Journal
STEEL RESEARCH INTERNATIONAL
Volume 86, Issue 12, Pages 1628-1635Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/srin.201400597
Keywords
hot stamping; high-pressure aluminum die casting; thermal diffusivity; thermal conductivity; hot work tool steel
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The knowledge of thermal conductivity is essential for improving and designing tools for hot working applications like hot stamping and high-pressure aluminum die casting. This study investigates the influence of alloying composition and heat treatment on thermal conductivity of two different hot work tool steels in the temperature range between 20 and 500 degrees C. Thermal conductivity was determined with an indirect measurement by using the dynamic method. The thermal conductivity of the two tool steels was found to be dependent on the amount of alloying elements, heat treatment condition, and operating temperature. In the regime of hot stamping applications, i.e for service temperatures below 200 degrees C, thermal conductivity increases with temperature for both steels irrespective of their heat treatment condition. In applications in which tools are subjected to temperatures above 200 degrees C (such as high-pressure die casting operations), thermal conductivity of the steels decreases as tool temperature increases.
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