Session: MF-16-01 Creep and Creep-Fatigue Interaction

Paper Number: 84784

84784 - Creep Crack Growth Testing on 316l Steel Manufactured by Laser Powder Bed Fusion 

Additive manufacturing (AM) is a relatively new idea that creates complex metal components in successive layers. This particular process has multiple benefits within the manufacturing industry including reduced geometric limitations; enhanced material economy; reduced manufacturing variability and a reduced manufacturing footprint. However, during the AM process, there are a number of issues including the development of high residual stresses and variations in microstructure.  

 

To date, no creep crack growth tests have been published on 316L Laser Powder Bed Fusion  (LPBF) material though it is a candidate material for high temperature and nuclear applications. LPBF material is known to contain crack like defects and residual stresses, hence it is likely that these defects could grow by creep processes. Hence it is important that the creep crack growth (CCG) behaviour of LPBF material is characterised. Hence the main aim of this work is to perform and analyse CCG.   Recently, a novel method has been developed to analyse the CCG data. This method requires finite element analyses to be performed to simulate the CCG test. Hence, finite element (FE) models will be required to analyse the data. In addition, time allowing, the residual stress distribution in the CT specimen will be quantified by FE analysis.  

Presenting Author: Catrin Davies Imperial College London

Presenting Author Biography: Reader in structural integrity of alloys at Imperial college london

Authors:

Jorge De Andres Imperial College London
Vignesh Sriram imperial college london
Catrin Davies Imperial College London