研究目的
Investigating the microstructural and metallurgical changes of WC-CoNi cemented carbides modified by ultra-short pulse laser processing for tribological purposes.
研究成果
The study demonstrated that ultra-short pulse laser processing can fabricate surface patterns on WC-CoNi cemented carbides with high geometric precision and minimal thermal defects. Different laser parameters influence the material removal mechanism, with selective ablation of the binder phase observed. The findings suggest that laser surface texturing (LST) is a viable method for modifying cemented carbides for tribological applications, offering advantages over traditional methods like EDM in terms of surface integrity.
研究不足
The study is limited to WC-CoNi cemented carbides and specific laser processing parameters. The depth of microstructural changes is shallow (less than 2μm), and the study does not extensively cover the long-term performance of the textured surfaces in tribological applications.
1：Experimental Design and Method Selection:
The study involved creating three different patterns (line-like patterns, dimples, and grooves) on WC-CoNi cemented carbides using laser set-ups with varying pulse durations (nanoseconds, picoseconds, and femtoseconds). Laser scanning microscopy (LSM) was used for geometric characterization, and focused ion beam (FIB) combined with scanning electron microscope (SEM) was employed for microstructural analysis.
2：Sample Selection and Data Sources:
Specimens of WC-CoNi cemented carbides with specific dimensions were prepared by EDM before laser processing.
3：List of Experimental Equipment and Materials:
Equipment included nanosecond Nd:YAG laser, picosecond laser system (HYPER25), and femtosecond Ti:Sapphire laser. Materials involved WC-CoNi cemented carbides.
4：Experimental Procedures and Operational Workflow:
The surfaces were polished before laser treatment. Different laser parameters (fluence, wavelength, pulse duration) were applied to create the patterns. Post-processing, LSM and FIB/SEM were used for analysis.
5：Data Analysis Methods:
Geometric properties of patterns were measured using LSM. Microstructural changes were investigated through FIB/SEM analysis.
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