JP6625657B2 - 高強度特性を有するベイナイト系構造を有する部品および製造方法 - Google Patents
高強度特性を有するベイナイト系構造を有する部品および製造方法 Download PDFInfo
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- JP6625657B2 JP6625657B2 JP2017549687A JP2017549687A JP6625657B2 JP 6625657 B2 JP6625657 B2 JP 6625657B2 JP 2017549687 A JP2017549687 A JP 2017549687A JP 2017549687 A JP2017549687 A JP 2017549687A JP 6625657 B2 JP6625657 B2 JP 6625657B2
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Description
炭素含有量は、0.10%から0.30%の間である。炭素含有量が0.10重量%未満であると、初析フェライトが生成するおそれがあり、得られる機械的強度が不十分である。炭素含有量が0.30%を上回ると溶接性が一層低下するのは、熱影響部(Heat Affected Zone、HAZ)または溶融部において、低靭性の微細構造が形成されるためである。この範囲内では、溶接性は良好であり、且つ機械的特性は安定であって、本発明の目的に合致している。好ましい実施形態により、炭素含有量は、0.15%から0.27%の間、好ましくは0.17%から0.25%の間である。
0.1≦S1≦0.4
および
0.5≦S2≦1,8
0.7≦S3≦1,6
0.3≦S4≦1,5
ここで
S1=Nb+V+Mo+Ti+Al
S2=C+N+Cr/2+(S1)/6+(Si+Mn−4*S)/10+Ni/20
S3=S2+1/3xVr600
S4=S3−Vr400
を満足し得て、式中、元素の濃度は重量パーセントで表され、冷却速度であるVr400およびVr600は、℃/sで表される。Vr400は、420℃から380℃の間の温度範囲における冷却速度を表す。Vr600は、620℃から580℃の間の温度範囲における冷却速度を表す。
70%から100%の間の濃度のベイナイト。本発明の文脈において、「ベイナイト」という用語は、炭化物の表面上で5%未満を含むベイナイトを意味し、ラス間層はオーステナイトである。
5%未満の濃度のフェライト。特に、フェライトレベルが5%を超える場合、本発明による鋼は、目標とする1100MPa未満の機械的強度を示す。
本発明による組成の鋼を、ブルーム、長方形、正方形もしくは円形の断面を有するビレットまたはインゴットの形態で準備し、次に
この鋼を、半製品の形態で、棒またはワイヤの形態へ圧延し、次に
半製品を、1100℃から1300℃の間の再加熱温度(Trech)にして再加熱した半製品を得て、次に
再加熱した半製品を、熱間成形の終了時の温度が850℃以上の条件で熱間成形して、熱間成形部品を得て、次に
前記熱間成形部品を、620℃から580℃の間の温度に達するまで、0.10℃/sから10℃/sの冷却速度Vr600で冷却し、次に
前記部品を、420℃から380℃の間の温度まで4℃/s未満の冷却速度Vr400で冷却し、次に
部品を、0.3℃/s以下の速度で380℃から300℃の間の温度に冷却し、次に
部品を、4℃/s以下の速度で周囲温度まで冷却し、次に、
場合により、前記熱間成形された部品を、300℃から450℃の間の焼戻し温度で30分から120分の間の時間にわたって、加熱焼戻し処理し、周囲温度まで冷却し、次に
部品の機械加工を行う。
試験に用いた鋼の化学組成を表1に示す。これらの等級の再加熱温度は1250℃であった。熱間成形終了時の温度は1220℃であった。冷却速度Vr600およびVr400を表2に示す。これらの部品を0.15℃/sにて380℃から周囲温度まで冷却し、次いで機械加工を行った。試験の実施条件およびキャラクタリゼーションの測定結果を表2にまとめる。
Claims (16)
- 部品であって、組成に含有量が質量パーセントで表される:
0.10≦C≦0.30
1.6≦Mn≦2.1
0.5≦Cr≦1.7
0.5≦Si≦1.0
0.065≦Nb≦0.15
0.0010≦B≦0.0050
0.0010≦N≦0.0130
0≦Al≦0.060
0≦Mo≦1.00
0≦Ni≦1.0
0.01≦Ti≦0.07
0≦V≦0.3
0≦P≦0.050
0.01≦S≦0.1
0≦Cu≦0.5
0≦Sn≦0.1
が含まれ、組成の残部が鉄および製造方法から生じる不可避不純物からなり、微細構造が、表面割合で100%から70%のベイナイト、30%未満の残留オーステナイトおよび5%未満のフェライトから構成される、部品。 - 請求項1に記載の部品であって、ニオブ、バナジウム、モリブデン、チタンおよびアルミニウムの含有量が、0.1≦S1≦0.4であり、S1=Nb+V+Mo+Ti+Alである、部品。
