JP3530347B2 - How to select a high-strength steel sheet with excellent dynamic deformation characteristics - Google Patents
How to select a high-strength steel sheet with excellent dynamic deformation characteristicsInfo
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- JP3530347B2 JP3530347B2 JP19029797A JP19029797A JP3530347B2 JP 3530347 B2 JP3530347 B2 JP 3530347B2 JP 19029797 A JP19029797 A JP 19029797A JP 19029797 A JP19029797 A JP 19029797A JP 3530347 B2 JP3530347 B2 JP 3530347B2
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動車部材等に使
用され、衝突時の衝撃エネルギを吸収することで安全性
確保に寄与することのできる動的変形特性に優れた高強
度鋼板の選定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 for selecting a high-strength steel sheet which is used for automobile members and the like, and which can contribute to ensuring safety by absorbing impact energy at the time of collision and which has excellent dynamic deformation characteristics. It is about.
【０００２】[0002]
【従来の技術】近年、衝突時の乗員保護が自動車の最重
要性能として認識され、それに対応するための高い衝撃
吸収性能を持つ材料が要求されている。例えば乗用車の
前面衝突においては、フロントサイドメンバと呼ばれる
部材にこのような材料を適用すれば、該部材が圧潰する
ことで衝撃エネルギが吸収され、乗員にかかる衝撃をや
わらげることができる。2. Description of the Related Art In recent years, occupant protection in the event of a collision has been recognized as the most important performance of an automobile, and a material having a high impact absorption performance has been demanded in order to cope with it. For example, in the case of a frontal collision of a passenger car, if such a material is applied to a member called a front side member, the member is crushed to absorb the impact energy, and the impact on the occupant can be softened.
【０００３】自動車衝突時に各部位が受けるひずみ速度
は１０3 (s-1) 程度に達するため、材料の衝撃吸収性能
を考える場合、このような高速度域での動的変形特性の
解明が必要である。そして、自動車の軽量化と安全性向
上を両立させることのできる、動的変形特性に優れた高
強度鋼板が必要とされ、最近この点に関する報告が見ら
れる。Since the strain rate applied to each part in an automobile collision reaches about 10 3 (s -1 ), it is necessary to elucidate the dynamic deformation characteristics in such a high speed range when considering the impact absorption performance of a material. Is. A high-strength steel sheet having excellent dynamic deformation characteristics capable of satisfying both weight reduction and safety improvement of an automobile is required, and a report on this point is recently seen.
【０００４】例えば本発明者らは、CAMP-ISIJ Vol.9(19
96) P.1112〜1115に、高強度薄鋼板の高速変形特性と衝
撃エネルギ吸収能について報告し、その中で、１０3 (s
-1)の高ひずみ速度での動的強度は、１０-3(s-1) の低
ひずみ速度での静的強度と比較して大きく上昇するこ
と、鋼材の強度上昇によりクラッシュ時の吸収エネルギ
が向上すること、材料のひずみ速度依存性は鋼の組織に
依存すること、ＴＲＩＰ型鋼（加工誘起変態型鋼）およ
びＤＰ型鋼（デュアルフェーズ型鋼）は優れた成形性と
高い衝撃吸収能を兼ね備えることを述べている。For example, the inventors of the present invention have used CAMP-ISIJ Vol.9 (19
96) P.1112-1115 reported on high-speed deformation characteristics and impact energy absorption capacity of high-strength thin steel sheets, in which 10 3 (s
Dynamic strength at high strain rate of -1), 10 -3 (s -1) of the greatly increased as compared to the static strength at a low strain rate, the absorbed energy of the crash by the intensity increase of the steel That the strain rate dependence of the material depends on the microstructure of the steel, and that TRIP type steel (work-induced transformation type steel) and DP type steel (dual phase type steel) have both excellent formability and high shock absorption capacity. Says.
