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Fatigue Behavior Of Laser Powder Bed Generated 316L Austenitic Steel And Its Sensitivity To The Gas Used During Processing

  • : Markus Schneider1, Simon Höges1, Dennis Wawoczny2
  • : 1GKN Sinter Metals Engineering GmbH, 2University of Wuppertal
  • : PDF Download
  • : 2018

Abstract

The reliability and fatigue performance of Laser Powder Bed (LPB) generated structures and systems are of major interest because their potential usage is often linked to aerospace automotive and other safety-relevant applications. An often-used protection gas during the LPB process is nitrogen. Chromium-rich steels like 316L tend to absorb nitrogen as a function of the chosen gas partial pressure. The formation of chromium nitrides leads to an increased hardness and to a significant embrittlement of the metallic matrix. Bending fatigue experiments with smooth and notched specimens were performed to characterize the mean stress sensitivity the notch sensitivity the scatter in the staircase test domain and the effect of a subsequent hot isostatic pressing operation. The obtained changes in the pore morphology the metallic matrix as well as the differences in the static and cyclic properties are discussed and compared with other published values.

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