Microstructure evolution during laser direct energy deposition of a novel Fe-Cr-Ni-W-B hardfacing coating

Cakmak, Ercan; Dehoff, Ryan R.

doi:10.1016/j.surfcoat.2018.09.053

Cited by 11 publications

(1 citation statement)

References 28 publications

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“…Particular variants of the DED process have been denoted in several ways in the literature such as: Direct Metal Deposition (DMD), 3D laser cladding, Laser Metal Deposition (LMD) and Direct Laser Deposition (DLD) to name a few. It has been used for various applications such as the manufacturing of complex or graded parts [7], for the deposition of coatings [8] or as a repairing technique [9] The well known AISI 316L stainless steel is a suitable material for AM due to its welding capacity, its relatively high mechanical properties and for its high-temperature performance. In the last decade meaningful efforts were deployed by various groups to investigate the AM process for this steel and its inherent special mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Digital image correlation for microstructural analysis of deformation pattern in additively manufactured 316L thin walls

Balit

Charkaluk

Constantinescu

2020

Additive Manufacturing

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In additive manufacturing, the process parameters have a direct impact on the microstructure of the material and consequently on the mechanical properties of the manufactured parts. The purpose of this paper is to explore this relation by characterizing the local microstructural response via in situ tensile test under a scanning electron microscope (SEM) combined with high resolution digital image correlation (HR-DIC) and electron backscatter diffraction (EBSD) maps. The specimens under scrutiny were extracted from bidirectionally-printed single-track thickness 316L stainless steel walls built by directed energy deposition. The morphologic and crystallographic textures of the grains were characterized by statistical analysis and associated with the particular heat flow pattern of the process. Grains were sorted according to their size into large columnar grains located within the printed layer and small equiaxed grains located at the interfaces between successive layers. In situ tensile experiments were performed with a loading direction either perpendicular or along the printing direction and exhibit different mechanisms of deformation. A statistical analysis of the average deformation per grain indicates that for a tensile loading along the building direction, small grains deform less than the large ones. In addition, HR-DIC combined with EBSD maps showed strain localization situated at the interface between layers in the absence of small grains either individual or in clusters. For tensile loads along the printing direction, the strain localization was present

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Section: Introductionmentioning

confidence: 99%