【０００５】[0005]
【発明が解決しようとする課題】上記のように、高強度
鋼板について自動車衝突時の高ひずみ速度における動的
変形特性が解明されつつあるものの、衝撃エネルギ吸収
のための自動車部材として、鋼板のどのような特性に注
目し、どのような基準で材料選定を行えばよいかについ
ては、明らかにされていない。As described above, although the dynamic deformation characteristics of high-strength steel sheets at a high strain rate at the time of automobile collision are being elucidated, it is possible to use any steel sheet as an automobile member for absorbing impact energy. It has not been clarified what kind of criteria should be used for material selection, paying attention to such characteristics.
【０００６】また上記自動車部材は、鋼板に曲げやプレ
ス等の成形を施して製造され、衝突時の衝撃は、これら
成形加工された部材に対して加えられる。しかし、この
ような成形加工後における衝撃エネルギ吸収能を解明し
た、実部材としての動的変形特性に優れた鋼板について
は、従来知られていない。The above-mentioned automobile member is manufactured by subjecting a steel plate to forming such as bending and pressing, and the impact at the time of collision is applied to these formed members. However, a steel sheet having excellent dynamic deformation characteristics as an actual member, which has clarified the impact energy absorption capacity after such forming, has not been known so far.
【０００７】本発明は、フロントサイドメンバ等の成形
加工された自動車部品に使用される高強度鋼板であっ
て、衝突時の衝撃エネルギ吸収用として、適正な特性お
よび基準に基づいて選定され、安全性確保に確実に寄与
することのできる、動的変形特性に優れた高強度鋼板を
提供することを目的とする。The present invention is a high-strength steel sheet used for molded automobile parts such as front side members and the like, which is selected for absorbing impact energy at the time of collision based on proper characteristics and standards, and is safe. It is an object of the present invention to provide a high-strength steel sheet having excellent dynamic deformation characteristics, which can surely contribute to ensuring the properties.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
の本発明は、相当ひずみにて０％超〜１０％以下の予変
形を加えたのち、５×１０-4〜５×１０-3(s-1) のひず
み速度で変形したときの準静的変形強度σs と、前記予
変形を加えたのち、５×１０2 〜５×１０3 (s-1) のひ
ずみ速度で変形したときの動的変形強度σd との差（σ
d −σs ）が６０MPa 以上の条件を満たしていることを
特徴とする動的変形特性に優れた高強度鋼板の選定方法
である。According to the present invention for achieving the above object, a pre-deformation of more than 0% to 10% or less is applied at an equivalent strain, and then 5 × 10 -4 to 5 × 10 -3. and quasi-static deformation strength σs when deformed in a strain rate of (s -1), after the addition of said pre-deformation, 5 × 10 2 ~5 × 10 3 when deformed at a strain rate of (s -1) Difference from the dynamic deformation strength of σd (σ
d- [sigma] s) satisfies the condition of 60 MPa or more , which is a method for selecting a high-strength steel sheet having excellent dynamic deformation characteristics.
【０００９】また、相当ひずみにて０％超〜１０％以下
の予変形を加えたのち、５×１０-4〜５×１０-3(s-1)
のひずみ速度で変形したときの準静的変形強度σs と、
前記予変形を加えたのち、５×１０2 〜５×１０
3 (s-1) のひずみ速度で変形したときの動的変形強度σ
d との差（σd −σs ）が
（σd −σs ）≧４．１×σs 0.8 −σs ……………（１）の条件
を満足する範囲にあることを特徴とする動的変形
特性に優れた高強度鋼板の選定方法である。Also, after pre-deformation of more than 0% to 10% or less at an equivalent strain, 5 × 10 -4 to 5 × 10 -3 (s -1 )
Quasi-static deformation strength σs when deformed at a strain rate of
After applying the pre-deformation, 5 × 10 2 to 5 × 10
Dynamic deformation strength σ when deformed at a strain rate of 3 (s -1 ).
the dynamic deformation properties, characterized in that the range difference between d (σd -σs) is to satisfy the condition of (σd -σs) ≧ 4.1 × σs 0.8 -σs ............... (1) This is a method of selecting an excellent high-strength steel sheet.
