研究目的
To study the mechanical response of Inconel 718 repaired thin walls, focusing on the interface between base material and repaired area, and to observe the multiaxial strain patterns until failure at the grain level.
研究成果
The study highlights that components repaired using Laser Cladding exhibit a particular microstructure with a pronounced gradient from small equiaxed grains to large textured columnar grains. This gradient induces a multiaxial heterogeneous mechanical response, with strain localization mainly due to grain size effect. Future work will explore the high cycle response and assess the fatigue lifetime of repaired components.
研究不足
The study focuses on the mechanical response at the grain level in repaired microstructures, but the high cycle response and fatigue lifetime of repaired components are not explored in this work.
1：Experimental Design and Method Selection:
The study involves EBSD imaging and in-situ SEM tensile tests on specimens containing the interface between base material and repaired area. A Digital Image Correlation method is used to observe multiaxial strain patterns.
2：Sample Selection and Data Sources:
The substrate is a plate of 1.6 mm thick made of wrought Inconel 718, with a single-bead wall deposited by Laser Cladding.
3：6 mm thick made of wrought Inconel 718, with a single-bead wall deposited by Laser Cladding.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: FEI Quanta 600 FEG-ESEM for SEM and EBSD analysis, Gatan PECS II for ion polishing, and a Laser Cladding BeAM Mobile machine for sample preparation.
4：Experimental Procedures and Operational Workflow:
Samples were mechanically polished, ion polished, and then subjected to EBSD analysis and in-situ tensile tests. A gold grid was deposited for DIC.
5：Data Analysis Methods:
Strain maps were obtained using the home-made DIC software CMV and superimposed on the microstructure images from the EBSD using a Matlab code.
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