Microstructure and Properties of Nitrogenous Austenitic Stainless Steel Prepared Using Laser CladdingAAA

In this study, AISI304 powder processed with solution-nitriding in super pure nitrogen flow as raw material was used to prepare austenite stainless steels cladding layer with different nitrogen contents to obtain the laser cladding layer of nitrogenous austenitic stainless steel with excellent comprehensive performance. Results show that nitrogen precipitates during laser cladding process and pores appear in the cladding layer. As the nitrogen content in powder increases, the nitrogen content in the cladding layer gradually increases,the porosity first increases and then decreases and the strengths significantly enhances, while the elongation gradually decreases. For the cladding layer prepared with power with nitrogen mass fraction of 0.41%, its nitrogen mass fraction is 0.25%, tensile strength is (856 +/- 20) MPa, yield strength is (747 +/- 15) MPa, elongation is (22 +/- 3)% and microhardness is 280.68 HV0.2. For the cladding layer prepared with power with nitrogen mass fraction of 0.16%, its corrosion potential and corrosion rate are 0.0777 V and 1.6198X10 -5 g/(m 2.h) respectively, which are higher than that of the AISI304 cladding layer.