【００１０】[0010]
【発明の実施の形態】自動車のフロントサイドメンバ等
の衝撃吸収用部材は、鋼板に曲げ加工やプレス加工など
を施して製造される。自動車衝突時の衝撃は、これら成
形加工された部材に対して加えられるため、本発明の鋼
板は、このような成形加工に相当する予変形後の状態
で、高い衝撃吸収性能を有していることが必要である。
しかし現在までのところ、成形による変形応力の上昇と
ひずみ速度上昇による変形応力の上昇とを同時に考慮し
て、実部材としての衝撃吸収特性に優れた鋼板を得る試
みはなされていない。BEST MODE FOR CARRYING OUT THE INVENTION A shock absorbing member such as a front side member of an automobile is manufactured by subjecting a steel plate to bending or pressing. Since the impact at the time of automobile collision is applied to these molded members, the steel sheet of the present invention has a high shock absorbing performance in a state after pre-deformation corresponding to such a molding process. It is necessary.
However, up to the present, no attempt has been made to obtain a steel sheet having an excellent shock absorbing property as an actual member in consideration of an increase in the deformation stress due to forming and an increase in the deformation stress due to an increase in strain rate at the same time.
【００１１】本発明者らは実験検討の結果、予変形の量
は、部材中の部位によっては２０％以上になる場合もあ
るが、相当ひずみにして０％超〜１０％以下の部位が大
半であり、またその領域での挙動を見ることによってそ
れ以外の領域の予測が可能であることを見出した。した
がって本発明において、相当ひずみにして０％超〜１０
％以下の予変形を加えることとした。As a result of experiments conducted by the present inventors, the amount of pre-deformation may be 20% or more depending on the part in the member, but in most parts, the equivalent strain is more than 0% to 10% or less. It was also found that it is possible to predict other regions by observing the behavior in that region. Therefore, in the present invention, the equivalent strain is more than 0% to 10%.
% Pre-deformation was added.
【００１２】図１は、後述の実施例における表１の各鋼
種について、衝突時における成形部材の吸収エネルギＥ
abと素材強度Ｓとの関係を示したものである。素材強度
Ｓは、通常の引張り試験による引張り強さである。部材
吸収エネルギＥabは、図２に示すような成形部材の長さ
方向（矢印の方向）に、質量４００kgの重錘を速度１５
ｍ／ｓで衝突させ、そのときの圧潰量１００mmまでの吸
収エネルギである。なお図２の成形部材は、厚さ２．０
mmの鋼板を成形したハット型部１に、同厚さ同鋼種の鋼
板２をスポット溶接により接合したものであり、ハット
型部１のコーナー半径は２mmである。３はスポット溶接
部である。FIG. 1 shows the absorbed energy E of the forming member at the time of collision for each steel type shown in Table 1 in Examples described later.
The relationship between ab and material strength S is shown. The material strength S is the tensile strength obtained by a normal tensile test. The member absorbed energy Eab is obtained by moving a weight having a mass of 400 kg at a speed of 15 in the length direction (direction of the arrow) of the molding member as shown in FIG.
It is the energy absorbed up to a crushing amount of 100 mm at the time of collision at m / s. The molded member of FIG. 2 has a thickness of 2.0.
A steel sheet 2 having the same thickness and the same steel type is joined by spot welding to a hat die portion 1 formed by forming a steel sheet of mm, and the corner radius of the hat die portion 1 is 2 mm. 3 is a spot weld.
【００１３】図１から、部材吸収エネルギＥabは、通常
の引張り試験で得られる素材強度の高いものほど高くな
る傾向がみられるが、ばらつきの大きいことがわかる。
そこで図１に示す各素材について、相当ひずみにして０
％超〜１０％以下の予変形を加えたのち、５×１０-4〜
５×１０-3(s-1) のひずみ速度で変形したときの準静的
変形強度σs と、５×１０2 〜５×１０3 (s-1) のひず
み速度で変形したときの動的変形強度σd を測定した。It can be seen from FIG. 1 that the member absorbed energy Eab tends to be higher as the strength of the material obtained by a normal tensile test is higher, but it is understood that there is a large variation.
