论文信息 - Influences of Energy Density on Porosity and Microstructure of Selective Laser Melted 17-4PH Stainless Steel

Influences of Energy Density on Porosity and Microstructure of Selective Laser Melted 17-4PH Stainless Steel

Energy density, which directly impacts the properties of as-built parts, is a key factor in the metal selective laser melting (SLM) process. This paper studies the influences of energy density on porosity and microstructure of SLM 17-4PH stainless steel parts. Experiments were carried out by varying processing parameters to change energy density. Porosity was estimated using the Archimedes method and image analysis. Microstructures were investigated through optical and electron microscopy. The experimental results were discussed regarding porosity formation and microstructure characterization.

[1] Li Wang,et al. Balling behavior of stainless steel and nickel powder during selective laser melting process , 2012 .

[2] A. Spierings,et al. Comparison of density measurement techniques for additive manufactured metallic parts , 2011 .

[3] V. Mikli,et al. CHARACTERIZATION OF POWDER PARTICLE MORPHOLOGY , 2001, Proceedings of the Estonian Academy of Sciences. Engineering.

[4] I. Lonardelli,et al. Metastable Austenite in 17–4 Precipitation‐Hardening Stainless Steel Produced by Selective Laser Melting , 2010 .

[5] C. F. Jatczak. Retained Austenite and Its Measurement by X-Ray Diffraction , 1980 .

[6] J. Kruth,et al. A study of the microstructural evolution during selective laser melting of Ti–6Al–4V , 2010 .

[7] Yifu Shen,et al. Balling phenomena in direct laser sintering of stainless steel powder: Metallurgical mechanisms and control methods , 2009 .

[8] N. Page,et al. Selection of Descriptors for Particle Shape Characterization , 2003 .

[9] B. Stucker,et al. CONTROLLING PHASE COMPOSITION IN SELECTIVE LASER MELTED STAINLESS STEELS , 2012 .