Hardness of H13 Tool Steel After Non-isothermal Tempering

  • E. Nelson
  • A. Kohli
  • D. R. Poirier


A direct method to calculate the tempering response of a tool steel (H13) that exhibits secondary hardening is presented. Based on the traditional method of presenting tempering response in terms of isothermal tempering, we show that the tempering response for a steel undergoing a non-isothermal tempering schedule can be predicted. Experiments comprised (1) isothermal tempering, (2) non-isothermal tempering pertaining to a relatively slow heating to process-temperature and (3) fast-heating cycles that are relevant to tempering by induction heating. After establishing the tempering response of the steel under simple isothermal conditions, the tempering response can be applied to non-isothermal tempering by using a numerical method to calculate the tempering parameter. Calculated results are verified by the experiments.


non-isothermal tempering secondary hardening tool steel 



One of the authors (EN) appreciates the encouragement in the form of an award tendered to him by the Phoenix Chapter of ASM International during a student competition when he was yet an undergraduate student. The award was for his presentation on non-isothermal tempering of steel.


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Copyright information

© ASM International 2018

Authors and Affiliations

  1. 1.Spartan Armor SystemsTucsonUSA
  2. 2.Department of Materials Science and EngineeringThe University of ArizonaTucsonUSA
  3. 3.VancouverCanada

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