JP2022513667A - 遅れ破壊に高い耐性を有するプレス硬化部品及びその製造方法 - Google Patents
遅れ破壊に高い耐性を有するプレス硬化部品及びその製造方法 Download PDFInfo
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- JP2022513667A JP2022513667A JP2021530874A JP2021530874A JP2022513667A JP 2022513667 A JP2022513667 A JP 2022513667A JP 2021530874 A JP2021530874 A JP 2021530874A JP 2021530874 A JP2021530874 A JP 2021530874A JP 2022513667 A JP2022513667 A JP 2022513667A
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Abstract
Description
- 顕著なマルテンサイト微細構造、
- 十分なレベルの加えられた応力又は残留応力の存在、
- 十分な量の拡散性水素。この元素は、ホットスタンピング及びプレス硬化の工程の前にブランクの炉内での加熱中に導入され得る。すなわち、炉内に存在する水蒸気が解離して、ブランク表面に吸着され得る。これは、炉雰囲気中の水蒸気がAlプレコートと反応するため、プレコートしたアルミニウムメッキされた鋼ブランクを加熱した場合に特に当てはまり、高温でのこの元素の高い溶解度のために鋼基材中に拡散する水素を発生させる。しかし、プレス硬化部品を室温まで冷却すると、Alコートがバリアとして働くため、水素がその部分から流出するのをほとんど妨げている。このように、上記の条件が同時に満たされれば、最終的に遅延亀裂が生じる可能性がある。
- (C1): 面積単位当たりのMgO及びMgO-Al2O3粒子の数の合計N(MgO+MgO-Al2O3)は1mm2当たり90より高い、
- (C2):面積単位当たりのMgO-TixOy粒子の数N(MgO-TixOy)は1mm2当たり100より高く、その平均サイズは1μmより小さい。
- 0.16%≦C≦0.42%、0.1%≦Mn≦3%、0.07%≦Si≦1.60%、0.002%≦Al≦0.070%、0.02%≦Cr≦1.0%、0.0005%≦B≦0.005%、0.002%≦Ti≦0.11%、0.001%≦O≦0.008%、ここで(Ti)×(O)2×107≦2、0.001%≦N≦0.007%、及び任意に、0.005%≦Ni≦0.23%、0.005%≦Nb≦0.060%、0.001%≦S≦0.005%、0.001%≦P≦0.025%を含み、残余はFe及び不可避の不純物である溶鋼を提供する工程、次いで
- 前述したような化学組成を有する溶鋼を得るためにMg又はMg合金を添加する工程であって、温度TadditionはTliquidus~(Tliquidus+70℃)の間に含まれる工程、次いで
- 半製品の形態に該溶鋼を鋳造する工程であって、Mg又はMg合金を加えてから、溶鋼の凝固開始までに経過する持続時間tDが30分未満である工程、次いで
- 該半製品を1250~1300℃の間に含まれる温度で加熱し、加熱した半製品を得る工程、次いで
- 該半製品を圧延して、圧延鋼板を得る工程、次いで
- 該圧延鋼板をアルミニウム又はアルミニウムベースの合金、又はアルミニウム合金でプレコートし、プレコート鋼板を得る工程、次いで
- 該プレコート鋼板を切断して、プレコート鋼ブランクを得る工程、次いで
- 該プレコート鋼ブランクを加熱して、完全なオーステナイト組織を有する加熱ブランクを得る工程、次いで
- 該加熱ブランクをホットプレス成形して、ホットプレス成形部品を得る工程、次いで
- プレス工具内で維持しながらホットプレス成形部品を冷却して、少なくとも95%のマルテンサイトを含む微細組織を有するプレス硬化被覆鋼部品を得る工程。
