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Results Description for CHAL-AMB2018-02-AMMT-MP: Melt Pool Geometry – Width and Depth



**1. Overview of Results**

Ten laser traces were created in the ground surface of the sample at the NIST Additive Manufacturing Metrology Testbed (AMMT) using three different power and speed settings. The laser scan length for these traces was 16 mm and they were spaced 0.5 mm apart. Figure 1 is a macro photograph of the sample. The power and speed settings used at the AMMT for the laser traces are given in Table 1.

Associated data files for these measurements can be downloaded here.  Files include original microscopy images, summary of measurement results, and documented details on the measurement procedures including sample preparation and measurement procedures.



 
      Macrograph of the AMB2018- 02 AMMT sample prior to examination taken with a Nikon D70 using a 60 mm 1:2.8 D Auto Focus Micro-Nikkor lens with ambient lighting
Figure 1: Macrograph of the AMB2018- 02 AMMT sample prior to examination taken with a Nikon D70 using a 60 mm 1:2.8 D Auto Focus Micro-Nikkor lens with ambient lighting.Table 1: AMMT process parameters for the topography sample



 
      AMMT process parameters for the topography sample**2. Melt Pool Geometry Results Summary**

The sample was cross sectioned through the middle of the laser traces, mounted, and polished using standard procedures.  The width and depth of all 10 traces was measured using the control software for the microscope.   Table 2 shows the mean and standard deviation determined for each melt pool cross section and the mean and standard deviation determined for each speed and power class of laser trace.  Further details on the measurement procedures can be foundhere.

Figure 2 is the stitched 13 x 5 tile composite taken with the 10x objective showing all 10 traces. This figure has been split between traces 5 and 6 to improve the aspect ratio for presentation in this report. This figure was used in subsequent analyses to ensure that the correct trace was being examined at all times.  High resolution bright and dark-field images of each cross-section can be downloaded here.



Trace 1
			Trace 6Trace 2
			Trace 7Trace 3
			Trace 8Trace 4
			Trace 9Trace 5
			Trace 10





 
      Metallographic cross section 8 x 4 tile composite showing all ten traces as observed in the reflected light bright field mode
Figure 2: Metallographic cross section 8 x 4 tile composite showing all ten traces as observed in the reflected light bright field modeTable 2: Results of melt pool measurements using the metrology mode of the microscope control, image acquisition, and analysis software using the metrology mode. The uncertainty in the individual measurements is estimated at 0.5 μm and the average for the class type is an indicator of the stochastic variability of the process.

Melt Pool Width, μm
			Melt Pool Depth, μm
			Class Width, μm
			Class Depth, μmCase ID
			Trace No.
			Mean
			Std Dev
			Mean
			Std Dev
			Mean Width
			Std. Dev.
			Mean Depth
			Std. Dev.C
			1
			104.4
			0.187
			29
			0.081
			106
			1.4
			29.6
			0.62
			107.7
			0.187
			29.2
			0.0413
			106.6
			0.071
			30
			04
			105.4
			0.216
			30.2
			0.148A
			5
			144
			0.32
			44.4
			0.122
			147.9
			3.7
			42.5
			1.76
			151.3
			0.071
			41
			0.1877
			148.5
			0.357
			42.1
			0.108B
			8
			116.4
			0.187
			38.2
			0.179
			123.5
			6.5
			36
			1.99
			129.1
			0.142
			34.8
			0.04110
			124.9
			0.204
			34.9
			0.147
  Additive manufacturing

    
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Lyle E. Levine
    
      
  lyle.levine@nist.gov
  (301) 975-6032

  Brandon Lane
    
      
  brandon.lane@nist.gov
  (301) 975-5471

Created May 30, 2018, Updated July 21, 2023
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