Therefore, each material shown in Fig. 1 has a strain equivalent to 0.
% To 10% or less, and then 5 × 10 -4 ~
Quasi-static deformation strength σs when deformed at a strain rate of 5 × 10 -3 (s -1 ), and dynamics when deformed at a strain rate of 5 × 10 2 to 5 × 10 3 (s -1 ). The deformation strength σd was measured.
【００１４】その結果、（σd −σs ）によって層別す
ることができた。図１の各プロットの記号で、白丸印
は、０％超〜１０％以下の範囲のいずれかの予変形量で
（σd −σs ）＜６０MPa となるもの、黒丸印は、前記
範囲のすべての予変形量で６０MPa ≦（σd −σs ）で
あり、かつ予変形量が５％のとき、６０MPa ≦（σd −
σs ）＜８０MPa であるもの、黒四角印は、前記範囲の
すべての予変形量で６０MPa ≦（σd −σs ）であり、
かつ予変形量が５％のとき、８０MPa ≦（σd −σs ）
＜１００MPa であるもの、黒三角印は、前記範囲のすべ
ての予変形量で６０MPa ≦（σd −σs ）であり、かつ
予変形量が５％のとき、１００MPa ≦（σd −σs ）で
あるもの、である。As a result, it was possible to stratify by (σd-σs). In the symbols of each plot in FIG. 1, white circles indicate that the amount of pre-deformation is (σd −σs) <60 MPa in any range in the range of more than 0% to 10% or less, and black circles indicate all of the above ranges. When the pre-deformation amount is 60 MPa ≤ (σd-σs) and the pre-deformation amount is 5%, 60 MPa ≤ (σd-
σ s) <80 MPa, black square marks are 60 MPa ≦ (σ d −σ s) in all pre-deformation amounts in the above range,
And when the pre-deformation amount is 5%, 80MPa ≤ (σd-σs)
<100 MPa, black triangles are 60 MPa ≤ (σd -σs) for all predeformation amounts in the above range, and 100 MPa ≤ (σd -σs) when the predeformation amount is 5%. ,.
【００１５】そして、０％超〜１０％以下の範囲のすべ
ての予変形量において６０MPa ≦（σd −σs ）である
ものは、衝突時の部材吸収エネルギＥabが、素材強度Ｓ
から予測される値以上であり、衝突時の衝撃吸収用部材
として優れた動的変形特性を有する鋼板であった。前記
予測される値は、図１の曲線で示す値であり、
Ｅab＝０．０６２Ｓ0.8 （２）
で示される。したがって本発明において、（σd −σs
）を６０MPa 以上とした。For all pre-deformation amounts in the range of more than 0% to less than 10%, 60 MPa ≤ (σd-σs) means that the member absorbed energy Eab at the time of collision is the material strength S.
It was a steel plate having a dynamic deformation characteristic excellent as a shock absorbing member at the time of collision. The predicted value is the value shown by the curve in FIG. 1, and is shown by Eab = 0.062S 0.8 (2). Therefore, in the present invention, (σd −σs
) Was set to 60 MPa or more.
【００１６】また、通常、動的変形強度は静的変形強度
の累乗の形で表されることが知られており、静的変形強
度が高くなるにつれて、動的変形強度と静的変形強度の
差は小さくなる。しかし、材料の高強度化による軽量化
を考えた場合、動的変形強度と静的変形強度の差が小さ
くなると材料置換による衝撃吸収能の向上が大きくは期
待できず、軽量化の達成が困難となる。この点に関して
研究の結果、（σd −σs ）が上記（１）式を満足する
範囲であれば、材料置換による軽量化が達成できること
がわかった。本発明の対象鋼種としては、実施例の表１
に示すような熱延材、冷延材、固溶強化鋼、析出強化
鋼、組織強化鋼等を採用することができる。Further, it is known that the dynamic deformation strength is usually expressed in the form of a power of the static deformation strength. As the static deformation strength becomes higher, the dynamic deformation strength and the static deformation strength become higher. The difference is small. However, when considering the weight reduction by increasing the strength of the material, if the difference between the dynamic deformation strength and the static deformation strength becomes small, the impact absorption capacity improvement by the material replacement cannot be expected to be large, and it is difficult to achieve the weight reduction. Becomes As a result of research on this point, it has been found that weight reduction by material replacement can be achieved if (σd −σs) is in a range satisfying the above expression (1). As the steel types to be targeted by the present invention, Table 1 in Examples is shown.
