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

Song Yong; Zhu Wei; Li Sheng; Zhang Cong; Qiu Changjun

doi:10.3788/CJL202047.0402004

Chinese Journal of Lasers, Volume. 47, Issue 4, 402004(2020)

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

Song Yong, Zhu Wei, Li Sheng, Zhang Cong, and Qiu Changjun^*

Author Affiliations

Mechanical Engineering School, University of South China, Hengyang, Hunan 421001, China

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Figures & Tables(12)

$Morphology of AISI304 powder before and after nitriding. (a) Before nitriding; (b) after nitriding (mass fraction of nitrogen is 0.41%)$

Fig. 1. Morphology of AISI304 powder before and after nitriding. (a) Before nitriding; (b) after nitriding (mass fraction of nitrogen is 0.41%)

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Fig. 2. Laser cladding process and preparation and size of tensile samples. (a) Schematic of laser cladding; (b) sampling and size of tensile sample

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Fig. 3. Section mirror images of cladding layer samples. (a) CL1; (b) CL2; (c) CL3; (d) CL4; (e) CL5

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Fig. 4. Microstructure analysis of each cladding layer sample. (a) XRD spectra; (b) SEM image; (c) EDS analysis

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Fig. 5. Microhardness of cladding layer samples

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$Tensile stress-strain curves and tensile fracture. (a) Stress-strain curves; (b) tensile fracture morphology of sample CL3$

Fig. 6. Tensile stress-strain curves and tensile fracture. (a) Stress-strain curves; (b) tensile fracture morphology of sample CL3

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Fig. 7. Friction coefficient versus time for each cladding sample

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Fig. 8. Electrochemical cathode polarization curve for each cladding layer sample

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Table 1. Code and nitrogen content of nitrogenous austenitic stainless steel powder and cladding layer samples

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Table 1. Code and nitrogen content of nitrogenous austenitic stainless steel powder and cladding layer samples

Powdercode	Mass fractionof nitrogenin power /%	Mass fractionof nitrogen incladding layersamples /%	Samplecode
PN1	0.16	0.13	CL1
PN2	0.37	0.18	CL2
PN3	0.41	0.25	CL3
PN4	0.44	0.29	CL4
PN5	0.47	0.34	CL5
AISI304	≤0.08	≤0.08	AISI304CL

Table 2. XRD quantitative analysis of cladding layer samples
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Table 2. XRD quantitative analysis of cladding layer samples
Sample code Mass fraction /%
Austenite CrN Cr₂N
CL1 99.0 1.0 0
CL2 88.5 11.5 0
CL3 90.4 8.4 1.2
CL4 91.7 3.5 4.8
CL5 94.6 0 5.4
AISI304CL 100 0 0

Table 3. Tensile properties of cladding layer samples
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Table 3. Tensile properties of cladding layer samples
Samplecode Tensile property
σ_b /MPa σ_0.2 /MPa Elongation /%
CL1 677±10 484±10 36±2
CL2 776±10 658±20 24.5±2
CL3 856±20 747±15 22±3
AISI304CL 535±10 411±10 40±3

Table 4. Electrochemical parameters of each cladding sample
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Table 4. Electrochemical parameters of each cladding sample
Sample code Corrosionpotential E /V Corrosion rate /(g·m^-2 h^-1)
CL1 0.0777 1.6198×10^-5
CL2 -0.0628 8.4656×10^-5
CL3 -0.3470 3.2119×10^-4
AISI304CL -0.6429 3.6241×10^-4

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Song Yong, Zhu Wei, Li Sheng, Zhang Cong, Qiu Changjun. Microstructure and Properties of Nitrogenous Austenitic Stainless Steel Prepared Using Laser Cladding[J]. Chinese Journal of Lasers, 2020, 47(4): 402004

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