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Effect of microstructure parameters on tensile toughness of tool steel after deep cryogenic treatment

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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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Authors and Affiliations

  1. Department of Materials Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

    Seyed Ebrahim Vahdat, Said Nategh & Shamsoddin Mirdamadi

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  1. Seyed Ebrahim Vahdat
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  2. Said Nategh
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  3. Shamsoddin Mirdamadi
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Correspondence to Seyed Ebrahim Vahdat.

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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

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