- 酸化物、炭窒化物、硫化物及び酸硫化物の平均サイズは1.7μm未満である。粒子の平均サイズdavの特徴は、走査型電子顕微鏡で研磨した試験片を観察することによって測定される。統計学的に代表的なデータを得るためには、少なくとも2000個の粒子を検討する。いったん1個の粒子の存在が特定されると、その性質は粒子全体の走査によるエネルギー分散分光法によって決定される。各粒子(i)の最大サイズ(dmax(i))及び最小サイズ(dmin(i))は画像解析によって決定され、次いで各粒子の平均サイズdav(i)は、((dmax(i))+(dmin(i))/2によって計算され、その後、davは、性質(酸化物、炭窒化物、硫化物又は酸硫化物)に関係なく、(i)粒子に対するdav(i)の平均値として得られる。
- 理論によって拘束されるつもりはないが、粒子のより高い(表面/体積)比は、ベイナイト及び/又はフェライト形成の強化、及び/又はマルテンサイト微細化をもたらすため、1.7μm未満の粒子の平均サイズは、遅れ破壊耐性を高めると考えられる。さらに、1.7μm未満にdavを限定することは、外部応力下での破壊開始のリスク低下に寄与する。
- (C1): 面積単位当たりのMgO及びMgO-Al2O3粒子の合計N(MgO+MgO-Al2O3)が、1mm2当たり90より高い、
- (C2): 面積単位当たりのMgO-TixOy粒子の数N(MgO-TixOy)が、1mm2当たり100より高く、その平均サイズは1μmよりも小さい。
Claims (19)
- 遅れ破壊に対して高い耐性を有するプレス硬化被覆鋼部品であって、被膜はプレコートのアルミニウム又はアルミニウムベースの合金又はアルミニウム合金への鉄の拡散から生じる(Fex-Aly)金属間化合物を含み、
該鋼の化学組成は重量で、
0.16%≦C≦0.42%
0.1%≦Mn≦3%
0.07%≦Si≦1.60%
0.002%≦Al≦0.070%
0.02%≦Cr≦1.0%
0.0005≦B≦0.005%
0.002%≦Mg≦0.007%
0.002%≦Ti≦0.11%
0.0008%≦O≦0.005%
ここで(Ti)×(O)2×107≦2
0.001%≦N≦0.007%
0.001%≦S≦0.005%
0.001%≦P≦0.025%
及び任意に以下のリストから選択される1種以上の元素を含み、
0.005%≦Ni≦0.23%
0.005%≦Nb≦0.060%
残余はFe及び不可避的不純物であり、
微細組織は少なくとも95%のマルテンサイトを含む、プレス硬化被覆鋼部品。 - 0.18%≦C≦0.35%である、請求項1に記載のプレス硬化被覆鋼。
- 0.55%≦Mn≦1.40%である、請求項1又は2に記載のプレス硬化被覆鋼。
- Si≦0.30%である、請求項1~3のいずれか一項に記載のプレス硬化被覆鋼。
- 酸化物、炭窒化物、硫化物及び酸硫化物の平均サイズdavが1.7μm未満であり、以下の条件(C1)又は(C2)の少なくとも1つが満たされる、請求項1~4のいずれか一項に記載のプレス硬化被覆鋼。
-(C1): 面積単位当たりのMgO及びMgO-Al2O3粒子の数の合計N(MgO+MgO-Al2O3)は、1mm2当たり90より大きく、
-(C2): 面積単位当たりのMgO-TixOy粒子の数N(MgO-TixOy)は、1mm2当たり100より高く、その平均サイズは1μmより低い。 - 該微細組織がベイナイト及び/又はフェライトを含む、請求項1~5のいずれか一項に記載のプレス硬化被覆鋼部品。
- その厚さが0.8~4mmの間に含まれる、請求項1~6のいずれか一項に記載のプレス硬化被覆鋼部品。
- その引張強さが1400~2000MPaの間に含まれる、請求項1~7のいずれか一項に記載のプレス硬化被覆鋼部品。
- その降伏応力が1000MPaより高い、請求項1~8のいずれか一項に記載のプレス硬化被覆鋼部品。
- 以下の連続する工程を含む、遅れ破壊に対して高い耐性を有するプレス硬化被覆鋼部品を製造するための方法。
- 0.16%≦C≦0.42%、0.1%≦Mn≦3%、0.07%≦Si≦1.60%、0.002%≦Al≦0.070%、0.02%≦Cr≦1.0%、0.0005%≦B≦0.005%、0.002%≦Ti≦0.11%、0.001%≦O≦0.008%、ここで(Ti)×(O)2×107≦2、0.001%≦N≦0.007%、及び任意に、0.005%≦Ni≦0.23%、0.005%≦Nb≦0.060%、0.001%≦S≦0.005%、0.001%≦P≦0.025%を含み、残余はFe及び不可避の不純物である溶鋼を提供する工程、次いで
- 請求項1~4のいずれか一項に記載の化学組成を有する溶鋼を得るためにMg又はMg合金を添加する工程であって、温度TadditionはTliquidus~(Tliquidus+70℃)の間に含まれる工程、次いで
