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http://dx.doi.org/10.4150/KPMI.2022.29.4.314

Effect of Laser Beam Diameter on the Microstructure and Hardness of 17-4 PH Stainless Steel Additively Manufactured by Direct Energy Deposition  

Kim, Woo Hyeok (Department of Materials Science & Engineering, Hanbat National University)
Go, UiJun (Department of Materials Science & Engineering, Hanbat National University)
Kim, Jeoung Han (Department of Materials Science & Engineering, Hanbat National University)
Publication Information
Journal of Powder Materials / v.29, no.4, 2022 , pp. 314-319 More about this Journal
Abstract
The effect of the laser beam diameter on the microstructure and hardness of 17-4 PH stainless steel manufactured via the directed energy deposition process is investigated. The pore size and area fraction are much lower using a laser beam diameter of 1.0 mm compared with those observed using a laser beam diameter of 1.8 mm. Additionally, using a relatively larger beam diameter results in pores in the form of incomplete melting. Martensite and retained austenite are observed under both conditions. A smaller width of the weld track and overlapping area are observed in the sample fabricated with a 1.0 mm beam diameter. This difference appears to be mainly caused by the energy density based on the variation in the beam diameter. The sample prepared with a beam diameter of 1.0 mm had a higher hardness near the substrate than that prepared with a 1.8 mm beam diameter, which may be influenced by the degree of melt mixing between the 17-4 PH metal powder and carbon steel substrate.
Keywords
Additive manufacturing; Laser beam diameter; 17-4PH; Pores; Hardness;
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