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Lecture

WEB Mechanical properties and residual stresses of additively manufactured copper components tested via instrumented indentation testing

Thursday (24.09.2020)
10:25 - 10:40 S: Structural Materials 1
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The research focuses on alloy design, powder production and laser powder bed fusion (L-PBF) of copper alloys. Copper and its alloys play a fundamental role for modern industrial applications due to their excellent thermal and electric conductivity in conjunction with considerable mechanical strength, for example, as welding electrodes and nozzles. By precipitation hardening, the hardness and strength of low-alloyed copper, like CuCr1Zr and CuNiCrSi as objectives of the present work, can be increased significantly. A combination of the geometry freedom of additive manufacturing with a tailor-made alloy design during powder production offers the opportunity to develop new alloy systems with a focus on the respective application.

One of the problems correlated with L-PBF is the occurrence of residual stresses of the built components established during the manufacturing process. The origin of residual stresses is based on the rapid and cyclic heating with following cooling process, resulting in a distortion of the parts during the manufacturing process. One opportunity to measure such stresses in combination with the mechanical properties of the material is the use of the instrumented indentation testing. The main purpose of this test is the illustration of the indentation force as a function of the indentation path and force. Components that exhibit residual stresses have a different slope of the indentation force vs. depth curve as compared to stress-free components. Based on the different way of the indentation force vs. the indentation path, the residual stresses of additive manufactured components can be quantified.

 

Speaker:
Heinrich von Lintel
Hochschule Osnabrück
Additional Authors:
  • Dr. Katrin Jahns
    Hochschule Osnabrück; KME Germany GmbH & Co. KG
  • Dr. Peter Böhlke
    KME Germany GmbH & Co. KG
  • Prof. Dr. Ulrich Krupp
    RWTH Aachen University