- 請求項1または2に記載の部品であって、組成に含有量が質量パーセントで表される0.15≦C≦0.27が含まれる、部品。
- 請求項1から3のいずれか一項に記載の部品であって、組成に含有量が質量パーセントで表される1.7≦Mn≦2.0が含まれる、部品。
- 請求項1から4のいずれか一項に記載の部品であって、組成に含有量が質量パーセントで表される1.0%≦Cr≦1.5が含まれる、部品。
- 請求項1から5のいずれか一項に記載の部品であって、組成に含有量が質量パーセントで表される0.75≦Si≦0.9が含まれる、部品。
- 請求項1から6のいずれか一項に記載の部品であって、組成に含有量が質量パーセントで表される0.065≦Nb≦0.110が含まれる、部品。
- 請求項1から7のいずれか一項に記載の部品であって、組成に含有量が質量パーセントで表される0.0020≦B≦0.0030が含まれる、部品。
- 請求項1から8のいずれか一項に記載の部品であって、組成に含有量が質量パーセントで表される0.0050≦N≦0.0120が含まれる、部品。
- 請求項1から9のいずれか一項に記載の部品であって、組成に含有量が質量パーセントで表される0.003≦Al≦0.015が含まれる、部品。
- 請求項1から10のいずれか一項に記載の部品であって、組成に含有量が質量パーセントで表される0≦Ni≦0.55が含まれる、部品。
- 請求項1から11のいずれか一項に記載の部品であって、組成に含有量が質量パーセントで表される0<V≦0.2が含まれる、部品。
- 請求項1から12のいずれか一項に記載の部品であって、組成に含有量が質量パーセントで表される0.03<Mo≦0.15が含まれる、部品。
- 請求項1から13のいずれか一項に記載の部品であって、前記微細構造が0%のフェライトを含む、部品。
- 鋼鉄部品を製造する方法であって、以下の連続する工程、
−請求項1から13のいずれか一項に記載の組成と微細構造とを有する鋼を、ブルーム、長方形、正方形もしくは円形の断面を有するビレットまたはインゴットの形態で準備する工程、次に
−この鋼を、半製品の形態で、棒またはワイヤの形態で圧延する工程、次に
−前記半製品を、1100℃から1300℃の間の再加熱温度(Trech)にして再加熱した半製品を得る工程、次に
−前記再加熱した半製品を熱間成形して熱間成形部品を得る工程、ここで熱間成形の終了時の温度が850℃以上であり、次に
−前記熱間成形部品を、620℃から580℃の間の温度に達するまで、0.10℃/sから10℃/sの間の冷却速度Vr600で冷却する工程、次に
−前記部品を、420℃から380℃の間の温度まで4℃/s未満の冷却速度Vr400で冷却する工程、次に
−前記部品を、0.3℃/s以下の速度で380℃から300℃の間の温度に冷却する工程、次に
−前記部品を、4℃/s以下の速度で周囲温度まで冷却する工程、次に、
−場合により、前記熱間成形部品を、300℃から450℃の間の焼戻し温度で30分から120分の間の時間にわたって、加熱焼戻し処理し、周囲温度まで冷却する工程、次に
−前記部品の機械加工を行う工程
を含む、方法。 - 請求項15に記載の鋼鉄部品を製造する方法であって、炭素、窒素、クロム、ケイ素、マンガン、硫黄およびニッケルの含有量が、
0.5≦S2≦1.8
0.7≦S3≦1.6
0.3≦S4≦1.5
であり、
S2=C+N+Cr/2+(S1)/6+(Si+Mn−4*S)/10+Ni/20
S3=S2+1/3xVr600
S4=S3−Vr400
であり、
Vr400およびVr600は、℃/sで表され、Vr400が420℃から380℃の間の温度範囲における前記部品の冷却速度を表し、Vr600が620℃から580℃の間の温度範囲における前記部品の冷却速度を表す、鋼鉄部品を製造する方法。
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PCT/IB2015/000384 WO2016151345A1 (fr) | 2015-03-23 | 2015-03-23 | Pieces a structure bainitique a hautes proprietes de resistance et procede de fabrication |
PCT/IB2016/000343 WO2016151390A1 (fr) | 2015-03-23 | 2016-03-23 | Pieces a structure bainitique a hautes proprietes de resistance et procede de fabrication |
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