4.7 Article

On the enhanced wear resistance of ultra-coarse WC-Co cemented carbides by WCoB addition

期刊

JOURNAL OF ALLOYS AND COMPOUNDS
卷 894, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.162449

关键词

Ultra-coarse cemented carbide; WCoB; Wear resistance; Spall off; Stress distribution

资金

  1. National Natural Science Foundation of China [51631002, U20A20236]
  2. National Key Program of Research and Development [2018YFB0703902]
  3. Beijing Natural Science Foundation [2202011]

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The addition of WCoB significantly improves the wear resistance of ultra-coarse cemented carbides, mainly due to the high hardness of WCoB balancing the stress distribution within WC grains, reducing the likelihood of fracture and pull-out during the wear process.
The effect of the WCoB addition on the wear resistance of the ultra-coarse WC-8Co cemented carbides was studied by experiments and finite element simulations. The results showed that with the increase of the WCoB content, the wear resistance of the ultra-coarse cemented carbides was greatly improved. The cemented carbide containing 1.0 wt.% WCoB had a friction coefficient of 0.281 and a wear rate of 0.77 x 10-6 mm3/N.m, which was 72% and 46% of those of the WC-8Co counterpart. The reason of the significant reduction of the friction coefficient and wear rate was analyzed. WCoB with high hardness distributed homogeneously at WC/WC and WC/Co interfaces, which led to relatively homogeneous distribution of the stress in WC grains and supported the WC grains after Co removal. Consequently, the probability of brittle fracture and pull-out of the WC grains during wear process of the cemented carbides was decreased. (c) 2021 Elsevier B.V. All rights reserved.

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