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Mechanical Behavior Characterization of a Stainless Steel Dissimilar Metal Weld Interface : In-situ Micro-Tensile Testing on Carburized Martensite and Austenite

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Abstract

Background

Stainless Steel Dissimilar Metal Welds (SS DMW) between low-alloy steel 18MND5 and austenitic 316L stainless steel are critical junctions in the currently operating reactors because of their heterogeneous microstructure and mechanical properties. The presence of a narrow hard layer of carburized martensite and austenite in the ferritic-austenitic interface creates an important hardness gradient which affects the crack behavior of the SS DMW.

Objective

In order to evaluate the plastic properties of this hard layer, a micro tensile testing method was developed.

Methods

Tensile specimens of 15 x 80 x 6 μm were extracted from the martensitic and carburized austenitic layers by focused ion beam (FIB) micro-processing and tested using an in-situ tensile testing device. A platinum FIB deposition was used to measure local strain in the specimen during the test through digital image correlation (DIC). Isotropic elasto-plastic constitutive laws for the martensite and carburized austenite were obtained from the true strain-stress curves calculated from the micro-tensile tests.

Results

It was found that the corresponding plastic properties were in a good agreement with nanoindentation measurements and with values obtained from macroscopic tensile tests on crossweld specimens machined perpendicularly to the ferritic-austenitic interface and characterized using laser beam local diameter measurements.

Conclusions

In-situ tensile testing is a promising technique for plastic behavior characterization of small scale materials and local hard layers in dissimilar metal welds.

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Acknowledgments

This work was carried out within the MATMECA consortium and supported by the ANR under contract number ANR-10-EQPX-37.

The presented study was sponsored by Framatome with the participation of the MSSMat and CEA/LISN laboratories. The authors wish to express their gratitude to all the partners who contributed in this work, especially Olivier Ancelet and Gregory Perez (CEA/LISN) for their help and contribution in the experimental program on the DMW mock-up, Éric Perrin and Frédéric Douit (MSSMat) for their great participation in the in-situ tensile testing machine development and all the Material research team of MSSMat for their helpful advices.

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Authors and Affiliations

  1. FRAMATOME, 1 Pl. Jean Millier, 92400, Courbevoie, France

    G. Ben Salem, S. Chapuliot & A. Blouin

  2. Laboratoire MSSMat, UMR CNRS 8579, CentraleSupelec, 3 Rue Joliot Curie, 91190, Gif-sur-Yvette, France

    G. Ben Salem, E. Héripré & P. Bompard

  3. DEN-Service d ́études mécaniques et thermiques (SEMT), CEA, Université Paris-Saclay, F-91191, Gif-sur-Yvette, France

    G. Ben Salem & C. Jacquemoud

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  1. G. Ben Salem
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Correspondence to G. Ben Salem.

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Ben Salem, G., Héripré, E., Bompard, P. et al. Mechanical Behavior Characterization of a Stainless Steel Dissimilar Metal Weld Interface : In-situ Micro-Tensile Testing on Carburized Martensite and Austenite. Exp Mech 60, 1037–1053 (2020). https://doi.org/10.1007/s11340-020-00633-1

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