Abstract
Microstructure of an alloy has a significant effect on mechanical properties. Deep cryogenic treatment extends life of tool steels because of microstructure changes. In this research, effects of microstructural parameters were studied on tensile toughness of a medium carbon-low alloy tool steel. The results showed that the maximum population density of sub-micron sized secondary carbide was obtained after 36 h of soaking time. Also, amount of secondary carbides increased with soaking or tempering times from 2.18 vol% to 12.87 vol%. In addition, high population density and high content of secondary carbides were responsible for tensile toughness enhancement. Therefore, the best results (12–35% improvement in tensile toughness) were obtained for a specimen, which underwent a full treatment cycle consisting of heating, water quenching, soaking at −196°C for 36 or 48 h and tempering at 200°C for 1 or 2 h, respectively.
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Abbreviations
- DCT:
-
Deep Cryogenic Treatment
- PC:
-
Primary Carbide
- PD:
-
Population Density
- SC:
-
Secondary Carbide
- SEM:
-
Scanning Electron Microscope
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Vahdat, S.E., Nategh, S. & Mirdamadi, S. Effect of microstructure parameters on tensile toughness of tool steel after deep cryogenic treatment. Int. J. Precis. Eng. Manuf. 15, 497–502 (2014). https://doi.org/10.1007/s12541-014-0363-4
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DOI: https://doi.org/10.1007/s12541-014-0363-4