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Interfacial thermal fatigue behavior of cast tungsten carbide particle/steel matrix surface composites

Published online by Cambridge University Press:  08 November 2019

Zulai Li
Affiliation:
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China; and National & Local Joint Engineering Laboratory of Advanced Metal Solidification Forming and Equipment Technology, Kunming University of Science and Technology, Kunming 650093, People’s Republic of China
Donglan Zhang
Affiliation:
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China; and National & Local Joint Engineering Laboratory of Advanced Metal Solidification Forming and Equipment Technology, Kunming University of Science and Technology, Kunming 650093, People’s Republic of China
Quan Shan*
Affiliation:
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China; and National & Local Joint Engineering Laboratory of Advanced Metal Solidification Forming and Equipment Technology, Kunming University of Science and Technology, Kunming 650093, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In this study, cast tungsten carbide particle/steel matrix surface composites were fabricated using a vacuum evaporative pattern casting (V-EPC) infiltration process. Through thermal shock tests at 500 °C, the initiation and propagation of cracks at the interface of the composites were investigated. Owing to the mismatch in the coefficients of thermal expansion (CTE), cracks tended to appear at the interface reaction zone (IRZ) between the particles and the matrix. Because there was also a difference in the CTE between the composite and the substrate, the cracks propagated rapidly along the transition layer (TL) between the composite and the substrate, and finally connected to form macro-cracks. Based on the stress analysis and calculation, the maximum thermal stress at the TL was 63.4 MPa, while the maximum thermal stress at the IRZ was 38 MPa. It could thus be inferred that the TL is the weak link under thermal fatigue. In addition, the experimental results were verified and found to be in good agreement with the calculations.

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Article
Copyright
Copyright © Materials Research Society 2019 

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