Effects of Y2O3 nanoparticles on the high-temperature oxidation behavior of IN738LC manufactured by laser powder bed fusion

• Published in: Corrosion science 2020-07, Vol.171, p.108715, Article 108715
• Main Authors: Guo, Chuan, Yu, Zhengrong, Liu, Chang, Li, Xinggang, Zhu, Qiang, Mark Ward, R.
• Format: Article
• Language: English
• Subjects: Corrosion resistance; Corrosion resistant alloys; Cubes; High temperature; High-temperature oxidation; Laser powder bed fusion; Nanoparticles; Nickel-based superalloy; Oxidation; Oxidation tests; Powder beds; Scale (corrosion); Yttria; Yttrium oxide
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2020.108715

•Different contents of Y2O3 are added into IN738LC by laser powder bed fusion.•0.05 % Y2O3 can improve the high-temperature oxidation resistance of IN738LC.•The grains are coarsened apparently by the addition of Y2O3 in the microstructure.•The addition of Y2O3 can change the element distribution in the oxide scale.•The oxidation behavior of IN738LC doped with Y2O3 is affected by many factors. Oxidation tests at 1095 °C were performed on cubes of IN738LC doped with Y2O3 nanoparticles processed by laser powder bed fusion (LPBF). Adding Y2O3 nanoparticles led to grain coarsening and the formation of Y4Al2O9, both of which were expected to lead to reduced corrosion resistance in this alloy through a change from an Al-type oxide scale to Cr-type. However, 0.05 wt% Y2O3 addition was found to nonetheless be beneficial for corrosion resistance. Results and mechanisms for this were discussed and further work was recommended, in particular for the grain coarsening.