Abstract
Curvature effects are typically present in the process of additive manufacturing (AM), particularly for wire arc additive manufacturing. In this paper, stainless-steel wire was adopted to deposit thin-walled samples with different curvatures. Optical microscopy, SEM, EDS and micro-hardness was used to analyse the microstructure, composition and properties of the samples. The result shows that the bottom region of the thin-walled sample had a mainly planar and cellular crystal microstructure. For the middle region, the microstructure revealed mainly dendrites, and the top layer has equiaxed dendrite morphology. The microhardness value of the bottom was greater than that of the middle, and the microhardness value of the middle was greater than that of the top. Moreover, the grain size of the inner part (direct to curvature radius) was larger than that of the outer part, and the micro-hardness value exhibited an increasing tendency from the inner to the outer side. With enlarging curvature, the degree of grain size differences and micro-hardness variants decreased. Finally, an investigation with a low carbon steel wire showed that it had a similar curvature effect for its AM specimen.
Highlights
Additive manufacturing (AM), known as rapid forming technology, was proposed by CharlesW
In industrialized applications of wire arc additive manufacturing (WAAM) technology, it is valuable to understand the influence of the arc thermal effect on the microstructure and performance of different zones of the formed parts
It can be seen that the beadFigure surface4was smooth, and thesample overlapproduced fusion between the stainless-steel welds was sound, collapse
Summary
Additive manufacturing (AM), known as rapid forming technology, was proposed by Charles. In industrialized applications of WAAM technology, it is valuable to understand the influence of the arc thermal effect on the microstructure and performance of different zones of the formed parts. The studied the effect of an external field onsubsequent the microstructure and mechanical properties accumulation during the forming process has different effects on the microstructure and of shapedheat specimens. Studied thermal between history, microstructure and properties of formed parts For in different locations, showing that or high in performance the inside and outside of the curve. 304 stainless-steel wire arc additive manufacturing process. Table 1) was the same as the stainless-steel welding wire, in terms of deposited layers. Some single-layer single-pass weld shapes with various process different technological parameters.
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