The hot-rolled material, the cold-rolled material, the solid solution strengthened steel, the precipitation strengthened steel, the microstructure-strengthened steel, etc. can be adopted.
【００１７】[0017]
［実施例１］：表１に示す１３種類の鋼板について、予
変形後、塗装焼付けを想定して１７０℃２０分の処理
（ＢＨ処理）を行った後にσd およびσs を測定した。
σd およびσs の測定は、鋼板の圧延方向と平行な方向
を軸とする引張試験により行った。また上記と同様にし
て、図２に示す成形部材を製作し、ＢＨ処理を行った
後、部材吸収エネルギを測定した。予変形は鋼板の圧延
方向と直角方向に単軸引張りにて行い、相当ひずみ量が
表２中の値となるように付加した。[Example 1]: About 13 kinds of steel sheets shown in Table 1, after pre-deformation, σd and σs were measured after performing a treatment (BH treatment) at 170 ° C. for 20 minutes assuming coating baking.
The measurement of σd and σs was performed by a tensile test with a direction parallel to the rolling direction of the steel sheet as an axis. Further, similarly to the above, the molded member shown in FIG. 2 was manufactured, subjected to BH treatment, and then the member absorbed energy was measured. The pre-deformation was performed by uniaxial tension in the direction perpendicular to the rolling direction of the steel sheet, and added so that the equivalent strain amount would be the value in Table 2.
【００１８】結果は、表２に示すとおり、いずれの予変
形量においても（σd −σs ）が６０MPa 以上の本発明
例、および（σd −σs ）が（１）式を満足する範囲の
本発明例は、部材吸収エネルギが素材強度から予測され
る値以上を示し、これらの条件を外れた比較例は前記予
測される値未満であった。The results are, as shown in Table 2, the present invention examples in which (σd −σs) is 60 MPa or more, and in the range where (σd −σs) satisfies the expression (1) at any predeformation amount. The examples show that the energy absorbed by the members is equal to or more than the value predicted from the material strength, and the comparative examples that deviate from these conditions were less than the values predicted above.
【００１９】［実施例２］：実部材は種々の変形様式に
より成形されるため、表１の鋼種No．１０および１１に
ついて、予変形を３種類の変形様式により行った結果を
表３に示す。予変形量はいずれも５％とし、鋼板の圧延
方向と直角方向（Ｃ方向）および平行方向（Ｌ方向）に
単軸引張りで行った場合、平面ひずみで行った場合、お
よび等二軸引張りで行った場合を示す。予変形後はＢＨ
処理を行い、ついで鋼板の圧延方向と平行な方向を軸と
する引張試験によりσd およびσs を測定した。[Example 2]: Since the actual member is formed by various deformation modes, the steel type No. Table 3 shows the results of performing pre-deformation on 10 and 11 by three types of deformation modes. The amount of pre-deformation was 5% in all cases, and uniaxial tension was applied in the direction (C direction) and parallel direction (L direction) perpendicular to the rolling direction of the steel sheet, in case of plane strain, and in the case of equal biaxial tension. The case where it went is shown. BH after pre-deformation
Then, σd and σs were measured by a tensile test with a direction parallel to the rolling direction of the steel sheet as an axis.
