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Microstructure and Mechanical Properties of B4C-Blended M3:2 High-Speed Steel Powders Consolidated by Sintering and Heat Treatment

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Abstract

Water-atomized powders of M3:2 high-speed steel (HSS) were blended with B4C and consolidated by cold press sintering. With the addition of B4C (~ 0.2 vol.%), satisfactory mechanical properties were achieved for HSS by sintering at a temperature as low as 1190 °C [e.g., 53.2 ± 0.2 in the Rockwell hardness (HRC) and 3074 ± 56 MPa in bending strength]. High relative density (98.5%) and good strength were attributed to the mechanism described as follows: First, the atoms of boron and carbon escaped after the reaction between B4C and iron matrix. Then, the sintered HSS was strengthened by boron atoms while they were distributed in M6C or MC carbides and iron matrix. Second, a plenty of M6C carbides were formed due to the release of carbon atoms. As a result, the value of solidus temperature was reduced. In addition, mechanical properties were greatly improved by heat treatment (quenching and tempering) (e.g., 61.2 ± 0.3 in HRC, 4356 ± 64 MPa in bending strength, and 42.3 ± 0.5 MPa m1/2 in fracture toughness, respectively).

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Acknowledgments

This work was supported by the National High Technology Research and Development Program of China (863 Program) under the grant number 2013AA031102. One of the authors (PL) gratefully acknowledges the financial support from Shanghai Collaborative Innovation Centre for Heavy Casting/Forging Manufacturing Technology and the Practice Scheme via Industry-University-Research Cooperation for Shanghai Higher Education Teachers, as sponsored by Shanghai Municipal Education Commission.

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Authors and Affiliations

  1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, People’s Republic of China

    Fengli Zhang, Qi Ouyang, Qinqiu He, Ming Hu & Songlin Li

  2. Shanghai Collaborative Innovation Center for Heavy Casting/Forging Manufacturing Technology, School of Materials, Shanghai Dianji University, Shanghai, 201306, People’s Republic of China

    Peng Luo

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  1. Fengli Zhang
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Correspondence to Songlin Li.

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Zhang, F., Luo, P., Ouyang, Q. et al. Microstructure and Mechanical Properties of B4C-Blended M3:2 High-Speed Steel Powders Consolidated by Sintering and Heat Treatment. J. of Materi Eng and Perform 28, 6145–6156 (2019). https://doi.org/10.1007/s11665-019-04347-x

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