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Volume 39 Issue 4
Aug.  2021
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QIU Yue, LIN Yao-jun, ZHANG Qin-yi, CHEN Fei, ZHANG Yue-xiang. Study on tool steels with ultrahigh carbon and ultrahigh chromium prepared by vacuum hot-pressing[J]. Powder Metallurgy Technology, 2021, 39(4): 297-303. DOI: 10.19591/j.cnki.cn11-1974/tf.2019110007
Citation: QIU Yue, LIN Yao-jun, ZHANG Qin-yi, CHEN Fei, ZHANG Yue-xiang. Study on tool steels with ultrahigh carbon and ultrahigh chromium prepared by vacuum hot-pressing[J]. Powder Metallurgy Technology, 2021, 39(4): 297-303. DOI: 10.19591/j.cnki.cn11-1974/tf.2019110007
shu

Study on tool steels with ultrahigh carbon and ultrahigh chromium prepared by vacuum hot-pressing

  • 1.

    School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

  • 2.

    Beijing Huiyue New Material Technology Co. Ltd., Beijing 102206, China

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  • Corresponding author:

    LIN Yao-jun, E-mail: yjlin@whut.edu.cn

  • Received Date: November 06, 2019
  • Available Online: March 30, 2021
    Graphical Abstract
    • Abstract
  • Tool steels with the ultrahigh C and Cr (2.6% C and 26% Cr, mass fraction) were produced by the vacuum hot-pressing (VHP) in this study. Based on the differential scanning calorimetry analysis, two VHP temperatures (1100 ℃ and 1150 ℃) are selected which are much lower than the melting point. The bulk steels with the density of 7.45~7.47 g∙cm−3 are obtained by VHP at 1100 ℃ and 1150 ℃, respectively, exhibiting the full densification and good metallurgical bonding between powders. The average carbide sizes in the bulk steels obtained by VHP at 1100 ℃ and 1150 ℃ are 3.5 μm and 5.5 μm, and the maximum carbide sizes are 6.0 μm and 8.5 μm, respectively. After quenching at 1150 ℃ and tempering at 500 ℃, the average hardness values of the bulk steels obtained by VHP at 1100 ℃ and 1150 ℃ are approximately HRC 62.6 and HRC 60.8, and the average three-point bending strengths are 2060 MPa and 1850 MPa, respectively. After quenching at 1150 ℃ and tempering at 550 ℃, the average hardness values of the bulk steels obtained by VHP at 1100 ℃ and 1150 ℃ are approximately HRC 55.2 and HRC 53.6, and the average three-point bending strengths are 2490 MPa and 2320 MPa, respectively. At the same quenching and tempering conditions, the higher three-point bending strengths of the bulk steels obtained by VHP at 1100 ℃ can be attributed to the smaller carbide sizes.
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