- 半製品の形態に該溶鋼を鋳造する工程であって、Mg又はMg合金を加えてから溶鋼の凝固開始までの間に経過する持続時間tDが30分未満である工程、次いで
- 該半製品を1250~1300℃の間に含まれる温度に加熱して、加熱した半製品を得る工程、次いで
- 該半製品を圧延して、圧延鋼板を得る工程、次いで
- 該圧延鋼板をアルミニウム又はアルミニウムベースの合金又はアルミニウム合金でプレコートし、プレコート鋼板を得る工程、次いで
- 該プレコート鋼板を切断して、プレコート鋼ブランクを得る工程、次いで
- 該プレコート鋼ブランクを加熱して、完全なオーステナイト組織を有する加熱ブランクを得る工程、次いで
- 該加熱ブランクをホットプレス成形して、ホットプレス成形部品を得る工程、次いで
- プレス工具内で維持しながら該ホットプレス成形部品を冷却して、少なくとも95%のマルテンサイトを含む微細組織を有するプレス硬化被覆鋼部品を得る工程。 - 該持続時間tDが1分未満である、請求項10に記載のプレス硬化被覆鋼部品を製造する方法。
- 該持続時間tDが10秒未満である、請求項10に記載のプレス硬化被覆鋼部品を製造する方法。
- 該半製品の表面における冷却速度Vsが30℃/秒より高い、請求項10~12のいずれか一項に記載のプレス硬化被覆鋼部品を製造する方法。
- 該加熱が、890~950℃の間に含まれる温度θmまで1~10分間の間に含まれる総滞留時間tmの間行われる、請求項10~13のいずれか1項に記載のプレス硬化被覆鋼部品を製造する方法。
- 該プレコート鋼ブランクの加熱が、+10~+25℃の間に含まれる露点を有する雰囲気の炉内で行われる、請求項10~14のいずれか一項に記載のプレス硬化被覆鋼部品を製造する方法。
- 該プレコート鋼板の厚さが0.8~4mmの間に含まれる、請求項10~15のいずれか一項に記載のプレス硬化被覆鋼部品を製造する方法。
- 該プレス硬化被覆鋼部品の引張強さが、1400~2000MPaの間に含まれる、請求項10~16のいずれか一項に記載のプレス硬化被覆鋼部品を製造する方法。
- 該プレス硬化被覆鋼部品の降伏応力が、1000MPaより高い、請求項10~17のいずれか一項に記載のプレス硬化被覆鋼部品を製造する方法。
- 請求項1~9のいずれか一項に記載のプレス硬化部品、又は請求項10~18のいずれか一項により製造されたプレス硬化部品の、自動車車両の構造部品又は安全部品の製造のための使用。
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CA3114861A1 (en) | 2020-06-25 |
EP3899066A1 (en) | 2021-10-27 |
US11725255B2 (en) | 2023-08-15 |
HUE063767T2 (hu) | 2024-01-28 |
ZA202102204B (en) | 2022-02-23 |
UA127773C2 (uk) | 2023-12-27 |
US20220025480A1 (en) | 2022-01-27 |
KR102538733B1 (ko) | 2023-05-31 |
EP3899066B1 (en) | 2023-10-04 |
KR20210072069A (ko) | 2021-06-16 |
BR112021006244B1 (pt) | 2023-04-04 |
JP7137015B2 (ja) | 2022-09-13 |
CA3114861C (en) | 2023-06-27 |
MA54486B1 (fr) | 2023-11-30 |
BR112021006244A2 (pt) | 2021-07-06 |
CN112955572B (zh) | 2023-02-17 |
PL3899066T3 (pl) | 2024-02-12 |
ES2967098T3 (es) | 2024-04-26 |
MX2021007216A (es) | 2021-07-15 |
CN112955572A (zh) | 2021-06-11 |
WO2020128571A1 (en) | 2020-06-25 |
FI3899066T3 (fi) | 2023-12-04 |
MA54486A (fr) | 2022-03-30 |
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