Studies of thermal distortion and residual stresses of an Inconel 718 part fabricated by the laser powder deposition process

Huan Qi, Byungwoo Lee, Yan Gao, Magdi Azer

Research output: Contribution to conferencePaperpeer-review

Abstract

Laser powder deposition is essentially a thermal process involving rapid phase changes and high temperature gradients. Thermal stresses generated during rapid cooling have critical impacts on the geometric accuracy and material properties of a laser deposited part. Thermal control is critical for obtaining consistent deposition conditions and in limiting thermal deformation and stress induced cracking during the deposition process. In this work, thin-walled Inconel 718 parts were fabricated by laser powder deposition with different laser energy inputs and cylindrical wall curvatures similar to the aeroengine compressor blade geometries. The asdeposited parts were scanned by a CMM laser probe in order to examine the distortions of these parts. Residual stresses on the thin-walled parts were measured by the X-ray diffraction method in a transmission mode. Measurement results show that no significant distortions in the laser deposited thin-walled samples were detected. For single row deposition, residual stresses increases with linear energy input. Curved walls are found to have reduced residual stresses than the flat walls. Tensile stresses are only found in the build up direction at the edges of the flat thin-walled parts.

Original languageEnglish (US)
Pages782-788
Number of pages7
DOIs
StatePublished - 2008
Externally publishedYes
EventICALEO 2008 - 27th International Congress on Applications of Lasers and Electro-Optics - Temecula, CA, United States
Duration: Oct 20 2008Oct 23 2008

Other

OtherICALEO 2008 - 27th International Congress on Applications of Lasers and Electro-Optics
CountryUnited States
CityTemecula, CA
Period10/20/0810/23/08

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

Fingerprint Dive into the research topics of 'Studies of thermal distortion and residual stresses of an Inconel 718 part fabricated by the laser powder deposition process'. Together they form a unique fingerprint.

Cite this