Evaluation of fatigue limit characteristics of lamellar pearlitic steel in consideration of microstructure

Shigeru Hamada, Yuu Sakoda, Daisuke Sasaki, Masaharu Ueda, Hiroshi Noguchi

研究成果: ジャーナルへの寄稿記事

5 引用 (Scopus)

抄録

In this study, tensile and fatigue tests were performed to evaluate the fatigue limit of lamellar pearlitic steel used for manufacturing railroad rail. The fatigue ratio of lamellar pearlitic steel was lower than that of general steels, the reason for which is unknown. Fatigue cracks initiated in pearlitic steel at a very early stage of the fatigue test. Then, it was speculated that the steel should be treated as that with initial defects. In order to determine the initial defect size in the ultra-low cycle fatigue test, tensile tests were performed. The tensile test results clarified that the crack initiation size depends on the crystal structure. In order to predict the fatigue limit of the pearlitic steel, the prediction method proposed by Murakami was applied to the steel. The measured defect sizes were applied to the prediction method, and fatigue tests were performed. The predicted fatigue limit and the test results were in good agreement. In addition, in order to evaluate the crystal structure at the location of the fatigue crack initiation, electron backscatter diffraction pattern (EBSD) analyses were performed. The analysis results revealed that the crack initiation depends on the pearlite block. Then, we concluded that the fatigue limit of pearlitic steel can be predicted by Murakami's method and the defect size is pearlite block size. Then, decreasing the pearlite block size would cause an improvement in the fatigue limit of the pearlitic steel.

元の言語英語
ページ(範囲)790-795
ページ数6
ジャーナルZairyo/Journal of the Society of Materials Science, Japan
60
発行部数9
DOI
出版物ステータス出版済み - 9 1 2011

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Steel
steels
Fatigue of materials
microstructure
Microstructure
evaluation
fatigue tests
pearlite
crack initiation
Pearlite
tensile tests
Crack initiation
Defects
defects
Crystal structure
rail transportation
crystal structure
rails
predictions
Railroads

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

これを引用

Evaluation of fatigue limit characteristics of lamellar pearlitic steel in consideration of microstructure. / Hamada, Shigeru; Sakoda, Yuu; Sasaki, Daisuke; Ueda, Masaharu; Noguchi, Hiroshi.

:: Zairyo/Journal of the Society of Materials Science, Japan, 巻 60, 番号 9, 01.09.2011, p. 790-795.

研究成果: ジャーナルへの寄稿記事

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