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Abstract
The effect of grain orientation on hot cracking susceptibility of selective laser additive manufactured Alloy 718 was investigated by Varestraint testing. Electron backscattered diffraction showed that cracks in heat affected zone (HAZ) of the welded samples occurred in high angle grain boundaries. The extent of HAZ cracking was smaller in samples tested parallel to the elongated grain orientation and larger in samples transverse to the elongated grain orientation. However, for solidification cracking in the weld metal, no significant difference with respect to grain orientation in the base metal was found.
Highlights
Significant attention has been drawn to additive manufacturing (AM), which is a unique manufacturing process that allows for parts of various complexity to be built layer-by-layer [1]
The results showed that the cracks in heat affected zone (HAZ) were, to a large extent, following the vertical grain boundaries i.e. parallel to the building direction in the as-built welded samples
Selective laser melted Alloy 718, manufactured in two different building directions, has been investigated by Varestraint weldability testing method in order to understand the influence of grain orientation on hot cracking susceptibility
Summary
Significant attention has been drawn to additive manufacturing (AM), which is a unique manufacturing process that allows for parts of various complexity to be built layer-by-layer [1]. Selective Laser Melting (SLM) is a conventional Laser-Powder Bed Fusion (L-PBF). Process that involves melting of a thin layer of metallic powder on a substrate plate and moving a focused laser in a specified pattern along the powder bed. The laser irradiated powder melts forming a micro-sized melt pool. The melt pool rapidly solidifies upon the removal of the laser and individual tracks of solid material forms. The sum of individual tracks within a plane forms a layer. A layer of powder is again applied on the solidified layer and the laser scans the powder to build the layer
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