研究目的
Investigating the microstructural characteristics and hardness of Cr-coated Zr702 sheet after laser surface treatment (LST) to achieve surface Cr alloying and improve surface properties.
研究成果
The LST processing at 100 W significantly alters the surface microstructure of Cr-coated Zr702 sheet, forming distinct zones with Cr alloying in the MZ and martensitic plates in the SSPTZ. This leads to a remarkable increase in surface hardness by ~110%, attributed to Cr solid solution, dense second phases, and grain refinement.
研究不足
The study focuses on the microstructural and hardness changes induced by LST on Cr-coated Zr702 sheet. The limitations include the specific laser power used (100 W) and the focus on surface properties without extensive exploration of bulk material changes or long-term performance under operational conditions.
1：Experimental Design and Method Selection:
The study employed pulsed laser surface treatment on Cr-coated Zr702 sheet to investigate microstructural changes and hardness improvement. Techniques included electron backscatter diffraction, electron channeling contrast imaging, energy dispersive spectrometry, and hardness measurement.
2：Sample Selection and Data Sources:
A 2-mm-thick Zr702 sheet after rolling and recrystallization annealing was used. Specimens were cut and coated with Cr by brush plating at room temperature.
3：List of Experimental Equipment and Materials:
A Nd:YAG laser device (HWLW-600A-C-V5.2.01) was used for irradiation. Other equipment included FEGSEM (Zeiss Sigma HD), EBSD system (NordlysMax2 detector), Vickers indenter (HVS-1000Z), and optical microscope (DMI5000 M).
4：01) was used for irradiation. Other equipment included FEGSEM (Zeiss Sigma HD), EBSD system (NordlysMax2 detector), Vickers indenter (HVS-1000Z), and optical microscope (DMI5000 M).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The Cr-coated surface was irradiated with pulsed laser under Ar gas to prevent oxidation. Microstructural characterization was performed on the RD-ND plane. Hardness measurements were conducted on the RD-TD surface.
5：Data Analysis Methods:
Data acquisition and post-processing were performed by Aztec 2.4 and HKL Channel 5 software packages. Hardness data were analyzed to correlate with microstructural characteristics.
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