Preliminary Investigation on SLM of ASTM A131 EH36 High Tensile Strength Steel for Shipbuilding Applications
In this preliminary investigation of selective laser melting (SLM) of EH36 high tensile strength steel, a 175 W Yb:YAG laser in continuous wave mode was used to produce EH36 test specimens. The laser beam profile follows the Gaussian distribution and has a wavelength of 1.064 nm, with a focaldiamete...
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Main Authors: | , , , , , |
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Other Authors: | |
Format: | Conference or Workshop Item |
Language: | English |
Published: |
2016
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Subjects: | |
Online Access: | https://hdl.handle.net/10356/84206 http://hdl.handle.net/10220/41695 |
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Institution: | Nanyang Technological University |
Language: | English |
Summary: | In this preliminary investigation of selective laser melting (SLM) of EH36 high tensile strength steel, a 175 W Yb:YAG laser in continuous wave mode was used to produce EH36 test specimens. The laser beam profile follows the Gaussian distribution and has a wavelength of 1.064 nm, with a focaldiameter of 81 µm. The powder layer thickness was set at 50 µm. The stainless steel substrate plate was preheated to 100 °C. The scanning speeds were varied from 260 mm/s to 880 mm/s, and hatch spacing were varied from 0.08 mm to 0.12 mm, to obtain the various energy densities. The highest density value of 7.64 g/cm3 was obtained at an energy density of 92 J/mm3 using parameters of 0.12 mm hatch spacing, powder at 175W, 50 mm layer thickness and 320 mm/s laser scanning speed. Compared to the relative density of the compacted supplied powder (7.83 g/cm3), the results translated to 97.57% fully dense part. Micrographs were obtained using light optical microscopy, which showed slight porosities in the SLM built part. X-ray diffraction and scanning electron microscropy revealed BCC phases and martensitic microstructure respectively. |
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