Effect of spiral scan strategy on microstructure for additively manufactured stainless steel 17–4. (August 2021)

• Record Type: Journal Article
• Authors: Yeung, H.; Chen, J.; Yang, G.; Guo, Y.; Lin, D.; Tan, W.; Weaver, J.
• Is Part Of: Manufacturing letters. Volume 29(2021)
• Page Start: 1
• Page End: 4
• Publication Date: 2021-08
• Subjects: Additive manufacturing -- Scan strategies -- Microstructure -- Hardness; Manufacturing industries -- Periodicals; Production engineering -- Periodicals; Manufacturing industries; Periodicals; 670
• DOI: 10.1016/j.mfglet.2021.04.005
• Languages: English
• ISSNs: 2213-8463

Abstract

Abstract: The effect of the scan strategy on microstructure is investigated using a custom-built laser powder bed fusion additive manufacturing testbed. Eight stainless steel cubic parts were built to compare two different scan strategies: raster and spiral. The processes were monitored in-situ by a high-speed camera coaxially aligned to the heating laser, and the parts built were characterized by micro-indentation and optical microscopy. The spiral scan strategy creates a much larger meltpool area and the resulting parts exhibit an equiaxed grain structure with 54% higher hardness value compared to the raster scan strategy.