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  • Summary & Details

Effect of Load Mode on Fatigue Strength of 1180MPa Class Recycled Steel

1180MPa級のリサイクル鋼板の疲労強度に及ぼす荷重様式の影響

Detailed Information

Category(J)研究論文

Translation

Category(E)ResearchPaper
Author(J)1) 長島 伸夫, 2) 早川 正夫, 3) 長井 寿, 4) 升田 博之, 5) 中西 栄三郎, 6) 中西 宣文, 7) 岩崎 勝
Author(E)1) Nagashima Nobuo, 2) Hayakawa Masao, 3) Nagai Kotobu, 4) Masuda Hiroyuki, 5) Nakanishi Eizaburo, 6) Nakanisi Noriyuki, 7) Iwasaki Masaru
Affiliation(J)1) 物質・材料研究機構, 2) 物質・材料研究機構, 3) 物質・材料研究機構, 4) 物質・材料研究機構, 5) 東京製鐵, 6) 東京製鐵, 7) 東京製鐵
Abstract(J)老廃スクラップから創製した1180MPa級リサイクル鋼板について引張試験ならびに穴広げ試験を実施し,さらに部品要求性能として重要な疲労強度特性を把握するため荷重方式の異なる疲労試験を実施した.これらの結果から,スクラップから創製したリサイクル鋼板の自動車用鋼板としての適応性について検討する.

Translation

Abstract(E)The present study investigated the material properties of 1180MPa class recycled steel fabricated from waste scraps to evaluate the required performance of parts as steel sheets for automobiles. The recycled steel showed a strength-ductility performance comparable or better than that of 980 MPa class steel.: tensile strength of 1234 MPa, total elongation of 18%, stretch-flangeabilty λ of 21%, limiting dome height of 12.2 mm, and limiting drawing ratio of 2.09%. In the fatigue test with a stress ratio R = -1, the mirror finish material had a fatigue limit of 600 MPa at 107cycles to failure for both bending load and axial load. The fatigue limit corresponds to half tensile strength that is believed to be the maximum fatigue limit in cases of surface initiation of fatigue. Actually, all fatigue fractures originated from the specimen surface, and no internal initiation from inclusions were observed. The fatigue limits obtained by changing the stress ratio under bending load well matched the corrected goodman line. Therefore, the effect of average stress can be reliably evaluated from the fatigue limit diagram. In this way, the 1180MPa class recycled steel sheet has high fatigue strength with sufficient reliability and satisfactory meets the required performance of parts as a steel sheet for automobiles

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