Skip to main content    

An official website of the United States government

Here’s how you know

**Official websites use .gov**              A **.gov** website belongs to an official government organization in the United States.            

**Secure .gov websites use HTTPS**              A **lock** (  LockA locked padlock) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.            

https://www.nist.gov/ambench/chal-amb2018-02-mp-length

            -  Topics  -  All Topics 
-  Advanced communications 
-  Artificial intelligence 
-  Bioscience 
-  Buildings and construction 
-  Chemistry 
-  Climate 
-  Cybersecurity 
-  Electronics 
-  Energy 
-  Environment 
-  Fire 
-  Forensic science 
-  Health 
-  Information technology 
-  Infrastructure 
-  Manufacturing 
-  Materials 
-  Mathematics and statistics 
-  Metrology 
-  Nanotechnology 
-  Neutron research 
-  Performance excellence 
-  Physics 
-  Public safety 
-  Resilience 
-  Standards 
-  Transportation 
 
            -  Publications 
            -  Labs & Major Programs  -  Laboratories    -  Communications Technology Laboratory 
  -  Engineering Laboratory 
  -  Information Technology Laboratory 
  -  Material Measurement Laboratory 
  -  Physical Measurement Laboratory 
-  User Facilities    -  NIST Center for Neutron Research 
  -  CNST NanoFab 
-  Research Test Beds 
-  Research Projects 
-  Tools & Instruments 
-  Major Programs    -  Baldrige Performance Excellence Program 
  -  CHIPS for America Initiative 
  -  Manufacturing Extension Partnership (MEP) 
  -  Office of Advanced Manufacturing 
  -  Special Programs Office 
  -  Technology Partnerships Office 
 
            -  Services & Resources  -  Standards and Measurements    -  Calibration Services 
  -  Laboratory Accreditation (NVLAP) 
  -  Quality System 
  -  Standard Reference Materials (SRMs) 
  -  Standards.gov 
  -  Time Services 
  -  Office of Weights and Measures 
-  Software 
-  Data    -  Chemistry WebBook 
  -  National Vulnerability Database 
  -  Physical Reference Data 
  -  Standard Reference Data (SRD) 
-  Storefront 
-  License & Patents 
-  Computer Security Resource Center (CSRC) 
-  NIST Research Library 
 
            -  News & Events  -  News 
-  Events 
-  Blogs 
-  Feature Stories 
-  Awards 
-  Video Gallery 
-  Image Gallery 
-  Media Contacts 
 
            -  About NIST  -  About Us    -  Leadership 
  -  Organization Structure 
  -  Budget & Planning 
-  Contact Us 
-  Visit 
-  Careers    -  Student programs 
-  Work with NIST 
-  History    -  NIST Digital Archives 
  -  NIST Museum 
  -  NIST and the Nobel 
-  Educational Resources 
 

## Additive Manufacturing Benchmark Test Series (AM-Bench)

-  AM Bench Data and Challenge Problems 
-  Example Model Comparisons 
-  Conferences and Meetings 
-  Schedule 
-  Completed Challenge Problem Submissions and Awards 
-  Organization 
-  Customers/ Beneficiaries 
-  How to Get Involved 

# CHAL-AMB2018-02-MP-Length

## Share

Facebook

Linkedin

Twitter

Email

### **Results Description for CHAL-AMB2018-02-MP: Melt Pool Geometry - Length**

**1. Overview of Results**

The following tables and associated links summarize the data to be used for CHAL-AMB2018-02-MP: Melt Pool Geometry - Melt Pool Length on the commercial build machine (CBM) and Additive Manufacturing Metrology Testbed (AMMT) using in-situ thermographic methods.  Melt pool width (CHAL-AMB2018-02-MP: Melt Pool Geometry-Width), measured ex-situ via confocal microscopy, can be found here.

**Note 1:** The ex-situ measurements for AMB2018-02, including topography, grain shapes, and structure were made on the samples fabricated on the AMMT.  Ex-situ measurements on the CBM samples will be provided at a later time.

**Note 2:**  Laser power calibration on the AMMT was found erroneous after the single tracks were fabricated.  A commanded power of 150 W resulted in true power of 137.9 W, and commanded power of 195 W resulted in 179.2 W.  The true laser power on the AMMT which fabricated the test samples is noted in the tables.

**Note 3:** It is understood by the authors that the melt pool length measurements differs significantly between the CBM and AMMT measurement systems, despite great effort to ensure experiment parameters and controls for both systems were as similar as possible.  Additional validation experiments were conducted to deduce any potential experiment setup or measurement error.   At the time of publication (5/18/2018), the source of discrepancy is yet undetermined.  Despite this, the authors felt that openly presenting and acknowledging this discrepancy is of greater scientific value than withholding results from one or both experiments.  Discussion of this discrepancy will be provided at the 2018 AM-Bench conference, further updates to this site, and further investigations or publications.

----

**2. Melt Pool Geometry – Length**

Table 1 provides melt pool length values determined from in-situ thermographic measurements on the commercial build machine (CBM).  Melt pool length is calculated using the method defined in 3.1 of the AMB2018-02 test description.  Associated temperature profiles, measurement details, additional results of interest can be found here.

Table 1: CHAL-AMB2018-02-MP: Melt Pool Geometry-Melt Pool Length measured on the CBM.

Table 2 provides melt pool length values determined from in-situ thermographic measurements on the AMMT.  Associated temperature profiles, measurement details, additional results of interest can be found here.

Table 2: CHAL-AMB2018-02-CR: Melt Pool Geometry-Melt Pool Length measured on the AMMT.

Additive manufacturing

## Contacts

                -  Lyle E. Levine  lyle.levine@nist.gov      (301) 975-6032   
                -  Brandon Lane  brandon.lane@nist.gov      (301) 975-5471   

### HEADQUARTERS

301-975-2000

Webmaster | Contact Us | Our Other Offices

TwitterFacebookLinkedInInstagramYouTubeGiphyRSS FeedMailing List

Feedback

            -  Site Privacy 
            -  Accessibility 
            -  Privacy Program 
            -  Copyrights 
            -  Vulnerability Disclosure 
            -  No Fear Act Policy 
            -  FOIA 
            -  Environmental Policy 
            -  Scientific Integrity 
            -  Information Quality Standards 
            -  Commerce.gov 
            -  Science.gov 
            -  USA.gov 
            -  Vote.gov