E3S Web Conf.
Volume 268, 20212020 6th International Symposium on Vehicle Emission Supervision and Environment Protection (VESEP2020)
|Number of page(s)||7|
|Published online||11 June 2021|
Fibrous nano composite reinforced surface on WC-Co cemented carbide achieved by pulsed electron beam irradiation and subsequent tempering
1 Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, China
2 School of Material Science and Engineering, Dalian University of Technology, Dalian 116024, China
3 School of Material Science and Engineering, Dalian Jiaotong University, Dalian 116021, China
* Corresponding author: email@example.com
Exotic microstructures can be tailored by extreme conditions with combined material processing techniques for desirable properties. In this work, an innovative 2-staged process was explored for WC-10Co cemented carbide surface modification. Firstly, rapid thermal cycles were induced by high current pulsed electron beam (HCPEB) irradiation at energy density of 6 J/cm2, during which the micro-WC/Co was melted and re-solidified into a nano-scaled equiaxed grain microstructure with metastable fcc-WC1-x as the majority phase in the surface layer (~2 μm). Thereafter, a subsequent tempering process was applied to the HCPEB-irradiated cemented carbide specimens and the nano equiaxed grains in the surface layer were gradually transferred into nano-scaled fibrous microstructure. Phase transformation was investigated using thermo-gravimetric analysis differential scanning calorimetry (TGA-DSC), confocal laser scanning microscopy (CLSM), scanning electron microscopy (SEM) and X-ray diffractometry (XRD). Analysis showed that the fibrous nano structure resulted from the decomposition of WC1-x at 600-700 ºC via fcc-WC1-x → hex-WC + hcp-W2C. After the 2-staged process, the surface microhardness was greatly improved.
Key words: surface modification / cemented carbide / microstructure evolution / high current pulsed electron beam (HCPEB) / tempering / solid state phase transformation
© The Authors, published by EDP Sciences, 2021
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