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High-temperature mechanical behavior of ultra-coarse cemented carbide with grain strengthening
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作者 huaxin hu Xuemei Liu +7 位作者 Jinghong Chen Hao Lu Chao Liu Haibin Wang Junhua Luan Zengbao Jiao Yong Liu Xiaoyan Song 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第9期8-18,共11页
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 carbid... 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 hightemperature compression strength of ultra-coarse cemented carbides can be enhanced by modulating hard matrix grains by activated Ta C 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 hightemperature performance,which will be applicable to a variety of cermet and ceramic-based composite materials. 展开更多
关键词 Ultra-coarse cemented carbides High-temperature compressive behavior Strengthening of hard-phase grains Dislocation motion
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