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  • Summary & Details

Study of Strength Characteristics for Welded Part in High-Tensile Steel Sheet

超ハイテン鋼板における溶接部の強度特性の研究

Detailed Information

Category(J)論文

Translation

Category(E)Technical Papers and Explanation
Author(J)1) 鈴木良二, 2) 松目悠里, 3) 高橋兼一, 4) 香取法章
Author(E)1) Ryoji Suzuki, 2) Yuri Matsume, 3) Kenichi Takahashi, 4) Noriaki Katori
Affiliation(J)1) 日野, 2) 日野, 3) 日野, 4) 日野
Affiliation(E)1) Hino, 2) Hino, 3) Hino, 4) Hino
Abstract(J)2050 年カーボンニュートラルを達成するためには電動車の開発が重要であると同時に車両の軽量化が求められており、その手法として超ハイテン鋼板を車両に適用することが考えられる。一方で、超ハイテン鋼板の適用において溶接による疲労限度の低下が懸念され、溶接部の疲労限度向上が課題となっている。本研究では1,500 MPa級焼入れ鋼板、1,180MPa級TRIP鋼板、SPH 590を用いて隅肉溶接部の曲げ疲労試験を実施した結果、TRIP鋼板は1 , 500MPa級焼入れ鋼板およびSPH 5 9 0 に対して1.5倍の疲労限度が得られた。TRIP鋼板の疲労限度が優れた要因としては添加元素の2.0 %マンガンと2.0 %シリコンの働きにより、溶接ビード端の硬さ向上のみならず、引張残留応力の抑制効果もあると推定した。また、溶接ビード端への後処理として、ニードル式ピーニング処理を実施した結果、溶接部の疲労強度が約20% 向上された。

Translation

Abstract(E)In order to achieve the 2050 carbon neutral, it is important to develop BEV and FCEV. In those developments, the application of ultra-high-tensile steel sheet to automobile steel sheet can be considered as a weight reduction method. However, a problem is the suppression of the decrease in the strength of welded part. To improve the problem, it was implemented that a bending fatigue test of the fillet welded part of 1,500 MPa class quenching steel sheet, 1,180 MPa class TRIP steel sheet and SPH590. As a result, TRIP steel sheet was 1.5 times stronger than the quenching steel sheet and SPH590. The reason of TRIP steel sheet had higher strength was inferred that because TRIP steel sheet was included 2.0% manganese and 2.0% silicon, those elements worked not only to improve the hardness of the weld bead end, but also to suppress the tensile residual stress. In addition, as a result of performing needle peening treatment as a post-treatment on the weld bead end, the fatigue strength of the weld was improved by about 20%.

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