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Microstructure and mechanical properties of selective laser melted 18Ni300 steel

Yan Liang

Yan Liang

  • Dept. of Material Science and Engineering, School of Materials Science and Engineering, Jiang Su University of Science and Technologyzhenjiang, China
  • Dept. of Material Science and Engineering, School of Intelligent Manufacturing and Control Engineering, Shanghai Polytechnic UniversityShanghai, China
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Liang, Yan
, 
Luo Qing

Luo Qing

Dept. of General Dentistry, Shsnghai Xuhui District Dental CenterShanghai, China
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Qing, Luo
, 
He Yu

He Yu

Cancer Center, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai, China
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Yu, He
, 
Zhao Huili

Zhao Huili

Nursing Department, Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai, China
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Huili, Zhao
 and 
Wang Yuxin

Wang Yuxin

Dept. of Material Science and Engineering, School of Materials Science and Engineering, Jiang Su University of Science and Technologyzhenjiang, China
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Yuxin, Wang
  
Dec 31, 2022
Microstructure and mechanical properties of selective laser melted 18Ni300 steel's Cover Image
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Published Online: Dec 31, 2022
Page range: 64 - 71
Received: Sep 20, 2022
Accepted: Nov 25, 2022
DOI: https://doi.org/10.2478/msp-2022-0031
Keywords
© 2022 Yan Liang et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

SEM (A) and particle size distribution (B) of 18Ni300 powder
SEM (A) and particle size distribution (B) of 18Ni300 powder

Fig. 2

Illustration of the laser scanning strategy
Illustration of the laser scanning strategy

Fig. 3

Microstructure of the longitudinal section under different laser powers: (A): 270 W, (B) 300 W, (C) 320 W, and (D) 360 W
Microstructure of the longitudinal section under different laser powers: (A): 270 W, (B) 300 W, (C) 320 W, and (D) 360 W

Fig. 4

Effect of laser power on surface hardness
Effect of laser power on surface hardness

Fig. 5

Standard stretch piece
Standard stretch piece

Fig. 6

Stress–strain curves under different laser powers
Stress–strain curves under different laser powers

Fig. 7

Tensile fracture morphology of printed samples under different laser powers: (A) 270 W, (B) 300 W, (C) 320 W, and (D) 360 W
Tensile fracture morphology of printed samples under different laser powers: (A) 270 W, (B) 300 W, (C) 320 W, and (D) 360 W

Fig. 8

Density variation under different laser powers
Density variation under different laser powers

Fig. 9

SEM image (A) and local magnification (B) of the upper surface of the sample
SEM image (A) and local magnification (B) of the upper surface of the sample

Fig. 10

Microstructure analysis of EBSD on the upper surface of the sample: (A) IPF maps of 300 W, (A1) GB maps of 300 W; and (B) IPF maps of 360 W, (B1) GB maps of 360 W. IPF, inverse pole diagram
Microstructure analysis of EBSD on the upper surface of the sample: (A) IPF maps of 300 W, (A1) GB maps of 300 W; and (B) IPF maps of 360 W, (B1) GB maps of 360 W. IPF, inverse pole diagram

Performance comparison under different laser powers

Laser power (W) Rm (MPa) Rp0.2 (MPa) ɛPa 2
270 1,104 1,158 15.1
300 1,106 1,060 17.6
330 990 883 16.2
360 959 866 14.7

Comparison of the chemical composition of declared, powder, and as-fabricated 18Ni300

Element, wt.% Ni Mo Co Ti Cr C Si Mn
Powder 17.8 4.5 8.6 1 0.11 <0.01 <0.032 0.002

Formation process parameters of the 18Ni300 powder

Laser power (W) Scanning speed (mm/s) Path spacing (mm) Layer thickness (μm)
270 1,000 0.11 50
300 1,000 0.11 50
330 1,000 0.11 50
360 1,000 0.11 50
Language:
English
Publication timeframe:
4 times per year
Journal Subjects:
Materials Sciences, Materials Sciences, other, Nanomaterials, Functional and Smart Materials, Materials Characterization and Properties
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