【００２０】鋼種No．１０の比較例は、（σd −σs ）
が６０MPa 未満の場合があり、かつ（１）式を満足しな
いのに対し、鋼種No．１１の本発明例は、（σd −σs
）が６０MPa 以上であり、かつ（１）式を満足する。
そして、表１および表２に示すのとおり、本発明例のN
o．１１は、素材強度が比較例のNo．１０より低いにも
かかわらず、部材吸収エネルギが高く、素材強度から予
測される値以上である。Steel grade No. The comparative example of 10 is (σd −σs)
Of less than 60 MPa and the formula (1) is not satisfied, while the steel grade No. The eleventh example of the present invention is (σd−σs
) Is 60 MPa or more and satisfies the equation (1).
And, as shown in Table 1 and Table 2, N of the present invention example
o. In No. 11, the material strength is No. of the comparative example. Although it is lower than 10, the member absorbed energy is high and is equal to or higher than the value predicted from the material strength.
【００２１】［実施例３］：ＢＨ処理なしのほかは上記
実施例１と同条件で行った。結果は表４に示すとおり、
いずれの予変形量においても（σd −σs ）が６０MPa
以上の本発明例、および（σd −σs ）が（１）式を満
足する範囲の本発明例は、部材吸収エネルギが素材強度
から予測される値以上を示し、これらの条件を外れた比
較例は前記予測される値未満であった。[Example 3]: The same conditions as in Example 1 were used except that the BH treatment was not performed. The results are shown in Table 4,
(Σd −σs) is 60MPa at any pre-deformation amount
The above-described present invention example and the present invention example in the range where (σd −σs) satisfies the expression (1) show the member absorbed energy equal to or more than the value predicted from the material strength, and the comparative example deviating from these conditions. Was less than the expected value.
【００２２】なお上記実施例において、表１の鋼種No.
６は冷間圧延により強化したものであり、延性不足によ
り条件を満たさない比較例である。また析出強化型の鋼
種No．７，９，１０のうち、No．７はＳｉの固溶強化に
より低Ｃ化をはかり、第２相の量を減じているので、
（σd −σs ）≧６０MPa を満たす本発明例であるが、
その他は条件を満たさない比較例である。In the above embodiment, the steel grade No. shown in Table 1 is used.
No. 6 is a comparative example which is strengthened by cold rolling and does not satisfy the condition due to insufficient ductility. Precipitation-strengthened steel grade No. No. of 7, 9, 10 7 has a low C content due to the solid solution strengthening of Si and reduces the amount of the second phase.
It is an example of the present invention which satisfies (σd −σs) ≧ 60 MPa,
Others are comparative examples that do not satisfy the conditions.
【００２３】[0023]
【表１】 [Table 1]
【００２４】[0024]
【表２】 [Table 2]
【００２５】[0025]
【表３】 [Table 3]
【００２６】[0026]
【表４】 [Table 4]
【００２７】[0027]
【発明の効果】本発明により、自動車の軽量化と安全性
確保の要求にともに応えることのできる、衝突時の衝撃
吸収能の優れた高強度鋼板を、確実に選定し提供するこ
とができる。According to the present invention, it is possible to reliably select and provide a high-strength steel sheet having an excellent impact absorbing ability at the time of a collision, which can meet both the requirements for weight reduction and safety assurance of an automobile.
【図１】本発明における部材吸収エネルギと素材強度の
関係を示すグラフである。FIG. 1 is a graph showing the relationship between member absorbed energy and material strength in the present invention.
【図２】本発明における衝撃吸収エネルギ測定用の成形
部材を示す斜視図である。FIG. 2 is a perspective view showing a molded member for measuring impact absorbed energy according to the present invention.
