研究目的
Assessing the possibility of improving the properties of ZhGr powder steel by laser heat treatment.
研究成果
Laser treatment produces regions with increased microhardness, with size depending on laser power density and speed. Minimal porosity is observed at the sample surface, but cracks may form in samples with considerable porosity. The microhardness of pore-free samples is more uniformly distributed.
研究不足
The presence of porosity in the steel components requires specific heating conditions before quenching, longer heating times, and increased cooling rates. The laser heat treatment may introduce defects such as cracks.
1：Experimental Design and Method Selection:
Laser heat treatment of sintered ZhGr ferrocarbon powder steel with different porosity.
2：Sample Selection and Data Sources:
Powder steel samples produced from PZhRV
3：28 iron powder and S-1 graphite powder. List of Experimental Equipment and Materials:
Optomec LENS 850-R system with a 1-kW fiber layer for laser surface treatment, VLA-200g-M analytical scales, 402MVD Knoop/Vickers tester.
4：Experimental Procedures and Operational Workflow:
Single passes of the laser beam in an argon atmosphere, varying power density, diameter of the laser beam, and speed of the laser beam.
5：Data Analysis Methods:
Vickers hardness measurement, microstructure analysis.
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