Breaking the hardness-toughness trade-off in WC-Co hardmetals: Introduction of dual-scale plate-like WC and modification of prediction models
作者:Lu, ZC (Lu, Zhongchen) [1] , [3] ; Wang, W (Wang, Wei) [2] , [3] ; Zeng, MQ (Zeng, Meiqin) [2] , [3] ; Zhu, M (Zhu, Min) [2] , [3]
卷108
文献号105910
DOI10.1016/j.ijrmhm.2022.105910
出版时间NOV 2022
在线发表JUN 2022
已索引2022-07-03
文献类型Article
摘要
The hardness-toughness trade-off relationship is an essential challenge when creating high-performance WC-Co hardmetals. In this work, by combining plasma milling and low-pressure sintering, a dual-scale plate-like WC-8Co hardmetal is fabricated. The hardmetal simultaneously exhibits ultra-high strength (1701 kgf/mm(2)) and fracture toughness (21.77 MPa*m1/2), with bimodal grain size distributions of plate-like WC with average diameter of 1.1 mu m and 1.4 mu m, respectively. This breaks the normal trade-off relationship between the strength and the fracture toughness, which is because of the enhancement of crack propagation resistance owing to the synergetic effect of the plate-like WC and the bimodal grain structure. Existing models for hardness and fracture toughness prediction are invalid for WC-Co hardmetals with oriented plate-like WC grains. Modified models, based on the Lee-Gurland hardness model and the Ravichandran fracture toughness model, are developed by inducing factors R, which is the proportion of the WC(0001) plane in the indented plane, and can be determined by XRD analysis, to represent morphology features of WC. The modified models are universal and can reliably predict the hardness and fracture toughness of WC-Co hardmetals with both equiaxial and plate-like WC grains.
关键词
作者关键词WC-Co hardmetalsPlasma millingPlate-like WCHardening-toughening relationship
Keywords PlusCRACK DEFLECTION PROCESSESCEMENTED CARBIDESWC-8CO HARDMETALSFRACTURE-TOUGHNESSTUNGSTEN CARBIDEWT.PERCENT-COGRAIN-SIZEULTRAFINEFABRICATIONSTRENGTH
作者信息
通讯作者地址
Zhu, Min
(通讯作者)
South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Peoples R China
地址
1 South China Univ Technol, Sch Mech & Automot Engn, Guangzhou 510640, Peoples R China
2 South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Peoples R China
3 Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510640, Peoples R China
电子邮件地址memzhu@scut.edu.cn
类别/分类
研究方向Materials ScienceMetallurgy & Metallurgical Engineering
引文主题
7 Engineering & Materials Science
7.109 Ceramics
7.109.1110 Laser Cladding
Web of Science 类别Materials Science, MultidisciplinaryMetallurgy & Metallurgical Engineering