１…ハット型部 ２…鋼板 ３…スポット溶接部 1 ... Hat type part 2 ... steel plate 3 ... Spot weld
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平８−291361（ＪＰ，Ａ) 特開 平７−18372（ＪＰ，Ａ) 特開 平７−207405（ＪＰ，Ａ) 板橋ら，予ひずみを与えられた建築構 造用圧延鋼材ＳＮ490Ｂの高速引張特性, 日本材料学会学術講演会講演論文集，日 本，Ｖｏｌ．46ｔｈ ，1997年 ５月, Ｐ．291−292 三浦ら，自動車用衝撃吸収高張力鋼板 の開発，まてりあ，1996年 ５月20日, Ｖｏｌ．35 Ｎｏ．３，Ｐ．570−572 助台ら，低炭素鋼の引張変形挙動と衝 撃値におよぼす低応力振幅予加工の影 響，日本金属学会誌，1986年 ４月，Ｖ ｏｌ．50 Ｎｏ．４， ｐ．369−373 (58)調査した分野(Int.Cl.7，ＤＢ名) C22C 1/00,38/00 - 38/60 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-8-291361 (JP, A) JP-A-7-18372 (JP, A) JP-A-7-207405 (JP, A) Itabashi et al., Pre-strain High-speed Tensile Properties of SN490B, a Rolled Steel for Building Structures, given in Japan, Proceedings of Academic Lectures of the Material Society of Japan, Japan, Vol. 46th, May 1997, P. 291-292 Miura et al., Development of shock absorbing high-strength steel sheet for automobiles, Materia, May 20, 1996, Vol. 35 No. 3, P.I. 570-572 Sudai et al., Effect of low stress amplitude pre-forming on tensile deformation behavior and impact value of low carbon steel, Journal of Japan Institute of Metals, April 1986, Vol. 50 No. 4, p. 369-373 (58) Fields investigated (Int.Cl. 7 , DB name) C22C 1/00, 38/00-38/60
Claims (2)
変形を加えたのち、５×１０-4〜５×１０-3(s-1) のひ
ずみ速度で変形したときの準静的変形強度σs と、前記
予変形を加えたのち、５×１０2 〜５×１０3 (s-1) の
ひずみ速度で変形したときの動的変形強度σd との差
（σd −σs ）が６０MPa 以上の条件を満たしているこ
とを特徴とする動的変形特性に優れた高強度鋼板の選定
方法。1. Quasi-static when deformed at a strain rate of 5 × 10 −4 to 5 × 10 −3 (s −1 ) after pre-deformation of more than 0% to 10% or less at an equivalent strain. The difference (σd −σs) between the dynamic deformation strength σs and the dynamic deformation strength σd when the deformation is performed at a strain rate of 5 × 10 2 to 5 × 10 3 (s −1 ) after the pre-deformation is added. Selection of high-strength steel sheet with excellent dynamic deformation characteristics characterized by satisfying the condition of 60 MPa or more
Way .
変形を加えたのち、５×１０-4〜５×１０-3(s-1) のひ
ずみ速度で変形したときの準静的変形強度σs と、前記
予変形を加えたのち、５×１０2 〜５×１０3 (s-1) の
ひずみ速度で変形したときの動的変形強度σd との差
（σd −σs ）が （σd −σs ）≧４．１×σs 0.8 −σs ……………（１）の条件を 満足する範囲にあることを特徴とする動的変形
特性に優れた高強度鋼板の選定方法。2. Quasi-static when deformed at a strain rate of 5 × 10 −4 to 5 × 10 −3 (s −1 ) after pre-deformation of more than 0% to 10% or less at an equivalent strain. The difference (σd −σs) between the dynamic deformation strength σs and the dynamic deformation strength σd when the deformation is performed at a strain rate of 5 × 10 2 to 5 × 10 3 (s −1 ) after the pre-deformation is added. (σd -σs) ≧ 4.1 × σs 0.8 -σs ............... (1) selection of high-strength steel sheet having excellent dynamic deformation properties, characterized in that a condition in a range satisfying the.
