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Microstructure and Properties of Cast B-Bearing High Speed Steel

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Abstract

Microstructure, mechanical properties, and wear resistance of B-bearing high-speed steel (HSS) roll material containing 0.90-1.00% C, 1.3-1.5% B, 0.8-1.5% W, 0.8-1.5% Mo, 4.6-5.0% Cr, 1.0-1.2% V, and 0.15-0.20% Ti were studied by means of the optical microscopy (OM), the scanning electron microscopy (SEM), x-ray diffraction (XRD), hardness, impact toughness, and pin-on-disk abrasion tests. The results showed that as-cast structure of B-bearing HSS consisted of α-Fe-, M23(B,C)6-, M3(B0.7C0.3)-, and M2(B,C)-type borocarbides, a small quantity of retained austenite, and a small amount of TiC. The hardness and impact toughness values of as-cast B-bearing HSS reached 65-67 HRC and 80-85 kJ/cm2, respectively. There were many M23(B,C)6-precipitated phases in the matrix after tempering, and then, with increasing temperature, the amount of precipitated phases increased considerably. Hardness of B-bearing HSS gradually decreased with the increasing tempering temperature, and the change of tempering temperature had no obvious effect on impact toughness. B-bearing HSS tempered at 500 °C has excellent wear resistance, which can be attributed to the effect of boron.

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Acknowledgments

The authors would like to acknowledge the financial support for this study from the National Natural Science Foundation of China under grant (51274016) and the Scientific Plan Item of Beijing Education Committee under grant (PXM2012-136, PXM2012-156).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beijing University of Technology, Number 100, Pingle Garden, Chaoyang District, Beijing, 100124, People’s Republic of China

    Hanguang Fu, Jianqiang Hou & Yongping Lei

  2. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an, 710049, Shaanxi Province, People’s Republic of China

    Shengqiang Ma & Jiandong Xing

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Correspondence to Hanguang Fu.

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Fu, H., Ma, S., Hou, J. et al. Microstructure and Properties of Cast B-Bearing High Speed Steel. J. of Materi Eng and Perform 22, 1194–1200 (2013). https://doi.org/10.1007/s11665-012-0378-x

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  • DOI: https://doi.org/10.1007/s11665-012-0378-x

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