"Enhanced hardness-toughness balance induced by adaptive adjustment of " by Mingjuan Zhao, Xiang Jiang et al.
 

Document Type

Journal Article

Publication Title

Materials

Volume

16

Issue

12

Publisher

MDPI

School

School of Engineering

RAS ID

60213

Funders

National Natural Science Foundation of China / Natural Science Foundation of Jiangxi Province / Natural Science Foundation of Jiangxi Province Education Department

Comments

Zhao, M., Jiang, X,. Guan, Y., Yang, H., Zhao, L., Liu, D., . . . Zhang, L. C. (2023). Enhanced hardness-toughness balance induced by adaptive adjustment of the matrix microstructure in in situ composites. Materials, 16(12), article 4437. https://doi.org/10.3390/ma16124437

Abstract

With the development of high-speed and heavy-haul railway transportation, the surface failure of rail turnouts has become increasingly severe due to insufficient high hardness-toughness combination. In this work, in situ bainite steel matrix composites with WC primary reinforcement were fabricated via direct laser deposition (DLD). With the increased primary reinforcement content, the adaptive adjustments of the matrix microstructure and in situ reinforcement were obtained at the same time. Furthermore, the dependence of the adaptive adjustment of the composite microstructure on the composites’ balance of hardness and impact toughness was evaluated. During DLD, the laser induces an interaction among the primary composite powders, which leads to obvious changes in the phase composition and morphology of the composites. With the increased WC primary reinforcement content, the dominant sheaves of the lath-like bainite and the few island-like retained austenite are changed into needle-like lower bainite and plenty of block-like retained austenite in the matrix, and the final reinforcement of Fe3W3C and WC is obtained. In addition, with the increased primary reinforcement content, the microhardness of the bainite steel matrix composites increases remarkably, but the impact toughness decreases. However, compared with conventional metal matrix composites, the in situ bainite steel matrix composites manufactured via DLD possess a much better hardness-toughness balance, which can be attributed to the adaptive adjustment of the matrix microstructure. This work provides a new insight into obtaining new materials with a good combination of hardness and toughness.

DOI

10.3390/ma16124437

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

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