が10±0.05mmで一定になっている。このため、本発明にかかる変形シャルピー衝撃試験片1、2は、JIS Z 2242に規定されるシャルピー衝撃試験に取付けて、通常のシャルピー衝撃試験片と同様にシャルピー衝撃試験を実施することができる。   A normal Charpy impact test piece used for the Charpy impact test specified in JIS Z 2242 is 55 mm ± 0.6 mm in length and 10 mm ± 0.05 mm on one side as specified in JIS Z 2202. The front surface is formed with a V-notch-shaped or U-notched notch at the center in the length direction. On the other hand, the modified Charpy impact test pieces 1 and 2 according to the present invention are characterized in that the widths of both side portions of the notches 10 and 20 are 15 to 25 mm. That is, if the widths of both side portions of the notches 10 and 20 are 10 + X mm, both sides of the notches 10 and 20 are constant in a range of X = 5 to 15 mm in a predetermined length portion. Further, a portion (Y) from 8 to 20 mm from both ends in the length direction has a constant width of 10 ± 0.05 mm. Therefore, the deformed Charpy impact test pieces 1 and 2 according to the present invention can be attached to the Charpy impact test defined in JIS Z 2242 and the Charpy impact test can be performed in the same manner as a normal Charpy impact test piece.

長さ方向の両端から8〜20mmまでの部分(Y)と、前面11、21は、切欠き部10、20の両側部分(幅が15〜25mmとなっている部分)の間が斜面13、23になっている。この斜面13、23の長さ方向に対する角度Aは、20°以上である。   The portion (Y) from both ends in the length direction to 8 to 20 mm and the front surfaces 11 and 21 are inclined surfaces 13 between both side portions (portions having a width of 15 to 25 mm) of the notches 10 and 20. 23. An angle A with respect to the length direction of the slopes 13 and 23 is 20 ° or more.

図1に示す本発明の第1の実施の形態にかかる変形シャルピー衝撃試験片1にあっては、切欠き部10が、高さ方向の中央で浅く上下端で深い山形形状のシェブロンノッチである。切欠き部10の底面に現れる山形形状の頂部の角度Bは60〜150°である。   In the modified Charpy impact test piece 1 according to the first embodiment of the present invention shown in FIG. 1, the notch 10 is a chevron notch having a chevron shape that is shallow at the center in the height direction and deep at the upper and lower ends. . The angle B of the top of the chevron shape that appears on the bottom surface of the notch 10 is 60 to 150 °.

図2に示す本発明の第2の実施の形態にかかる変形シャルピー衝撃試験片2にあっては、切欠き部10の幅が実質的に一定(JIS Z 2202に規定される通常のシャルピー衝撃試験片と同様に8±0.05mm)になっている。   In the modified Charpy impact test piece 2 according to the second embodiment of the present invention shown in FIG. 2, the width of the notch 10 is substantially constant (the normal Charpy impact test defined in JIS Z 2202). It is 8 ± 0.05 mm similarly to the piece.

これら変形シャルピー衝撃試験片1、2にあっては、切欠き部10、20の位置での残存断面積(リガメント面積)が約80mmである。切欠き部10、20は、Vノッチ形状またはUノッチ形状であり、切欠き部10、20の幅(長さ方向の間隔)は5mm以下であり、切欠き部10、20の底部(先端)の曲率半径は1mm以下である。 In these modified Charpy impact test pieces 1 and 2, the remaining cross-sectional area (ligament area) at the positions of the notches 10 and 20 is about 80 mm 2 . The notches 10 and 20 have a V-notch shape or a U-notch shape, the width (interval in the length direction) of the notches 10 and 20 is 5 mm or less, and the bottom (tip) of the notches 10 and 20. The curvature radius is 1 mm or less.

脆性き裂アレスト特性の評価には、脆性き裂の発生特性の影響を排除することが非常に重要である。そのため、容易に発生させるための脆化処理が用いられることがあるが、その脆化の程度も鋼材により変化する上、コストが大きく簡易評価に向かないものも多い。既存のプレスノッチシャルピー試験のようにコストが小さくてすむ方法は、実施例でも述べるように脆化が不十分である。上記の通り構成された変形シャルピー試験片1,2では、切欠き比を大きくした上、標準試験と等しいノッチ底断面積を確保することにより、脆性破壊発生特性の影響を排除した。   To evaluate the brittle crack arrest properties, it is very important to eliminate the influence of the brittle crack initiation properties. For this reason, an embrittlement treatment for easily occurring is sometimes used, but the degree of embrittlement varies depending on the steel material, and the cost is large and many are not suitable for simple evaluation. A method that requires less cost as in the existing press notch Charpy test is insufficient in embrittlement as described in the examples. In the modified Charpy test pieces 1 and 2 configured as described above, the notch ratio was increased and a notch bottom cross-sectional area equal to that of the standard test was secured, thereby eliminating the influence of the brittle fracture occurrence characteristics.

