Investigation of ultrafine WC–Co–Fe–Ni–Cr3C2 cemented carbide microstructure and properties based on phase diagram thermodynamics
Author:
Zhao Hongjin1, Shen Wuyi1, Tian Haixia1ORCID, Xu Guozuan23, Du Yong3
Affiliation:
1. School of Material Science and Engineering , Jiangxi University of Science and Technology , Ganzhou , P.R. China 2. Chongyi Zhangyuan Tungsten Co, Ltd , Ganzhou , P.R. China 3. State Key Lab of Powder Metallurgy , Central South University , Changsha , Hunan , P.R. China
Abstract
Abstract
In this work, different Fe/Ni ratios with constant Co content were prepared to explore microstructure and properties of ultrafine WC-10 wt.%(Co–Fe–Ni)-Cr3C2 cemented carbides. The increase in Fe content in binder has difficulty in controlling carbon content. Therefore, the carbon window was determined by phase diagram to prepare carbon-balanced cemented carbides. The increase in Fe/Ni ratio in the binder deteriorates the uniformity of the binder phase distribution and refines the WC and binder phase grains by affecting the solubility of WC in binder and the wettability of the binder. Grain size, microstructural irregularities and solid solution strengthening of binder phase affect the mechanical properties of cemented carbides. The relative density of cemented carbide with Fe/Ni = 30:70 in the binder is 99.8 % and the transverse fracture strength is 2449 MPa maximum, but the fracture toughness is slightly low. Because of the passivation characteristics of Ni, the alloy with Fe/Ni = 0:100 in the binder has better resistance to corrosion resistance.
Publisher
Walter de Gruyter GmbH
Subject
Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics
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