研究目的
To enhance the wear resistance of sintered austenitic stainless steel type 316L through laser surface alloying with Inconel 625 powder.
研究成果
Laser surface alloying with Inconel 625 significantly improved the hardness, microhardness, and wear resistance of sintered austenitic stainless steel type 316L. The alloyed layer exhibited a uniform microstructure and elimination of porosity, making it suitable for components requiring enhanced surface performance.
研究不足
The study focused on the mechanical properties enhancement through LSA, with limited discussion on the corrosion resistance improvement. The process parameters were optimized for specific conditions, which may not be universally applicable.
1：Experimental Design and Method Selection:
The study involved laser surface alloying (LSA) of sintered austenitic stainless steel type 316L with Inconel 625 powder using a 4 kW fiber laser. The process parameters were optimized to ensure complete melting and dissolution of the alloying powder into the surface.
2：Sample Selection and Data Sources:
The substrate material was uniaxially pressed and vacuum sintered austenitic stainless steel. Inconel 625 powder of specific grain size was used for alloying.
3：List of Experimental Equipment and Materials:
A 4 kW fiber laser YLS 4000 IPG, Inconel 625 spheroidal powder, argon gas for protection, and an aluminium support plate were used.
4：Experimental Procedures and Operational Workflow:
The laser alloying process involved feeding the Inconel powder into the molten pool at a controlled rate, with argon gas protection. The samples were analyzed for microstructure, hardness, and wear resistance.
5：Data Analysis Methods:
The analysis included stereoscopic microscopy, contact profilometry, light and scanning electron microscopy, EDS analysis, XRD analysis, Rockwell and Vickers hardness testing, and tribological testing.
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YLS 4000 IPG
YLS 4000
IPG
Used for laser surface alloying of the sintered austenitic stainless steel with Inconel 625 powder.
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Sutronic 25 Tylor Hobson contact profilometer
Sutronic 25
Tylor Hobson
Used for measuring the roughness and waviness of the surface, as well as traces of wear after the tribological test.
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Zeiss Supra 35 scanning electron microscope
Supra 35
Zeiss
Used for observations of layer and substrate microstructure.
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Inconel 625 spheroidal powder
Used as the alloying material for laser surface alloying to enhance the surface properties of the stainless steel.
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