一方、上記の変形を外形形状が矩形のままで行うと、既存試験装置での試験が出来ず、試験機の改造が必要になるため、既存試験機で試験可能なように、試験片の切欠部の両側のみ幅を広くし、試験片両端では標準シャルピー試験片と等しい断面形状とした。   On the other hand, if the above deformation is performed with the outer shape being rectangular, the test with the existing test equipment cannot be performed and the test machine needs to be modified. The width was wide only on both sides of the part, and the cross-sectional shape was the same as the standard Charpy test piece at both ends of the test piece.

以上のように構成された変形シャルピー衝撃試験片1、2を、切欠き部10、20を前方に向けた状態でシャルピー衝撃試験機に取付ける。そして、切欠き部10、20が形成された前面11、21と反対の側面(背面12、22)をハンマーで打撃して破断させることにより、JIS Z 2242に規定されるシャルピー衝撃試験を行う。こうして、破断に要した吸収エネルギー、衝撃値、破面率、遷移温度を測定し、厚鋼板の脆性破壊伝播停止特性(アレスト特性)Kca値を評価することができる。   The modified Charpy impact test pieces 1 and 2 configured as described above are attached to the Charpy impact tester with the notches 10 and 20 facing forward. And the Charpy impact test prescribed | regulated to JISZ2242 is performed by striking and breaking with the hammer the side surface (back surface 12,22) opposite to the front surface 11,21 in which the notch parts 10 and 20 were formed. In this way, the absorbed energy, impact value, fracture rate, and transition temperature required for fracture can be measured, and the brittle fracture propagation stop characteristic (arrest characteristic) Kca value of the thick steel plate can be evaluated.

特に図1に示したように切欠き部10が山形形状のシェブロンノッチである変形シャルピー衝撃試験片1を用いた場合、シャルピー衝撃試験を行った結果、変形シャルピー衝撃試験片1の70Jエネルギー遷移温度vTCN70J(℃)が、次式(1)で計算されるvTCN70J(℃)以下である場合に、日本溶接協会規格「WES鋼種認定試験方法」(1995)に規定される脆性破壊伝播停止試験で求められる脆性破壊伝播停止性能Kca値がT℃で3900(N/mm1.5)以上であると判定することができる。

Figure 0004823986
In particular, as shown in FIG. 1, when the modified Charpy impact test piece 1 in which the notch 10 is a chevron-shaped chevron notch is used, as a result of the Charpy impact test, the 70 J energy transition temperature of the deformed Charpy impact test piece 1 is obtained. When vT CN70J (° C) is equal to or lower than vT CN70J (° C) calculated by the following equation (1), the brittle fracture propagation stop test specified in the Japan Welding Association Standard "WES Steel Grade Certification Test Method" (1995) It can be determined that the brittle fracture propagation stop performance Kca value obtained in ( 1 ) is 3900 (N / mm 1.5 ) or more at T 0 ° C.
Figure 0004823986

表1に示す日本海事協会規格「鋼船規則K編」に準じた鋼材を用いて、本発明の検討を行った。   The present invention was examined using steel materials conforming to the Standards of the Japan Maritime Association shown in Table 1 “Keeling Rules K”.

Figure 0004823986
Figure 0004823986

表1の鋼A〜Gから図1のシェブロンノッチ変形シャルピー衝撃試験片、図2のディープノッチ変形シャルピー衝撃試験片を採取して、JIS Z 2242に準拠したシャルピー衝撃試験機による試験を実施した。また、JIS Z 2242に準拠した標準シャルピー衝撃試験、プレスノッチシャルピー衝撃試験も実施して比較した。遷移曲線を図3〜図6に比較する。   The chevron notch deformation Charpy impact test piece of FIG. 1 and the deep notch deformation Charpy impact test piece of FIG. 2 were sampled from steels A to G of Table 1 and tested with a Charpy impact tester in accordance with JIS Z 2242. In addition, a standard Charpy impact test and a press notch Charpy impact test based on JIS Z 2242 were also carried out for comparison. The transition curves are compared with FIGS.

