Microscopic deformation behavior of lamellar pearlite steel

Yuu Sakoda, Suguru Kashiwagi, Shigeru Hamada, Hiroshi Noguchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Fatigue ratio of lamellar pearlite steel used for railroad rail is lower than the ratio of general steels. The reason is not clarified. It is reported the direction of lamellar microstructure in lamellar pearlite steel effects fatigue characteristics. In order to clarify microscopic deformation behavior of lamellar microstructure considered to effect fatigue characteristics, static tensile tests of lamellar pearlite steel was conducted, in this report. Using the plastic replica technique, microscopic deformation behavior, the initiation and propagation of micro crack was observed. By the observation, it is clarified that the crack initiates but does not propagate during static tensile test. The authors presume the fatigue of lamellar pearlite steel as follow: The grain size crack initiate at initial stage of fatigue process, and the crack act as initial defect of the lamellar pearlite steel. Based on the presumption, the fatigue limit of the lamellar pearlite steel was predicted, and the fatigue limit was confirmed by fatigue tests. As the result, the predicted fatigue ratio are 0.32~0.33 which show good agreement with the fatigue test result.

Original languageEnglish
Title of host publication17th European Conference on Fracture 2008
Subtitle of host publicationMultilevel Approach to Fracture of Materials, Components and Structures
Pages358-365
Number of pages8
Publication statusPublished - Dec 1 2008
Event17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, ECF17 - Brno, Czech Republic
Duration: Sep 2 2008Sep 5 2008

Publication series

Name17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures
Volume1

Other

Other17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, ECF17
CountryCzech Republic
CityBrno
Period9/2/089/5/08

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering

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  • Cite this

    Sakoda, Y., Kashiwagi, S., Hamada, S., & Noguchi, H. (2008). Microscopic deformation behavior of lamellar pearlite steel. In 17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures (pp. 358-365). (17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures; Vol. 1).