High-temperature mechanical behavior of ultra-coarse cemented carbide with grain strengthening

Huaxin Hu, Xuemei Liu, Jinghong Chen, Hao Lu, Chao Liu, Haibin Wang, Junhua Luan, Zengbao Jiao, Yong Liu, Xiaoyan Song

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Ultra-coarse grained cemented carbides are often used under conditions of concurrently applied stress and high temperature. Improvement of high-temperature mechanical performance of ultra-coarse grained cemented carbides is highly desirable but still a big challenge. In this study, it is proposed that the high-temperature compression strength of ultra-coarse cemented carbides can be enhanced by modulating hard matrix grains by activated TaC nanoparticles, through solid solution strengthening of Ta atoms. Based on the designed experiments and microstructural characterizations combined with finite element simulations, the grain morphology, stress distribution and dislocation configuration were studied in detail for ultra-coarse grained cemented carbides. The mechanisms of Ta dissolving in WC crystal and strengthening ultra-coarse grains through interaction with dislocations were disclosed from the atomic scale. This study opens a new perspective to modulate hard phases of cemented carbides for improving their high-temperature performance, which will be applicable to a variety of cermet and ceramic-based composite materials.

Original languageEnglish
Pages (from-to)8-18
Number of pages11
JournalJournal of Materials Science and Technology
Volume104
DOIs
Publication statusPublished - 30 Mar 2022

Keywords

  • Dislocation motion
  • High-temperature compressive behavior
  • Strengthening of hard-phase grains
  • Ultra-coarse cemented carbides

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Polymers and Plastics
  • Metals and Alloys
  • Materials Chemistry

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