Priority Applications (18)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19029797A JP3530347B2 (en) | 1997-07-15 | 1997-07-15 | How to select a high-strength steel sheet with excellent dynamic deformation characteristics |
| CA002278841A CA2278841C (en) | 1997-01-29 | 1998-01-23 | High strength steels having excellent formability and high impact energy absorption properties, and a method for producing the same |
| PCT/JP1998/000272 WO1998032889A1 (en) | 1997-01-29 | 1998-01-23 | High-strength steel sheet highly resistant to dynamic deformation and excellent in workability and process for the production thereof |
| US09/355,435 US6544354B1 (en) | 1997-01-29 | 1998-01-23 | High-strength steel sheet highly resistant to dynamic deformation and excellent in workability and process for the production thereof |
| AU55767/98A AU716203B2 (en) | 1997-01-29 | 1998-01-23 | High strength steels having excellent formability and high impact energy absorption properties, and a method for production the same |
| EP98900718.2A EP0974677B2 (en) | 1997-01-29 | 1998-01-23 | A method for producing high strength steels having excellent formability and high impact energy absorption properties |
| KR1019997006826A KR100334948B1 (en) | 1997-01-29 | 1998-01-23 | High-strength steel sheet highly resistant to dynamic deformation and excellent in workability and process for the production thereof |
| EP10181439A EP2312008B1 (en) | 1997-01-29 | 1998-01-23 | High-strength steels having high impact energy absorption properties. |
| CN98802157A CN1072272C (en) | 1997-01-29 | 1998-01-23 | High-strength steel sheet highly resistant to dynamic deformation and excellent in workability and process for production thereof |
| TW087101096A TW349126B (en) | 1997-01-29 | 1998-01-26 | High strength steels having excellent formability and high impact energy absorption properties, and a method for producing the same |
| CA002283924A CA2283924C (en) | 1997-03-17 | 1998-03-16 | Dual-phase type high-strength steel sheets having high impact energy absorption properties and a method of producing the same |
| TW087103834A TW426742B (en) | 1997-03-17 | 1998-03-16 | Dual-phase type high strength steel sheets having high impact energy absorption properties and a method of producing the same |
| PCT/JP1998/001101 WO1998041664A1 (en) | 1997-03-17 | 1998-03-16 | Dual-phase high-strength steel sheet having excellent dynamic deformation properties and process for preparing the same |
| EP98907247.5A EP0969112B2 (en) | 1997-03-17 | 1998-03-16 | A method of producing dual-phase high-strength steel sheets having high impact energy absorption properties |
| CN98803465A CN1080321C (en) | 1997-03-17 | 1998-03-16 | Dual-phase high-strength steel sheet having excellent dynamic deformation properties, and process for preparing same |
| AU63118/98A AU717294B2 (en) | 1997-03-17 | 1998-03-16 | Dual-phase high-strength steel sheet having excellent dynamic deformation properties and process for preparing the same |
| KR1019997008474A KR100334949B1 (en) | 1997-03-17 | 1998-03-16 | Dual-phase high-strength steel sheet having excellent dynamic deformation properties and process for preparing the same |
| EP10181225.3A EP2314729B2 (en) | 1997-03-17 | 1998-03-16 | Dual-phase type high-strength steel sheets having high impact energy absorption properties |
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| JP19029797A JP3530347B2 (en) | 1997-07-15 | 1997-07-15 | How to select a high-strength steel sheet with excellent dynamic deformation characteristics |
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Non-Patent Citations (3)
| Title |
|---|
| 三浦ら，自動車用衝撃吸収高張力鋼板の開発，まてりあ，１９９６年 ５月２０日，Ｖｏｌ．３５ Ｎｏ．３，Ｐ．５７０−５７２ |
| 助台ら，低炭素鋼の引張変形挙動と衝撃値におよぼす低応力振幅予加工の影響，日本金属学会誌，１９８６年 ４月，Ｖｏｌ．５０ Ｎｏ．４， ｐ．３６９−３７３ |
| 板橋ら，予ひずみを与えられた建築構造用圧延鋼材ＳＮ４９０Ｂの高速引張特性，日本材料学会学術講演会講演論文集，日本，Ｖｏｌ．４６ｔｈ ，１９９７年 ５月，Ｐ．２９１−２９２ |
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