プレスノッチシャルピー衝撃試験は、エネルギーおよび破面率の温度依存性が急峻である。特に破面率の遷移をみると、脆性破面率0%から80%まで20℃の間で変化しており、また同じ温度で0%と80%が混在している。これは、脆性き裂が発生した場合は高い破面率なり、発生特性の影響を大きく受けている、すなわち、脆性き裂が発生するか否かが遷移の支配因子になっていることを示している。   In the press notch Charpy impact test, the temperature dependence of energy and fracture surface ratio is steep. Looking at the transition of the fracture surface ratio in particular, the brittle fracture surface ratio varies from 0% to 80% between 20 ° C, and 0% and 80% are mixed at the same temperature. This indicates that when a brittle crack occurs, the fracture surface ratio is high and is greatly affected by the generation characteristics.In other words, whether or not a brittle crack occurs is the controlling factor of the transition. ing.

一方、標準シャルピー衝撃試験と、本発明の2種の変形シャルピー衝撃試験では、遷移がなだらかになっている。標準シャルピー衝撃試験の場合は、脆性き裂発生までの変形量が温度により徐々に変化するのが原因であり、本発明の変形シャルピー衝撃試験では、脆性破壊伝播抵抗の支配因子の一つであるシアリップおよびき裂停止後の塑性変形が温度とともに徐々に変化することによっている。すなわち、脆性き裂発生特性の影響を排除し、アレスト特性のみを評価可能な試験となっていると考えられる。   On the other hand, the transition is gentle in the standard Charpy impact test and the two modified Charpy impact tests of the present invention. In the case of the standard Charpy impact test, the amount of deformation until the occurrence of a brittle crack gradually changes with temperature. In the modified Charpy impact test of the present invention, it is one of the dominant factors of the brittle fracture propagation resistance. This is due to the gradual change in plastic deformation after shear and crack arrest with temperature. In other words, it is considered that the test can eliminate the influence of brittle crack initiation characteristics and evaluate only the arrest characteristics.

本発明のディープノッチ変形シャルピー試験片とシェブロンノッチ変形シャルピー試験片の結果を比較すると、シェブロンノッチ変形シャルピー試験片の方が遷移曲線がなめらかで繊維温度が高く、脆性破壊発生特性の影響をより排除していることがわかる。このことから、シェブロンノッチ変形シャルピー試験片のほうがより精度の高いアレスト特性の評価が可能であると思われる。   Comparing the results of the deep notch deformed Charpy test piece and the chevron notch deformed Charpy test piece of the present invention, the chevron notch deformed Charpy test piece has a smoother transition curve and higher fiber temperature, eliminating the influence of brittle fracture occurrence characteristics more You can see that From this, it seems that the chevron notch deformed Charpy test piece is capable of evaluating the arrest characteristics with higher accuracy.

板厚70mmの鋼材B−Gについて、シェブロンノッチ変形シャルピー衝撃試験と脆性破壊伝播停止性能Kca値が3900N/mm1.5となる温度TKca400とを比較して図7に示す。シャブロンノッチ変形シャルピー衝撃試験結果は、アレスト特性と非常に良い相関を示すことが確認される。本相関から、板厚70mmに対し、T℃でKca=3900N/mm1.5とするためのシェブロンノッチ変形シャルピー衝撃試験の70J遷移温度vTCN70Jは次式(2)を満足すればよい。

Figure 0004823986
FIG. 7 shows a comparison between a chevron notch deformation Charpy impact test and a temperature TKca400 at which a brittle fracture propagation stop performance Kca value is 3900 N / mm 1.5 for a steel material BG having a thickness of 70 mm. It is confirmed that the result of the Chabron notch deformation Charpy impact test shows a very good correlation with the arrest characteristics. From this correlation, the 70J transition temperature vT CN70J of the chevron notch deformation Charpy impact test for setting Kca = 3900 N / mm 1.5 at T 0 ° C. with respect to the plate thickness of 70 mm may satisfy the following expression (2).
Figure 0004823986

さらに、ばらつきを考慮すれば、次式(1)を満足することにより、Kca≧3900N/mm1.5を満足できる。

Figure 0004823986
Furthermore, if the variation is taken into consideration, Kca ≧ 3900 N / mm 1.5 can be satisfied by satisfying the following expression (1).
Figure 0004823986

本発明は、金属材料の衝撃試験に適用できる。   The present invention can be applied to an impact test of a metal material.

