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Fabrication of Fe-Cr-Mo powder metallurgy steel via a mechanical-alloying process

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Abstract

In this study, we employed a mechanical–alloying process to manufacture low-alloy CrL and CrM steel powders that have similar specifications to their water-atomized counterparts. X-ray diffraction showed that Mo and Cr are alloyed in Fe after four cycles of planetary milling for 1 h at 150 RPM with 15-min pauses between the cycles (designated as P2C4 process). Furthermore, the measured powder size was found to be similar to that of the water-atomized counterparts according to both scanning electron microscope images and laser particle size analysis. The samples were sintered at 1120 °C, after which the P2C4-milled CrL showed similar hardness to that of water-atomized CrL, whereas the P2C4-milled CrM showed about 45% lower hardness than that of its water-atomized counterpart. Water-atomized CrM consists of a well-developed lathtype microstructure (bainite or martensite), while a higher fraction of polygonal ferrite is observed in P2C4-milled CrM. This phase difference causes the reduction of hardness in the P2C4-milled CrM, implying that the phase transformation behavior of specimens produced via powder metallurgy is influenced by the powder fabrication method.

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Authors and Affiliations

  1. School of Advanced Materials Engineering, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul, 136-702, Republic of Korea

    Jooyoung Park, Gowoon Jeong & Hyunjoo Choi

  2. Advanced Steel Processing and Products Research Center, Colorado School of Mines, 1500 Illinois Street, Golden, CO, 80401, USA

    Singon Kang

  3. Division of Advanced Materials Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju, Jeonbuk, 561-756, Republic of Korea

    Seok-Jae Lee

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  1. Jooyoung Park
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  2. Gowoon Jeong
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  3. Singon Kang
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  4. Seok-Jae Lee
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  5. Hyunjoo Choi
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Correspondence to Hyunjoo Choi.

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Park, J., Jeong, G., Kang, S. et al. Fabrication of Fe-Cr-Mo powder metallurgy steel via a mechanical-alloying process. Met. Mater. Int. 21, 1031–1037 (2015). https://doi.org/10.1007/s12540-015-5189-9

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  • DOI: https://doi.org/10.1007/s12540-015-5189-9

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