研究目的
To develop an innovative method of laser polishing assisted by a steady magnetic field to overcome the bottleneck in reducing surface roughness and produce smoother surfaces.
研究成果
The study demonstrated that a steady magnetic field can significantly suppress molten pool overflow during CW laser polishing, leading to smoother surfaces with a roughness reduction of over 91% from the initial state. The microhardness of the polished surface also increased by up to 112.5% compared to the original surface. These achievements were realized with the aid of a steady magnetic field whose intensity was B = 0.4 T.
研究不足
The study is limited to the use of S136H tool steel and may not be directly applicable to other materials without further research. The effectiveness of the magnetic field is dependent on its intensity, with optimal results observed at 0.4 T.
1：Experimental Design and Method Selection:
The study involved using a CW laser for polishing tool steel surfaces, with and without the assistance of a steady magnetic field, to compare the effects on surface roughness.
2：Sample Selection and Data Sources:
S136H tool steel samples were used, with initial roughness measurements taken before and after polishing.
3：List of Experimental Equipment and Materials:
Equipment included a CW laser generator, a beam expander, a scanning head, a process chamber with a steady magnetic field system (PEM-150), a white-light interferometer (BRUKER WYKO Contour GT-K), a nano-indenter (Hysitron TI 950), and a scanning electron microscope (SEM) (LYRA 3 XMU).
4：Experimental Procedures and Operational Workflow:
The experiments involved multi-pass polishing with varying laser powers, scanning speeds, and magnetic field intensities.
5：Data Analysis Methods:
Surface roughness and microhardness were measured, and SEM images were analyzed to characterize the microstructure and properties of the polished surfaces.
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