シェブロンノッチ変形シャルピー衝撃試験片の平面図である。It is a top view of a chevron notch deformation Charpy impact test piece. ディープノッチ変形シャルピー衝撃試験片の平面図である。It is a top view of a deep notch deformation Charpy impact test piece. 鋼Aの標準シャルピー衝撃試験結果である。It is a standard Charpy impact test result of steel A. 鋼Aのプレスノッチシャルピー衝撃試験結果である。It is a press notch Charpy impact test result of steel A. 鋼Aのディープノッチ変形シャルピー衝撃試験結果である。It is a deep notch deformation Charpy impact test result of steel A. 鋼Aのシェブロンノッチ変形シャルピー衝撃試験結果である。It is a chevron notch deformation Charpy impact test result of steel A. シェブロンノッチ変形シャルピー衝撃試験とKcaとの関係である。It is a relationship between a chevron notch deformation Charpy impact test and Kca.

符号の説明Explanation of symbols

1、2 変形シャルピー衝撃試験片
10、20 切欠き部
11、21 前面
12、22 背面
13、23 斜面
1, 2 Deformed Charpy impact test piece 10, 20 Notch 11, 21 Front surface 12, 22 Rear surface 13, 23 Slope

Claims (5)

JIS Z 2242に規定されるシャルピー衝撃試験に用いられる試験片であって、シャルピー衝撃試験機に取付けられた状態において、前面の長さ方向の中央に所定形状の切欠き部を有し、長さが55±0.6mmで、高さが10±0.05mmであり、少なくとも切欠き部の両側部分は、幅が15〜25mmであり、長さ方向の両端から8〜20mmまでの部分は、幅が10±0.05mmであることを特徴とする、厚鋼板の脆性破壊伝播停止特性評価用の変形シャルピー衝撃試験片。 A test piece used in the Charpy impact test specified in JIS Z 2242, having a notch with a predetermined shape at the center in the longitudinal direction of the front surface when attached to the Charpy impact tester. in but 55 ± 0.6 mm, a is 10 ± 0.05 mm height, both side portions of the at least cut-outs, Ri width 15~25mm der, portions from both ends to 8~20mm length direction , width and wherein 10 ± 0.05 mm der Rukoto, thickness variations Charpy impact test specimens brittle fracture propagation stop characteristics for evaluation of the steel sheet. 前記切欠き部が、高さ方向の中央で浅く上下端で深い山形形状のシェブロンノッチであることを特徴とする、請求項1に記載の厚鋼板の脆性破壊伝播停止特性評価用の変形シャルピー衝撃試験片。  2. The modified Charpy impact for evaluating brittle fracture propagation stop characteristics of a thick steel plate according to claim 1, wherein the notch is a chevron notch that is shallow at the center in the height direction and deep at the upper and lower ends. Test pieces. 前記切欠き部の位置での残存断面積が80mm  The remaining cross-sectional area at the position of the notch is 80 mm. 2 であることを特徴とする、請求項1または2に記載の厚鋼板の脆性破壊伝播停止特性評価用の変形シャルピー衝撃試験片。The modified Charpy impact test piece for evaluating the brittle fracture propagation stop property of a thick steel plate according to claim 1 or 2, characterized in that: 請求項1〜3のいずれか1項に記載の変形シャルピー衝撃試験片を用い、JIS Z 2242に規定されるシャルピー衝撃試験に準拠して、厚鋼板の脆性破壊伝播停止特性(アレスト特性)を評価することを特徴とする、厚鋼板の脆性破壊伝播停止特性の品質管理方法。  Using the deformed Charpy impact test piece according to any one of claims 1 to 3, the brittle fracture propagation stop property (arrest property) of a thick steel plate is evaluated based on the Charpy impact test specified in JIS Z 2242. A quality control method for brittle fracture propagation stop characteristics of a thick steel plate. 請求項2に記載のシェブロンノッチを有する変形シャルピー衝撃試験片の70Jエネルギー遷移温度vT  70 J energy transition temperature vT of a deformed Charpy impact specimen having a chevron notch according to claim 2. CN70JCN70J (℃)が、次式(1)で計算されるvT(° C.) is calculated by the following equation (1) CN70JCN70J (℃)以下である場合に、日本溶接協会規格「WES鋼種認定試験方法」(1995)に規定される脆性破壊伝播停止試験で求められる脆性破壊伝播停止性能Kca値がTWhen the temperature is below (° C.), the brittle fracture propagation stop performance Kca value obtained in the brittle fracture propagation stop test specified in the Japan Welding Association Standard “WES Steel Grade Certification Test Method” (1995) is T 0 ℃で3900(N/mm3900 at N ° C (N / mm 1.51.5 )以上であると判定することを特徴とする、請求項4に記載の厚鋼板の脆性破壊伝播停止特性の品質管理方法。5) The quality control method for brittle fracture propagation stop characteristics of a thick steel plate according to claim 4, characterized in that it is determined as above.
Figure 0004823986
Figure 0004823986
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