研究目的
To present a novel method for remanufacturing ductile iron brake discs based on coupled bionics to repair thermal fatigue cracks discontinuously using bio-inspired crack blocking units fabricated by laser remelting at various laser energy inputs.
研究成果
The units without defects improved both the thermal fatigue resistance and tensile strength. The optimal laser energy density for crack repair was found to be 165.6+19?15 J/mm2, which provided sufficient depth to fully close the crack and exhibited superior anti-cracking and tensile properties. A unit distance of 3 mm resulted in excellent thermal fatigue resistance.
研究不足
The study focused on ductile iron brake discs and may not be directly applicable to other materials or applications. The effectiveness of the repair method depends on the laser parameters and the initial condition of the cracks.
1：Experimental Design and Method Selection:
The study used a solid-state Nd-YAG pulsed laser to fabricate bio-inspired crack blocking units on ductile iron samples. The laser parameters varied to study their effects on the units' properties.
2：Sample Selection and Data Sources:
Samples were taken from a train brake disc cracked due to thermal fatigue. The chemical composition and microstructure of the ductile iron were analyzed.
3：List of Experimental Equipment and Materials:
Equipment included a digital microhardness meter, optical microscopy, scanning electron microscopy, and X-ray diffraction. Materials were ductile iron samples with preset notches to simulate cracks.
4：Experimental Procedures and Operational Workflow:
Samples were laser-treated with varying parameters, then subjected to tensile and thermal fatigue tests. Microstructure and phases were characterized post-treatment.
5：Data Analysis Methods:
The microhardness, tensile strength, and thermal fatigue resistance of the units were analyzed to determine the optimal laser parameters for crack repair.
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