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<p>The energy transfer process of selective laser melting (SLM) is highly complex. In this work, experiments were carried out to study the effects of SLM on the microstructure and mechanical properties of 18Ni300 martensitic steel. With the increase in laser power, the grain size of the cladding layer decreases and the microstructure becomes dense. The side hardness is higher than upper surface hardness, and the tensile strength and elongation both increase first and then decrease. When the laser power is 300 W and the scanning speed is 1,000 mm/s, the comprehensive mechanical properties are the best, as the tensile strength, microhardness, elongation at break, and elongation after fracture are 1,217 MPa, 37.5%, 37.6%, and 8.93%, respectively. EBSD (Electron Backscatter Diffraction) shows that columnar crystals grow along the growth direction (<italic>z</italic> direction) in XOZ and YOZ planes, and the grains show weak texture. There are many small-angle grain boundaries, and the grain sizes are &lt;10 μm.</p>
</abstract>

The energy transfer process of selective laser melting (SLM) is highly complex. In this work, experiments were carried out to study the effects of SLM on the microstructure and mechanical properties of 18Ni300 martensitic steel. With the increase in laser power, the grain size of the cladding layer decreases and the microstructure becomes dense. The side hardness is higher than upper surface hardness, and the tensile strength and elongation both increase first and then decrease. When the laser power is 300 W and the scanning speed is 1,000 mm/s, the comprehensive mechanical properties are the best, as the tensile strength, microhardness, elongation at break, and elongation after fracture are 1,217 MPa, 37.5%, 37.6%, and 8.93%, respectively. EBSD (Electron Backscatter Diffraction) shows that columnar crystals grow along the growth direction (z direction) in XOZ and YOZ planes, and the grains show weak texture. There are many small-angle grain boundaries, and the grain sizes are <10 μm.

Microstructure and mechanical properties of selective laser melted 18Ni300 steel

Dept. of Material Science and Engineering, School of Materials Science and Engineering

Jiang Su University of Science and Technology

Dept. of Material Science and Engineering, School of Intelligent Manufacturing and Control Engineering

Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

{"article-title":"Microstructure and mechanical properties of selective laser melted 18Ni300 steel"}

The energy transfer process of selective laser melting (SLM) is highly complex. In this work, experiments were carried out to study the effects of SLM on the...

Microstructure and mechanical properties of selective laser melted 18Ni300 steel

Publié en ligne: 31 déc. 2022

Pages: 64 - 71

Reçu: 20 sept. 2022

Accepté: 25 nov. 2022

DOI: https://doi.org/10.2478/msp-2022-0031

Mots clés
selective laser melting, 18Ni300, temperature field, grain size

© 2022 Yan Liang et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Microstructure and mechanical properties of selective laser melted 18Ni300 steel

Publié en ligne: 31 déc. 2022

Pages: 64 - 71

Reçu: 20 sept. 2022

Accepté: 25 nov. 2022

DOI: https://doi.org/10.2478/msp-2022-0031

Mots clésselective laser melting, 18Ni300, temperature field, grain size

© 2022 Yan Liang et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Mots clés
selective laser melting, 18Ni300, temperature field, grain size