Session: MF-04-01 European Programs in Structural Integrity-NUCOBAM Project

Paper Number: 123296

123296 - Fatigue Behavior in Air of 316l Stainless Steel Obtained by Additive Manufacturing in the Frame of the Nucobam European Project. 

Additive Manufacturing (AM) opens new opportunities for the nuclear industry by reducing manufacturing costs for complex geometries compared to traditional manufacturing methods. Nevertheless, it should be verified that components obtained by AM meet the performances needed regarding safety-related function and operational requirements as the usual materials used in the nuclear industry. NUCOBAM (Nuclear Components Based on Additive Manufacturing) European project aims at developing a methodology to qualify components produced via AM. Laser Powder Bed Fusion and the austenitic stainless steel 316L are the AM method and the material under study for this project.

One of the major mechanical degradation mechanisms undergone by nuclear materials is fatigue. Therefore, one of the key points of NUCOBAM’s material characterization program is the low cycle fatigue behavior in air of the AM processed 316L. A complete test matrix has been designed including several strain amplitudes between 0.2% and 1% and test temperatures (room temperature or 300°C). The other parameters under study are the machining direction (resulting in z-oriented or x-oriented specimens), the porosity ratio, the grain structure, the specimen post processing heat treatment and the thermal ageing heat treatment. This paper aims at giving an overview of the fatigue test program results and discuss them in the light of microstructural characterizations. A comparison of the fatigue mean curve from NUREG/CR-6909 rev1 obtained for wrought stainless steel is discussed. 

This study was performed on behalf of the NUCOBAM European project that received funding from the Euratom 2014-2018 under grant agreement No 945313.

Presenting Author: Jonathan Quibel Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES/SEREX/LE2M

Presenting Author Biography: Researcher in Materials Science, I did a PhD on corrosion fatigue of composites in the frame of a collaboration between the company Michelin and two french laboratories : MatéIS (Lyon) and LMPS (Paris).
Since, I work at the French Radioprotection and Nuclear Safety Institute (IRSN) on environmentally assisted fatigue and stress corrosion cracking.

Authors:

Séverine Guilbert Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES/SEREX/LE2M
Luc Doremus FRAMATOME Technical Center
Walter-John Chitty Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES/SEREX/LE2M
Alexandre Hermant Naval Group Technocampus Océan
Jonathan Quibel Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES/SEREX/LE2M