研究目的
Investigating the influence of work media (air and water) on the wear resistance and thermal fatigue resistance of compacted graphite cast iron (CGI) processed by laser local processing.
研究成果
Laser local processing can enhance the wear resistance and thermal fatigue resistance of CGI. Processing in water refines microstructures and enhances micro-hardness, improving wear resistance and resistance to thermal crack initiation but not resistance to thermal crack propagation due to cracks on bionic units.
研究不足
The study found that while laser processing in water improved resistance to thermal crack initiation, it did not improve resistance to thermal crack propagation due to cracks on bionic units.
1：Experimental Design and Method Selection:
The study used laser local processing to create bionic units on CGI specimens under different work media (air and water).
2：Sample Selection and Data Sources:
Specimens were cut from CGI disc brakes of high-speed trains.
3：List of Experimental Equipment and Materials:
Solid state Nd-YAG laser, M-200 wear tester, self-restrained thermal fatigue testing machine, Olympus PMG3 metallographic microscope, D/max 2500PC X-ray diffraction (XRD), Zeiss EVO18 scanning electron microscopy (SEM), 5104 Vickers Micro-hardness Tester.
4：Experimental Procedures and Operational Workflow:
Laser processing parameters were set, wear tests and thermal fatigue tests were conducted, and microstructure and phase composition were analyzed.
5：Data Analysis Methods:
Wear loss was measured, thermal cracks were counted and measured, and micro-hardness was tested.
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Zeiss EVO18 scanning electron microscopy (SEM)
EVO18
Zeiss
Used for structure analysis of the specimens.
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Solid state Nd-YAG laser
Used for laser local processing to create bionic units on CGI specimens.
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M-200 wear tester
Used to conduct wear tests on the specimens.
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Self-restrained thermal fatigue testing machine
Used to conduct thermal fatigue tests on the specimens.
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Olympus PMG3 metallographic microscope
Olympus
Used to observe the surface morphology of the specimens.
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D/max 2500PC X-ray diffraction (XRD)
D/max 2500PC
Used for structure analysis of the specimens.
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5104 Vickers Micro-hardness Tester
5104
Buehler Co. Ltd.
Used to measure the micro-hardness of the bionic units.
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