Experimental investigation of the effect of surface markings on the mechanical integrity of weathering bridge steels.
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Experimental investigation of the effect of surface markings on the mechanical integrity of weathering bridge steels.

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  • Creators:
  • Corporate Creators:
    University of Florida
  • Subject/TRT Terms:
  • Publication/ Report Number:
    BDV31-977-02
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    United States
  • Corporate Publisher:
    Florida. Dept. of Transportation
  • Abstract:
    High-strength low-alloy (HSLA) weathering steels are the conventional material used for non-redundant fracture-critical members in bridge construction. Guidelines have been put in place by state

    Departments of Transportation (DOTs) to prevent material suppliers from making scribe marks that

    will remain on the surface of fracture-critical members when in service, due to the possibility of

    degrading mechanical properties. Currently, any automated scribing marks allowed, namely

    mechanical milling, are either cut off of the member or subsequently welded over, thereby effectively

    removing them prior to service. All other markings are either manually die-stamped or spray-painted

    on. The lack of an automated capability to place markings on weathering steels slows production, and

    markings are often accidentally removed during sand blasting or shipping, which causes additional

    problems for the manufacturer and recipient. There is a need to establish safe, automated methods of

    scribing fracture-critical members such that markings will remain throughout the production process,

    but will not compromise the integrity over the lifetime of the part. Three automated techniques were of

    interest in this study as they are often already in the manufacturing process. These include mechanical

    milling, plasma scribing, and laser scribing. In this study, a microstructural evaluation of 50W

    weathering steel was conducted to understand and characterize the effect of the three markings on

    microstructural evolution and mechanical properties. Plasma scribing resulted in the most noticeable

    surface marking. S-N curves generated through fatigue testing showed no measurable difference in

    fatigue life between marked and unmarked material.

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