Influence of increased carbon content on the processability of high-speed steel HS6-5-3-8 by laser powder bed fusion

This work presents high speed thermographic measurements of the melt pool length during single track laser scans on nickel alloy 625 substrates. Scans are made using a commercial laser powder bed fusion machine while measurements of the radiation from the surface are made using a high speed (1800 frames per second) infrared camera. The melt pool length measurement is based on the detection of the liquidus-solidus transition that is evident in the temperature profile. Seven different combinations of programmed laser power (49 W to 195 W) and scan speed (200 mm/s to 800 mm/s) are investigated and numerous replications using a variety of scan lengths (4 mm to 12 mm) are performed. Results show that the melt pool length reaches steady state within 2 mm of the start of each scan. Melt pool length increases with laser power, but its relationship with scan speed is less obvious because there is no significant difference between cases performed at the highest laser power of 195 W. Although keyholing appears to affect the anticipated trends in melt pool length, further research is required.

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In Situ Analysis of Laser Powder Bed Fusion Using Simultaneous High-Speed Infrared and X-ray Imaging

JOM ◽

10.1007/s11837-020-04291-5 ◽

2020 ◽

Vol 73 (1) ◽

pp. 201-211 ◽

Cited By ~ 3

Author(s):

Benjamin Gould ◽

Sarah Wolff ◽

Niranjan Parab ◽

Cang Zhao ◽

Maria Cinta Lorenzo-Martin ◽

...

Keyword(s):

High Speed ◽

In Situ Analysis ◽

Powder Bed Fusion ◽

Laser Powder Bed Fusion ◽

Powder Bed ◽

X Ray ◽

X Ray Imaging

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Probing Ultrafast Dynamics in Laser Powder Bed Fusion Using High-Speed X-Ray Imaging: A Review of Research at the Advanced Photon Source

JOM ◽

10.1007/s11837-020-04015-9 ◽

2020 ◽

Vol 72 (3) ◽

pp. 999-1008 ◽

Cited By ~ 1

Author(s):

Tao Sun

Keyword(s):

High Speed ◽

Ultrafast Dynamics ◽

Powder Bed Fusion ◽

Laser Powder Bed Fusion ◽

Powder Bed ◽

X Ray ◽

X Ray Imaging ◽

Photon Source

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In Situ Thermography During Laser Powder Bed Fusion of a Nickel Superalloy 625 Artifact with Various Overhangs and Supports

Journal of Research of the National Institute of Standards and Technology ◽

10.6028/jres.126.005 ◽

2021 ◽

Vol 126 ◽

Author(s):

Benjamin Molnar ◽

Jarred C. Heigel ◽

Eric Whitenton

Keyword(s):

Cooling Rate ◽

High Speed ◽

Nickel Superalloy ◽

Powder Bed Fusion ◽

Support Structures ◽

Radiance Temperature ◽

Laser Powder Bed Fusion ◽

Powder Bed ◽

Melt Pool

This document provides details on the experiment and associated measurement files available fordownload in the dataset “In Situ Thermography During Laser Powder Bed Fusion of a Nickel Superalloy 625 Artifact with Various Overhangs and Supports.” The measurements were acquired during the fabrication of a small nickel superalloy 625 (IN625) artifact using a commercial laser powder bed fusion (LPBF) system. The artifact consists of two half-arch features with increasing slopes for overhangs. These overhangs range from 5° from vertical to 85° from vertical in increments of 10°. The artifact geometry and process are controlled to ensure consistent processing along the overhang geometry. This control enables the effect of overhang geometry and support structures to be isolated from effects of inter-layer scan strategy variations. The measurements include high-speed thermography of each layer, from which radiance temperature, cooling rate, and melt pool length are calculated.

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