Abstract
• Microstructure and oxidation behaviour of an LPBF fabricated GH3536 superalloy was investigated. • Oxidation resistance is closely related to defect density while micro-cracks significantly impair the oxidation resistance. • Oxidation resistance can be improved by optimising processing parameters and powder composition. This study investigates the formation of defects and their impact on oxidation behaviour of GH3536 superalloys fabricated by laser powder bed fusion (LPBF). Defects of six series of samples manufactured by different parameters is dominated by pores, micro-cracks, and lack of fusion, respectively. The superalloy is isothermally oxidised in 950 °C dry air for 500 h. The oxidation resistance of LPBF GH3536 depends on the types and quantity of processing defects, wherein the sample with micro-cracks as the main defect exhibit the worst oxidation resistance. Electron probe microanalysis of the superalloy revealed the impact of micro-cracks on diffusion process. Defects seriously deteriorate the oxidation resistance, especially micro-crack defects. Reducing manufacturing defects in the samples can improve the corrosion resistance.
Published Version
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