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Fatigue Characteristics of Nano-Structured Tool Steel Under Load Variation by Ultrasonic Cold Forging Treatment

  • Chang-Min Suh
  • Gil-Ho Song
  • Min-Ho Kim
  • Young-Shik Pyoim
Conference paper

Abstract

Recently, the use of high strength steels (HSS) for automotive applications has been drastically increased not only to enhance the safety and durability of vehicles, but also lighten the weight for a high degree of fuel efficiency, In the side trimming operation in the production of HSS and mild steel, knife breakage and burr frequently occur. In addition, such breakage and bad quality of strip cutting face are affected by yield as well as by reduced productivity and reliability on production line [1–5]. This study examined the variation of mechanical properties of nano-structured surface by ultrasonic cold forged tool steel (SKD-61). Same ultrasonic cold forging treatment (UCFT) process was applied to produce the trimming knife. Their effectiveness and reliability of the UCFT were successfully verified through the field test by trimming process in cold rolling line of POSCO.

Keywords

High Strength Steel Severe Plastic Deformation Fatigue Limit Ultrasonic Vibration Compressive Residual Stress 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    Hwang, S. Y, 2000, “Improvement of Mechanical Properties of Knife for Tandem Cold Rolling”, RIST reportGoogle Scholar
  2. 2.
    Pyoun, Y. S, Han, C. H and Azuma, N, 2001, “Development of an Automated Super Surface Finishing System for the 3D Sculptured Surface of Model and Dies using Ultrasonic Micro Burnishing Technology”, Processing of the 32nd ISRGoogle Scholar

Copyright information

© Springer 2007

Authors and Affiliations

  • Chang-Min Suh
    • 1
  • Gil-Ho Song
    • 2
  • Min-Ho Kim
    • 1
  • Young-Shik Pyoim
    • 3
  1. 1.School of Mechanical EngineeringKyungpook National UniversityBukgu, DaeguKorea
  2. 2.Technical Research CenterPOSCOKorea
  3. 3.Dept. of Mechanical and Control EngineeringSunMoon UniversityKorea

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