Delayed Fracture Properties of 1500 MP a Bainite/Martensite Dual-phase High Strength Steel and Its Hydrogen Traps
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概要
- 論文の詳細を見る
It is very imperative to improve delayed fracture properties of high strength steel, which may enlarge its usage. The published literature shows that the susceptibility to hydrogen embrittlement of a novel 1 500 MPa bainite/martensite dual-phase high strength steel is inferior to that of conventional quench-tempered high strength steel. The stress corrosion cracking (SCC) in a 3.5% NaCl solution for novel 1 500 MPa bainite/ martensite dual-phase high strength steel was investigated in this paper by using modified wedge-opening-loading (WOL) specimens. The experimental results show that KISCC for novel 1 500 MPa bainite/martensite dual-phase high strength steel is larger than 50 MPa·m1/2, exceeding conventional high strength steel. Its crack growth rate (da/dt)II is about 1×10−5 mm/s, which is less than that of conventional high strength steel. Hydrogen trapping phenomena in the steel were investigated by electrochemical permeation technique. The lath boundaries and stable retained austenite are beneficial hydrogen trap, slowing down the segregation of hydrogen on the crack tip, hence KISCC increases and crack growth rate decreases.
- 社団法人 日本鉄鋼協会の論文
- 2002-12-15
著者
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Chang K.
Department Of Aerospace Engineering Korea Advanced Institute Of Science And Technology
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Fang H.
Department Of Materials Science And Engineering Laboratory Of Advanced Materials Materials Research
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GU J.
Department of Materials Science and Engineering, Laboratory of Advanced Materials, Materials Researc
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BAI B.
Department of Materials Science and Engineering, Laboratory of Advanced Materials, Materials Researc
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Bai B.
Department Of Materials Science And Engineering Laboratory Of Advanced Materials Materials Research
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