研究目的
To improve the wear resistance of 316 L stainless steel by synthesizing an MC (M: Ti,Nb) carbide-reinforced 316 L coating in-situ via laser cladding and to establish a relationship between the (Ti,Nb)C content and the microstructure and tribological properties of the resulting components.
研究成果
The study successfully fabricated in-situ formed (Ti,Nb)C carbide-reinforced 316 L composite coatings via laser cladding. The morphology of in-situ generated (Ti,Nb)C particles evolved with increasing carbide content, affecting the microstructure and tribological properties. The coatings with 5 wt% and 20 wt% (Ti,Nb)C exhibited lower friction coefficients and wear volume losses, indicating improved wear resistance.
研究不足
The study focuses on the in-situ synthesis of (Ti,Nb)C reinforced 316 L stainless steel matrix composites via laser cladding. The limitations include the specific laser cladding parameters used and the focus on room-temperature dry sliding friction and wear tests.
1：Experimental Design and Method Selection:
The study used laser cladding to synthesize in-situ (Ti,Nb)C reinforced 316 L stainless steel matrix composites. The experiment employed a single-pass cladding strategy with a preset powder method.
2：Sample Selection and Data Sources:
Commercially-available 316 L SS was used as the substrate. The powder system included Ti, Nb, graphite, and 316 L powders with specific particle sizes.
3：List of Experimental Equipment and Materials:
An Nd:YAG laser cladding machine (LSSK-009) was used. High-purity Ar was used as a protective gas. The microhardness was measured using a FM700 micro Vickers hardness tester, and dry sliding friction and wear tests were conducted using a UMT-3 multi-functional tester.
4：Experimental Procedures and Operational Workflow:
A 1.5 mm layer of mixed powder was placed on the 316 L SS substrate. The laser cladding parameters included a laser power of 600 W, pulse duration of 35 ms, pulse frequency of 14 Hz, and scanning speed of 200 mm/min.
5：5 mm layer of mixed powder was placed on the 316 L SS substrate. The laser cladding parameters included a laser power of 600 W, pulse duration of 35 ms, pulse frequency of 14 Hz, and scanning speed of 200 mm/min.
Data Analysis Methods:
5. Data Analysis Methods: Phase analysis was performed using XRD. The microstructure was observed using SEM, and the micro-area composition was analyzed using EDS. The microhardness and tribological properties were measured and analyzed.
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