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Rapid Thermal Processing to Enhance Steel Toughness.

V K Judge1, J G Speer1, K D Clarke1

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Short-time, rapid tempering overcomes tempered martensite embrittlement (TME) in steel, achieving superior strength and toughness combinations. This novel approach enhances mechanical properties beyond conventional quenching and tempering (Q&T) methods.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Mechanical Engineering

Background:

  • Quenching and Tempering (Q&T) is a standard heat treatment for enhancing steel properties.
  • Tempered Martensite Embrittlement (TME) is a known limitation in conventional Q&T, reducing toughness at high strength levels.

Purpose of the Study:

  • To investigate the effects of short-time, rapid tempering on steel mechanical properties.
  • To demonstrate the potential for overcoming TME and achieving novel property combinations.

Main Methods:

  • Utilized short-time, rapid tempering processes.
  • Characterized mechanical properties including strength and toughness.
  • Evaluated the limitations of the traditional tempering parameter (TP).

Main Results:

  • Achieved over 43% toughness enhancement at 1.7 GPa strength.
  • Increased strength by over 0.5 GPa at 30 J impact toughness.
  • Demonstrated that the traditional tempering parameter (TP) is insufficient for rapid tempering characterization.

Conclusions:

  • Short-time, rapid tempering offers a pathway to unprecedented steel property combinations by mitigating TME.
  • Novel Q&T steels processed via rapid tempering hold promise for energy, defense, and transportation sectors.
  • Energy-efficient manufacturing processes like induction heating are key enablers for rapid tempering.