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Thermal expansion coefficients in Invar processed by selective laser melting

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Figure

Figure 1 Schematic demonstrating build orientation of tensileas test orientations for thermal expansion analysis (component cuboids (a) and thermal expansion cubes (b), as wellc).
Figure 3 aporosity in 99.96% dense, b[99.5% dense, c example of lack of fusion porosity in\99.5% dense sample, d example of vapourisation \99.5% dense sample
Figure 4 Optical micrograph of etched sample—note highlydirectional columnar grains highlighted by dashed lines
Figure 6 Normalised thermal expansion for x-y and z testorientations of SLM as-deposited stainless steel 316 and HastelloyX, with Invar curves added for comparison

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