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ONLINE ISSN: 1883-2954
PRINT ISSN: 0021-1575

Tetsu-to-Hagané Advance Publication

  • Evaluation Method for Small Fatigue Crack Growth Life of Low Carbon Steel with Fine Grain HAZ Microstructure Simulated with Heat Treatment

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    DOI:10.2355/tetsutohagane.TETSU-2019-072

    Small fatigue crack growth tests utilizing DIC technique are carried out for low carbon steel with two different heat treatment to establish the small fatigue crack growth evaluation method. As a result, small fatigue crack growth rate (FCGR) looked larger than that of large crack by evaluating with usual stress intensity factor range. The small fatigue crack opening stress, successfully measured by using DIC technique, were decreasing with loading stress was increasing. In addition, by using effective cyclic J integral range calculated with measured crack opening stress, even small fatigue crack growth rates were almost agreed with that of large crack data. Due to this evaluation, microstructural resistance, appeared in the region of crack length is 0.2 mm or less, is successfully visualized. Finally, estimated small fatigue crack growth life by using Paris’s law of large crack, effective cyclic J integral range and conventional approximation formula of crack opening stress was almost agreed with corresponding experimental data.
  • Determination of Facet Plane and Cleavage Fracture Plane of the Top Dross Formed in a Molten Zinc

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    DOI:10.2355/tetsutohagane.TETSU-2019-067

    In a molten zinc bath of a continuous galvanizing line, top dross particles crystallize as Fe2Al5 intermetallic compound containing Zn. These particles easily adhere to the steel sheets causing surface defects. Therefore, controlling the top dross particles is a key issue. The present study focused on the determination of facet plane of top dross using three-dimensional analysis of morphology of the top dross by simultaneous exploitation of the serial sectioning process and electron back scattering diffraction (EBSD). Furthermore, the crystallographic plane of the cleavage fracture surface of the top dross was determined by EBSD, after cleavage crack was introduced by Vickers hardness indentation. The following results were obtained: (1) The facet planes of the top dross consist of two planes of (001), four planes of {110} and eight planes of {111}. In addition, the top dross particles grow fastest in the [001] direction. Consequently, the top dross particle is concluded to have the polyhedron structure with 14 facet planes. (2) The cleavage fracture surface of the main crack in the top dross is (100) plane.

Article Access Ranking

19 Nov. (Last 30 Days)

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19 Nov. (Last 30 Days)

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