Identification of direct metal deposition (DMD) process parameters for manufacturing thin wall structures from shape memory alloy (NiTi) powder

Kostyantyn Malukhin*, Kornel F. Ehmann

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

This paper presents a study on the experimental identification of laser based layer-by-layer Direct Metal Deposition (DMD) process parameters for manufacturing non-porous and non-cracked high quality thin wall structures from Shape Memory Alloy (SMA) NiTi powder. Sixteen thin walls were manufactured following a 23 factorial design of experiments. Three factors, laser power, coolant flow rate through a heat exchanger (heat sink) and powder flow rate were considered. Mechanical and optical profilometers were used to measure the surface roughness of the fabricated walls. A scanning electron microscope (SEM) and an optical microscope were used to estimate the quality of the walls' material: porosity, cracks and interlayer bonding. Statistical analysis has shown that laser power contributes approximately up to 70% to the quality of fabricated material. To validate the identified parameters a more complex 2.5-D high quality thin wall structure - an accordion spring actuator - was manufactured at the end of this study.

Original languageEnglish (US)
Title of host publicationTransactions of the North American Manufacturing Research Institution of SME 2007 - Papers Presented at NAMRC 35
Pages481-488
Number of pages8
StatePublished - Aug 22 2007
Event35th North American Manufacturing Research Conference, NAMRC 35 - Ann Arbor, MI, United States
Duration: May 22 2007May 25 2007

Publication series

NameTransactions of the North American Manufacturing Research Institution of SME
Volume35
ISSN (Print)1047-3025

Other

Other35th North American Manufacturing Research Conference, NAMRC 35
CountryUnited States
CityAnn Arbor, MI
Period5/22/075/25/07

Keywords

  • Direct metal deposition (DMD)
  • Layer-by-layer manufacturing
  • Shape memory alloy (SMA)
  • Thin wall structures

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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  • Cite this

    Malukhin, K., & Ehmann, K. F. (2007). Identification of direct metal deposition (DMD) process parameters for manufacturing thin wall structures from shape memory alloy (NiTi) powder. In Transactions of the North American Manufacturing Research Institution of SME 2007 - Papers Presented at NAMRC 35 (pp. 481-488). (Transactions of the North American Manufacturing Research Institution of SME; Vol. 35).