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http://dx.doi.org/10.12656/jksht.2011.24.5.262

Carbide Behavior in STD11 Tool Steel during Heat Treatment  

Hong, Ki-Jung (Analysis & Assessment Center, RIST)
Song, Jin-Hwa (POSCO Technical Research Laboratories, POSCO)
Chung, In-Sang (School of Materials Science and Engineering, Kyungpook National University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.24, no.5, 2011 , pp. 262-270 More about this Journal
Abstract
Carbide precipitation and dissolution behavior at various temperatures during heat treatment has been studied in STD11 cold working die steel through confocal scanning laser microscopy; dilatometry; and X-ray diffraction analysis. The equilibrium phase diagram and phase fractions with temperature were calculated using a FactSage program. Confocal laser microscopic observation revealed that ${\alpha}$ to ${\gamma}$ transformation temperature is near $800^{\circ}C$; M7C3 carbides melt at $1245^{\circ}C$; and the melting temperature of STD11 is near $1370^{\circ}C$. XRD results indicated that the M23C6 carbides dissolve in the matrix if austenitized at over $1030^{\circ}C$; while the M7C3 carbides remain up to $1200^{\circ}C$ although their amount decreases. The calculated equilibrium phase diagram showed good agreement with experimental results on carbide dissolution and phase transformation temperatures.
Keywords
STD11; Tool steel; Heat treatment; Carbides; Confocal laser microscope;
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Times Cited By KSCI : 2  (Citation Analysis)
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