Laser Surface Treatment of Sintered Stainless Steels for Wear Resistance Enhancement

Zbigniew Brytan; Wojciech Pakieła

doi:10.4028/www.scientific.net/KEM.813.221

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 813Laser Surface Treatment of Sintered Stainless...

Laser Surface Treatment of Sintered Stainless Steels for Wear Resistance Enhancement

Abstract:

In the present study, sintered austenitic stainless steel type 316L was laser surface alloyed with Inconel 625 powder by the fibre optic laser. The Inconel 625 spheroidal powder of grain size 60-150 μm was introduced by the coaxial feeding head directly to the liquid metal, during laser surface alloying. The process parameters were selected to melt and fully dissolve alloying powder into the alloyed surface. As a result of laser alloying, the porosity of sintered stainless steel was eliminated, a uniform distribution of nickel and molybdenum in the entire alloyed zone was obtained. The alloyed surface shows fully austenitic microstructure of 17%Cr, 18%Ni, 3%Mo. The superficial hardness, microhardness and surface wear resistance were significantly improved in respect to an untreated substrate material. The presented technique of laser surface alloying can be easily applied for sintered austenitic stainless steel components where selected component surfaces require an improved surface performance.

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Periodical:

Key Engineering Materials (Volume 813)

Pages:

221-227

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.813.221

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Online since:

July 2019

Authors:

Zbigniew Brytan*, Wojciech Pakieła

Keywords:

Hardness, Inconel 625, Laser Surface Alloying (LSA), Sintered Stainless Steels 316L, Wear Resistance

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References

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